Buick Enclave: Specifications, Diagnostic Information and Procedures

SPECIFICATIONS

FASTENER TIGHTENING SPECIFICATIONS

Fastener Tightening Specifications

SCHEMATIC WIRING DIAGRAMS

STEERING WHEEL WIRING SCHEMATICS

Heated Steering Wheel

Fig. 1: NO CONTENT

TILT/TELESCOPING STEERING COLUMN WIRING SCHEMATICS

N38

Fig. 2: NO CONTENT

DIAGNOSTIC INFORMATION AND PROCEDURES

DIAGNOSTIC CODE INDEX

DTC B2850, B2855, B2870 OR B2875: TELESCOPE FORWARD/TILT SWITCH

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 B2850 01

• Telescope Forward Switch Circuit Short to Battery

DTC B2855 01

• Telescope Rearward Switch Circuit Short to Battery

DTC B2870 01

• Tilt Up Switch Circuit Short to Battery

DTC B2875 01

• Tilt Down Switch Circuit Short to Battery

Diagnostic Fault Information

Circuit Description

The memory seat module (MSM) receives voltage inputs from the tilt/telescope switch based on the position of the switch. The MSM then supplies battery voltage and a ground to the tilt or telescope motor control circuits depending on which direction of movement is requested.

Conditions for Running the DTC

The ignition ON.

Conditions for Setting the DTC

The MSM detects a tilt or telescope switch input for more than 30 consecutive seconds after the tilt or telescope motor movement has stopped.

Action Taken When the DTC Sets

• The tilt or telescope motor will be deactivated.
• Memory recall functions will be disabled.

Conditions for Clearing the DTC

• A current DTC will clear when the failed switch input is no longer active.
• A history DTC will clear after 100 ignition cycles.

Diagnostic Aids

An intermittently stuck tilt or telescope switch may cause a DTC to set.

Reference Information

Schematic Reference

Tilt/Telescoping Steering Column Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Steering Wheel and Column 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 appropriate scan tool Tilt or Telescope Switch parameter while cycling the tilt/telescope switch between states. The parameter should change between Inactive and Active.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the tilt/telescope switch.

2. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 1 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

3. Verify the scan tool tilt switch and telescope switch parameters are Inactive.

• If not the specified value, test the signal circuits listed below for a short to voltage. If the circuit tests normal, replace the MSM.
• Tilt Up Switch terminal 2
• Tilt Down Switch terminal 6
• Telescope Forward Switch terminal 3
• Telescope Rearward Switch terminal 5

4. Install a 3A fused jumper wire between the signal circuits listed below and the B+ circuit terminal 1.

Verify the scan tool tilt switch and telescope switch parameters are Active.

• Tilt Up Switch terminal 2
• Tilt Down Switch terminal 6
• Telescope Forward Switch terminal 3
• Telescope Rearward Switch terminal 5
• If not the specified value, test the appropriate signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.

5. If all circuit test normal, test or replace the tilt/telescope switch.

Component Testing

Tilt/Telescope Switch

1. Ignition OFF, disconnect the harness connector at the tilt/telescope switch.

2. Test for infinite resistance between the signal terminals listