Buick Enclave: Specifications, Diagnostic Information and Procedures

SPECIFICATIONS

FASTENER TIGHTENING SPECIFICATIONS

Fastener Tightening Specifications

SCHEMATIC WIRING DIAGRAMS

ANTI-LOCK BRAKE SYSTEM WIRING SCHEMATICS

Power, Ground, Serial Data and Traction Control

Fig. 1: Power, Ground, Serial Data and Traction Control Wiring Schematics

Wheel Speed Sensors

Fig. 2: Wheel Speed Sensors Wiring Schematics

Stability Control

Fig. 3: Stability Control Wiring Schematics

DIAGNOSTIC INFORMATION AND PROCEDURES

DIAGNOSTIC CODE INDEX

DTC C0035-C0050: WHEEL SPEED SENSOR

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0035 00

• Left Front Wheel Speed Sensor Circuit

DTC C0035 5A

• Left Front Wheel Speed Sensor Circuit Plausibility Failure

DTC C0040 00

• Right Front Wheel Speed Sensor Circuit

DTC C0040 5A

• Right Front Wheel Speed Sensor Circuit Plausibility Failure

DTC C0045 00

• Left Rear Wheel Speed Sensor Circuit

DTC C0045 5A

• Left Rear Wheel Speed Sensor Circuit Plausibility Failure

DTC C0050 00

• Right Rear Wheel Speed Sensor Circuit

DTC C0050 5A

• Right Rear Wheel Speed Sensor Circuit Plausibility Failure

Diagnostic Fault Information

Mechanical Fault Table

Circuit/System Description

The wheel speed sensor receives ignition voltage from the electronic brake control module (EBCM) and provides a DC square wave signal back to the module. As the wheel spins, the EBCM uses the frequency of the square wave signal to calculate the wheel speed.

Conditions for Running the DTC

C0035 00-C0050 00

• Ignition ON.
• Ignition voltage is greater than 9.5 V.

C0035 5A-C0050 5A

• Ignition ON.
• Ignition voltage is greater than 9.5 V.
• The brake pedal is not pressed.
• A DTC is not set for the other wheel speed sensor on the same axle.

Conditions for Setting the DTC

C0035 00-C0050 00

• A missing wheel speed sensor signal.
• Wheel speed sensor power supply is less than 7.6 V.
• A short to voltage, short to ground or an open/high resistance is detected on the signal circuit.
• A short to ground or an open/high resistance is detected on the wheel speed sensor 12 V reference circuit.

C0035 5A-C0050 5A

An erratic signal output of the wheel speed sensor is detected.

Actions Taken when the DTC Sets

• The ABS indicator illuminates.
• The Stability indicator illuminates.
• The EBCM disables the voltage to the wheel speed sensor the fault is detected on.
• The EBCM disables the ABS, the traction control system and the vehicle stability enhancement system for the duration of the ignition cycle.

Conditions for Clearing the DTC

• The condition for the DTC is no longer present.
• The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

NOTE: During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stability indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stability indicators are ON with no DTCs set, perform the following steps:

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP) and wait 60 seconds.

2. Ignition ON, if the ABS, Traction Control and/or Stability indicators are still illuminated, operate the vehicle at speeds greater than 16 km/h (10 MPH) to complete the self test. The EBCM should request all indicators to turn OFF.

3. If the indicators remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.

4. Operate the vehicle at speeds greater than 40 km/h (25 MPH), the EBCM should request all indicators to turn OFF.

Diagnostic Aids

• Do not use a magnet to clean the encoder ring.
• Inspect the wheel hub bearing encoder ring for rust or corrosion.
• If two or more wheel speed sensors are inoperative, diagnose each wheel speed sensor individually.
• If any of the symptom codes 0F, 18 or 5A are set, refer to the Diagnostic Fault Information table for possible mechanical faults or conditions.
• If the customer comments that the ABS indicator is ON only during moist environmental conditions (rain, snow, vehicle wash, etc.), inspect the wheel speed sensor wiring for signs of water intrusion.

Reference Information

Schematic Reference

Anti-lock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Observe the scan tool Wheel Speed Sensor parameter. The reading should be the same speed on all sensors when driving in a straight line at a speed greater than 20 km/h (13 MPH).

Circuit/System Testing

NOTE: If any of the symptom codes 0F, 18 or 5A are set, refer to the Diagnostic Fault Information table for possible mechanical faults or conditions.

1. Ignition OFF, disconnect the harness connector at the EBCM.

2. Ignition ON, test for less than 1 V between the 12 V reference circuit terminal of the appropriate sensor listed below and ground.

• Left front sensor circuit terminal 21
• Right front sensor circuit terminal 18
• Left rear sensor circuit terminal 33
• Right rear sensor circuit terminal 19
• If greater than the specified range, test the 12 V reference circuit for a short to voltage.

3. Test for less than 1 V between the signal circuit terminal of the appropriate sensor listed below and ground.

• Left front sensor circuit terminal 34
• Right front sensor circuit terminal 6
• Left rear sensor circuit terminal 20
• Right rear sensor circuit terminal 31
• If greater than the specified range, test the signal circuit for a short to voltage.

4. Ignition OFF, test for infinite resistance between the 12 V reference terminal of the appropriate sensor circuit listed below and ground.

• Left front sensor circuit terminal 21
• Right front sensor circuit terminal 18
• Left rear sensor circuit terminal 33
• Right rear sensor circuit terminal 19
• If less than the specified value, test the 12 V reference circuit for a short to ground.

5. Test for infinite resistance between the following signal circuit terminal of the appropriate sensor circuit listed below and ground.

• Left front sensor circuit terminal 34
• Right front sensor circuit terminal 6
• Left rear sensor circuit terminal 20
• Right rear sensor circuit terminal 31
• If less than the specified value, test the signal circuit for a short to ground.

6. Ignition OFF, disconnect the harness connector at the appropriate wheel speed sensor.

7. Test for less than 2 ohms between the appropriate 12 V reference circuit terminals listed below.

• Left front sensor circuit terminal 21 at the EBCM harness connector and terminal 1 at the wheel speed sensor harness connector
• Right front sensor circuit terminal 18 at the EBCM harness connector and terminal 1 at the wheel speed sensor harness connector
• Left rear sensor circuit terminal 33 at the EBCM harness connector and terminal 1 at the wheel speed sensor harness connector
• Right rear sensor circuit terminal 19 at the EBCM harness connector and terminal 1 at the wheel speed sensor harness connector
• If greater than the specified range, test the 12 V reference circuit for an open or high resistance.

8. Test for less than 2 ohms between the appropriate signal circuit terminals listed below.

• Left front sensor circuit terminal 34 at the EBCM harness connector and terminal 2 at the wheel speed sensor harness connector
• Right front sensor circuit terminal 6 at the EBCM harness connector and terminal 2 at the wheel speed sensor harness connector
• Left rear sensor circuit terminal 20 at the EBCM harness connector and terminal 2 at the wheel speed sensor harness connector
• Right rear sensor circuit terminal 31 at the EBCM harness connector and terminal 2 at the wheel speed sensor harness connector
• If greater than the specified range, test the signal circuit for an open or high resistance.

9. If all circuits test normal, replace the appropriate wheel speed sensor. If the DTC resets replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Front Wheel Speed Sensor Replacement
• Rear Wheel Speed Sensor Replacement
• Control Module References for EBCM replacement, programming and setup

DTC C0110: PUMP MOTOR CIRCUIT

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC C0110 00

• Pump Motor Circuit

Diagnostic Fault Information

Circuit/System Description

The pump motor is an integral part of the brake pressure modulator valve, while the pump motor relay is integral to the electronic brake control module (EBCM). The pump motor relay is not engaged during normal system operation. When the ABS, the traction control system or the stability control operation is required the EBCM activates the pump motor relay and turns the pump motor ON.

Conditions for Running the DTC

• Ignition is ON.
• Initialization is complete.

Conditions for Setting the DTC

• The EBCM detects the pump motor runs continuously.
• The EBCM detects the pump motor is binding or stalled.
• The EBCM detects an open/high resistance on the ground circuit.
• The EBCM detects a short to ground or an open/high resistance on the B+ circuit.

Action Taken When the DTC Sets

• The ABS indicator illuminates.
• The red brake indicator illuminates.
• The stability control indicator illuminates.
• The driver information center displays All Wheel Drive OFF, Service StabiliTrak and Service Traction Control messages.
• The EBCM disables the ABS, the traction control system and the vehicle stability enhancement system for the duration of the ignition cycle.

Conditions for Clearing the DTC

• The condition for the DTC is no longer present.
• The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

NOTE: During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stability indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stability indicators are ON with no DTCs set, perform the following steps:

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP) and wait 60 seconds.

2. Ignition ON, if the ABS, Traction Control and/or Stability indicators are still illuminated, operate the vehicle at speeds greater than 16 km/h (10 MPH) to complete the self test. The EBCM should request all indicators to turn OFF.

3. If the indicators remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.

4. Operate the vehicle at speeds greater than 40 km/h (25 MPH), the EBCM should request all indicators to turn OFF.

Reference Information

Schematic Reference

Anti-lock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit Verification

Ignition ON, perform the Pump Motor Test with a scan tool and listen/feel the Pump Motor turn ON and OFF.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the EBCM.

2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 ohms between the ground circuits listed below and ground:

• Terminal 13
• Terminal 38
• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the B+ circuits listed below and ground.

• Terminal 1
• Terminal 25
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the brake pressure modulator valve.

4. If all circuits test normal, replace the brake pressure modulator valve.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Brake Pressure Modulator Valve Replacement
• Control Module References for EBCM replacement, programming and setup

DTC C0131: PRESSURE CIRCUIT PLAUSIBILITY FAILURE

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0131 5A

• Pressure Circuit Plausibility Failure

Circuit/System Description

The electronic brake control module uses input from the brake pressure sensor for vehicle stability enhancement system functions. The brake pressure sensor is internal to the brake pressure modulator valve.

Conditions for Running the DTC

• Ignition ON.
• Ignition voltage is greater than 10 V.

Conditions for Setting the DTC

• Internal pressure sensor fault.
• The electronic brake control module detects the brake pressure is increasing when braking and did not receive a message that the brake pedal is applied.
• The electronic brake control module detects the brake pressure does not increase when braking, when it received a message that the brake pedal is applied.

Action Taken When the DTC Sets

• A driver information system message and/or a warning indicator may be displayed.
• The electronic brake control module disables the ABS, the traction control system and the vehicle stability enhancement system for the duration of the ignition cycle.

Conditions for Clearing the DTC

• The condition for the DTC is no longer present.
• The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

NOTE: During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stability indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stability indicators are ON with no DTCs set, perform the following steps:

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP) and wait 60 seconds.

2. Ignition ON, if the ABS, Traction Control and/or Stability indicators are still illuminated, operate the vehicle at speeds greater than 16 km/h (10 MPH) to complete the self test. The EBCM should request all indicators to turn OFF.

3. If the indicators remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.

4. Operate the vehicle at speeds greater than 40 km/h (25 MPH), the EBCM should request all indicators to turn OFF.

Diagnostic Aids

DTC C0131 can set if the electronic brake control module is loosely attached to the hydraulic unit. The mountings should be checked for the proper torque.

Reference Information

Schematic Reference

Anti-lock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Apply and release brake pedal. Verify brake lamps operate properly.

• If brake lamps do not operate properly, refer to Symptoms - Lighting.

2. Perform the scan tool electronic brake control module Brake Pressure Sensor Calibration. Refer to Brake Pressure Modulator Valve Pressure Sensor Calibration.

3. Replace the brake pressure modulator valve.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Brake Pressure Modulator Valve Replacement
• Control Module References for Electronic Brake Control Module replacement, programming and setup

DTC C0161: ABS BRAKE SWITCH CIRCUIT

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC C0161 00

• ABS Brake Switch Circuit

Circuit/System Description

The electronic brake control module (EBCM) monitors the brake pressure sensor voltage, vehicle speed and a serial data message from the body control module (BCM) that the brake pedal is either Applied or Released.

When the vehicle is stopping the EBCM detects the brake pressure sensor voltage increases and correlates the readings to the serial data message from the BCM that the brake pedal is applied and the vehicle is slowing down or when the vehicle is accelerating, the brake pedal is Released and brake pressure sensor voltage returns to 0 volts.

Conditions for Running the DTC

• The ignition is ON.
• The vehicle speed is greater than 11 km/h (7 MPH).

Conditions for Setting the DTC

• The EBCM detects the vehicle speed decreases, the brake pedal is released and the brake pressure sensor detects an increase in pressure.
• The EBCM detects the vehicle speed is greater than 11 km/h (7 MPH), the brake pedal is applied for one minute and the brake pressure detects pressure less than the set value.

Action Taken When the DTC Sets

• A driver information center message and/or a warning indicator may be displayed.
• The EBCM disables the ABS, the traction control and the vehicle stability enhancement system for the duration of the ignition cycle.

Conditions for Clearing the DTC

• The condition for the DTC is no longer present.
• The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

NOTE: During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stability indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stability indicators are ON with no DTCs set, perform the following steps:

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP) and wait 60 seconds.

2. Ignition ON, if the ABS, Traction Control and/or Stability indicators are still illuminated, operate the vehicle at speeds greater than 16 km/h (10 MPH) to complete the self test. The EBCM should request all indicators to turn OFF.

3. If the indicators remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.

4. Operate the vehicle at speeds greater than 40 km/h (25 MPH), the EBCM should request all indicators to turn OFF.

Diagnostic Aids

• DTC C0161 can set if the brake is applied while accelerating.
• DTC C0161 will be set if the brake is applied for 60 seconds while at speeds greater than 10 km/h (6 MPH), such as a two footed driving.

Reference Information

Schematic Reference

• Anti-Lock Brake System Schematics
• Exterior Lights Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

NOTE: If the ABS, and/or Traction Control indicators are ON with DTC C0161 set in history, perform the conditions for clearing the DTC and inform the customer that two footed driving set this DTC.

1. Ignition ON.

2. Verify the stop lamps turn ON and OFF while pressing and releasing the brake pedal.

If the stop lamps do not turn ON and OFF

Refer to Symptoms - Lighting.

If the stop lamps turn ON and OFF

3. Refer to Diagnostic Aids.

DTC C0186, C0196 OR C0287: LATERAL ACCELEROMETER/YAW RATE CIRCUIT/LONGITUDINAL ACCELERATION SENSOR/LATERAL ACCELERATION SENSOR

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0186 00

• Lateral Accelerometer Circuit Malfunction

DTC C0186 5A

• Lateral Accelerometer Circuit Not Plausible

DTC C0196 00

• Yaw Rate Circuit Malfunction

DTC C0196 5A

• Yaw Rate Circuit Not Plausible

DTC C0287 00

• Longitudinal Acceleration Sensor Circuit Malfunction

DTC C0287 71

• Longitudinal Acceleration Sensor Circuit Invalid Data

DTC C0287 4B

• Longitudinal Acceleration Sensor Circuit Calibration Not Learned

DTC C0287 5A

• Longitudinal Acceleration Sensor Circuit Not Plausible

DTC C1251 00

• Lateral Acceleration Sensor (Transmission Control Module)

Diagnostic Fault Information

Circuit/System Description

The yaw rate, lateral acceleration and longitudinal acceleration sensors are combined into one yaw/lateral/longitudinal accelerometer sensor, external to the electronic brake control module. The electronic brake control module supplies a 12 V reference and a low reference to the accelerometer sensor. The accelerometer sensor communicates with the electronic brake control module via serial data. The module activates the stability control and the hill start assist function depending on the information received from the accelerometer sensor.

Conditions for Running the DTC

The vehicle speed is greater than 40 km/h (25 MPH).

Conditions for Setting the DTC

C0186 00 or C1251 00

The lateral acceleration sensor signal offset is higher than 2.25 meters per second squared while driving straight ahead on a level surface with normal acceleration.

C0186 5A

• The yaw and lateral accelerometer sensor reports an internal failure.
• The lateral acceleration sensor signal is not plausible with the yaw rate sensor signal.
• Communication is lost between the electronic brake control module and the yaw and lateral accelerometer sensor.

C0196 00

When the vehicle is at standstill the yaw rate is zero. If the calculated offset value is outside the plausible range +- 5.25º per second at start of driving the fault is set.

C0196 5A

• The yaw rate sensor signal is not plausible with the lateral acceleration sensor signal.
• A correlation error between the yaw and lateral accelerometer sensor and steering angle sensor.
• Communication is lost between the electronic brake control module and the yaw and lateral accelerometer sensor.

C0287 00 or C0287 5A

No longitudinal sensor signal is detected.

C0287 71

The electronic brake control module has received invalid serial data from the longitudinal accelerometer sensor.

C0287 4B

The longitudinal acceleration sensor is not calibrated.

C1251 00

The transmission control module sets this DTC.

Action Taken When the DTC Sets

One or more of the following actions may occur:

• The ABS indicator illuminates.
• The Stability indicator illuminates.
• A driver information center message and/or a warning indicator may be displayed.
• The electronic brake control module disables the ABS, the traction control system, the hill start assist and the vehicle stability enhancement system for the duration of the ignition cycle.

Conditions for Clearing the DTC

• The condition for setting the DTC is no longer present and the ignition is cycled OFF then back to RUN.
• The electronic brake control module clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

NOTE: During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stability indicators may be ON with NO DTCs displayed by the electronic brake control module. Do not replace the electronic brake control module for this condition.

If the ABS, Traction Control and/or Stability indicators are ON with no DTCs set, perform the following steps:

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power and wait 60 seconds.

2. Ignition ON, if the ABS, Traction Control and/or Stability indicators are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 MPH) to complete the self test. The electronic brake control module should request the indicators to turn OFF.

3. If the indicators remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.

4. Operate the vehicle at speeds greater than 40 km/h (25 MPH), the electronic brake control module should request all indicators to turn OFF.

Diagnostic Aids

Possible causes of this DTC are as follows:

• Internal failure in the yaw and lateral accelerometer sensor.
• The longitudinal accelerometer sensor is not calibrated.
• Incorrectly mounted or loose yaw and lateral accelerometer sensor.

Reference Information

Schematic Reference

Anti-Lock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Verify that DTC U1826, U2142, C0292 or C0710 is not set.

• If the DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle.

2. Verify that DTC C0287 4B is not set.

• If the DTC is set, refer to Vehicle Yaw Sensor Learn.

3. Inspect the yaw and lateral accelerometer sensor for correct installation.

• If loose or incorrect installation is diagnosed, correct the installation of the component.

4. Ignition OFF, disconnect the harness connector at the yaw and lateral accelerometer sensor.

5. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 ohms between the ground circuit terminal 1 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

6. Ignition ON, test for B+ between the 12 V reference circuit terminal 4 and ground.

• If not within the specified range, test the 12 V reference circuit for a short to ground or open/high resistance.

7. If all circuits test normal, replace the yaw and lateral accelerometer sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement

DTC C0201: ANTI-LOCK BRAKE SYSTEM (ABS) ENABLE RELAY CONTACT CIRCUIT

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC C0201 00

Antilock Brake System (ABS) Enable Relay Contact Circuit

Circuit/System Description

The electronic brake control module controls (EBCM) it's internal valve relay to command the valve solenoids ON or OFF.

Conditions for Running the DTC

• Ignition voltage is greater than 10 V.
• The solenoid relay is commanded ON.

Conditions for Setting the DTC

• The EBCM detects no change when commanding the valve relay ON or OFF.
• The EBCM detects a stuck open solenoid valve relay or an open circuit between the solenoid valve relay and solenoid valves.

Action Taken When the DTC Sets

• A DIC message may be displayed.
• A instrument cluster warning indicator may be displayed.
• The EBCM disables the ABS and the traction control system for the duration of the ignition cycle.

Conditions for Clearing the DTC

• The condition for the DTC is no longer present.
• The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

NOTE: During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stability indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stability indicators are ON with no DTCs set, perform the following steps:

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP) and wait 60 seconds.

2. Ignition ON, if the ABS, Traction Control and/or Stability indicators are still illuminated, operate the vehicle at speeds greater than 16 km/h (10 MPH) to complete the self test. The EBCM should request all indicators to turn OFF.

3. If the indicators remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.

4. Operate the vehicle at speeds greater than 40 km/h (25 MPH), the EBCM should request all indicators to turn OFF.

Reference Information

Schematic Reference

Anti-Lock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, verify that DTC C0201 is not set.

• If DTC is set, replace the Electronic Brake Control Module (EBCM).

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for Electronic Brake Control Module replacement, programming and setup

DTC C0242 OR P0856: TCS MALFUNCTION/TRACTION CONTROL TORQUE REQUEST

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0242 00

Engine Control Module (ECM) Indicated TCS Malfunction

DTC P0856

Traction Control Torque Request Circuit

Circuit/System Description

The electronic brake control module (EBCM) and the engine control module (ECM) simultaneously control the traction control. The EBCM sends a serial data message to the ECM requesting torque reduction. When certain ECM DTCs are set, the ECM will not be able to perform the torque reduction for traction control. A serial data message is sent to the EBCM indicating that traction control is not allowed.

Conditions for Running the DTC

Engine running.

Conditions for Setting the DTC

The ECM detects a fault that prevents it from performing a traction control function and sends a serial data message to the EBCM indicating that torque reduction is not allowed.

Action Taken When the DTC Sets

The EBCM sends a serial data message to illuminate the appropriate warning/indicator message

Conditions for Clearing the DTC

• The condition for the DTC is no longer present.
• The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

NOTE: During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stability indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stability indicators are ON with no DTCs set, perform the following steps:

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP) and wait 60 seconds.

2. Ignition ON, if the ABS, Traction Control and/or Stability indicators are still illuminated, operate the vehicle at speeds greater than 16 km/h (10 MPH) to complete the self test. The EBCM should request all indicators to turn OFF.

3. If the indicators remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.

4. Operate the vehicle at speeds greater than 40 km/h (25 MPH), the EBCM should request all indicators to turn OFF.

Reference Information

Schematic Reference

Anti-Lock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Verify that no other DTCs are set.

• If DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle.

DTC C0245: WHEEL SPEED SENSOR FREQUENCY

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC C0245 00

• Wheel Speed Sensor Frequency

Circuit/System Description

The wheel speed sensor receives ignition voltage from the electronic brake control module (EBCM) and provides an output signal back to the EBCM. As the wheel spins the sensor sends a DC square wave signal to the EBCM. The EBCM uses the frequency of this signal to calculate the wheel speed.

Conditions for Running the DTC

• Brake is not applied.
• Vehicle is not cornering.
• No wheel speed sensor faults exist.
• Ignition voltage is greater than 10 V.

Conditions for Setting the DTC

Wheel speed differences between one wheel and the others is greater than 25 percent.

Action Taken When the DTC Sets

• A DIC message may be displayed.
• A instrument cluster warning indicator may be displayed.
• The EBCM disables the traction control system and the vehicle stability enhancement system for the duration of the ignition cycle.

Conditions for Clearing the DTC

• The condition for the DTC is no longer present.
• The history DTC will clear after 40 consecutive fault-free drive cycles have occurred.

NOTE: During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stability indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stability indicators are ON with no DTCs set, perform the following steps:

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power and wait 60 seconds.

2. Ignition ON, if the ABS, Traction Control and/or Stability indicators are still illuminated, operate the vehicle at speeds greater than 16 km/h (10 MPH) to complete the self test. The EBCM should request all indicators to turn OFF.

3. If the indicators remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.

4. Operate the vehicle at speeds greater than 40 km/h (25 MPH), the EBCM should request all indicators to turn OFF.

Diagnostic Aids

• Faulty wheel speed sensor will not set this DTC.
• A vehicle using a space saver spare will not set this code.

Reference Information

Schematic Reference

Anti-Lock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool Wheel Speed Sensor parameters while spinning the wheels. The readings should be analog to the wheel speeds.

Circuit/System Testing

1. Verify that all tires have the proper air pressure.

• If not the proper air pressure, adjust the air pressure for all tires to specification and verify the DTC does not reset. If the DTC resets, replace the EBCM.

2. Verify that all wheels and tires are the proper size.

• If incorrect wheel or tire size, replace the incorrect wheel or tire and verify the DTC does not reset.

  If the DTC resets, replace the EBCM.

3. If all components test normal, replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for EBCM replacement, programming and setup

DTC C0252: VSES SENSORS UNCORRELATED

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC C0252 00

• VSES Sensors Uncorrelated

Circuit/System Description

The electronic brake control module (EBCM) controls the vehicle stability enhancement system (VSES) by monitoring the inputs of the yaw rate/lateral accelerometer sensor and steering wheel angle sensor. The readings are compared to an internal calibrated value so it knows if the vehicle is having an instability condition to activate the VSES. When the readings indicate a VSES event is occurring longer than 10 seconds is not possible under normal conditions. The yaw/lateral sensor is a combination sensor in one component.

Conditions for Running the DTC

• The steering angle has been centered.
• VSES is active.

Conditions for Setting the DTC

One of the following conditions exist:

• VSES is engaged for 10 seconds with the yaw rate error always in either understeer or oversteer.
• The yaw rate error is greater then 10 degrees/second for 5 seconds and the yaw has not changed and the lateral acceleration is less than 0.5 g.

Action Taken When the DTC Sets

One or more of the following actions may occur:

• The EBCM disables the antilock brake system (ABS)/traction control system (TCS) and vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
• The ABS indicator illuminates.
• The Stabilitrak indicator illuminates.
• The driver information center (DIC) displays All Wheel Drive Off/ Service Traction Control / Service Stabilitrak message.

Conditions for Clearing the DTC

• The condition for the DTC is no longer present.
• The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

NOTE: During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stabilitrak indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stabilitrak telltales are ON with no DTCs set, perform the following steps:

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP) and wait 60 seconds.

2. Ignition ON, if the ABS, Traction Control and/or Stabilitrak telltales are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test. The EBCM should request all telltale indicators to turn OFF.

3. If the telltales remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.

4. Operate the vehicle at speeds greater than 40 km/h (25 mph), the EBCM should request all telltale indicators to turn OFF.

Diagnostic Aids

The following conditions can cause this concern:

• Improper steering alignment or tire pull
• An improperly mounted or loose combination yaw rate/lateral accelerometer sensor
• An internal yaw rate/lateral accelerometer failure

Reference Information

Schematic Reference

Anti-Lock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Verify that DTC C0186, C0196, C0253 or C0710 is not set.

• If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle

DTC C0253: CENTERING ERROR

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC C0253 00

• Centering Error

Circuit/System Description

The electronic brake control module (EBCM) receives serial data messages from the steering wheel position sensor identifying the position and direction of the steering wheel rotation.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

The calculated steering angle from the steering wheel position sensor does not correlate with the steering angle calculated from the yaw rate.

Action Taken When the DTC Sets

One or more of the following actions may occur:

• The ABS indicator illuminates.
• The StabiliTrak indicator illuminates.
• The driver information center displays All Wheel Drive Off, Service Traction Control and Service StabiliTrak messages.
• The EBCM disables the ABS, the traction control system and the vehicle stability enhancement system for the duration of the ignition cycle.

Conditions for Clearing the DTC

• The condition for the DTC is no longer present.
• The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

NOTE: During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stability indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stability indicators are ON with no DTCs set, perform the following steps:

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP) and wait 60 seconds.

2. Ignition ON, if the ABS, Traction Control and/or Stability indicators are still illuminated, operate the vehicle at speeds greater than 16 km/h (10 MPH) to complete the self test. The EBCM should request all indicators to turn OFF.

3. If the indicators remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.

4. Operate the vehicle at speeds greater than 40 km/h (25 MPH), the EBCM should request all indicators to turn OFF.

Reference Information

Schematic Reference

Anti-Lock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify that DTC C0186, C0196, C0252 or C0710 is not set.

• If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle.

2. With the scan tool perform the Steering Angle Sensor Centering. Refer to Steering Angle Sensor Centering.

3. Operate the vehicle within the conditions for setting and verify the DTC does not reset.

• If the DTC sets, replace the Electronic Brake Control Module (EBCM).

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for Electronic Brake Control Module replacement, programming and setup

DTC C0561: SYSTEM DISABLED INFORMATION

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0561 71

• System Disabled Information Stored Invalid Serial Data Received

DTC C0561 72

• System Disabled Information Stored Alive Counter Incorrect

DTC C0561 74

• System Disabled Information Value of Signal Protection Calculation Incorrect

Circuit/System Description

The electronic brake control module (EBCM) receives serial data messages from the body control module (BCM), engine control module (ECM), instrument panel cluster and the transmission control module (TCM) which are needed to perform ABS, vehicle stability enhancement system or traction control system functions.

Conditions for Running the DTC

Ignition voltage is greater than 10 V.

Conditions for Setting the DTC

The EBCM receives an invalid serial data message from another module.

Action Taken When the DTC Sets

• A DIC message may be displayed.
• A instrument cluster warning indicator may be displayed.
• The EBCM disables the traction control system and the vehicle stability enhancement system.

Conditions for Clearing the DTC

• The condition for the DTC is no longer present.
• The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

NOTE: During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stability indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stability indicators are ON with no DTCs set, perform the following steps:

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP) and wait 60 seconds.

2. Ignition ON, if the ABS, Traction Control and/or Stability indicators are still illuminated, operate the vehicle at speeds greater than 16 km/h (10 MPH) to complete the self test. The EBCM should request all indicators to turn OFF.

3. If the indicators remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.

4. Operate the vehicle at speeds greater than 40 km/h (25 MPH), the EBCM should request all indicators to turn OFF.

Diagnostic Aids

This DTC indicates that there are no problems in the EBCM. The BCM, ECM, TCM and the instrument panel cluster should be checked for a possible fault.

Reference Information

Schematic Reference

Anti-Lock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. With a scan tool, view the Invalid Signal Data Display.

2. If no invalid signal are present, view Signal Fault Data in the Enhanced DTC Data.

3. Refer to appropriate module for diagnosing the invalid message data.

4. Do not replace the EBCM due to this DTC fault.

DTC C0569: SYSTEM CONFIGURATION ERROR

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC C0569 00

• System Configuration Error

Circuit/System Description

The electronic brake module (EBCM) receives a serial data message from each of the network modules. Each module contains its own unique identification (ID) code that must be programmed into a new the EBCM.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

The EBCM has not undergone the programming procedure.

Action Taken When the DTC Sets

• The EBCM disables the ABS/ traction control system (TCS)/ vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
• The ABS indicator illuminates.
• The Red brake indicator illuminates.
• The Stability Control indicator illuminates.
• The driver information center (DIC) displays All Wheel Drive OFF, Service Stabilitrak and Service Traction Control messages.

Conditions for Clearing the DTC

• The condition for the DTC is no longer present.
• The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

NOTE: During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stabilitrak indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stabilitrak telltales are ON with no DTCs set, perform the following steps:

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP) and wait 60 seconds.

2. Ignition ON, if the ABS, Traction Control and/or Stabilitrak telltales are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test. The EBCM should request all telltale indicators to turn OFF.

3. If the telltales remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.

4. Operate the vehicle at speeds greater than 40 km/h (25 mph), the EBCM should request all telltale indicators to turn OFF.

Diagnostic Aids

A newly replaced EBCM will set DTC C0569 on its initial ignition ON cycle.

Reference Information

Schematic Reference

Anti-Lock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Verify that C0569 is not set.

• If the DTC is set, program the EBCM. If the DTC resets, replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, programming and setup

DTC C0710: STEERING POSITION SIGNAL

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C071

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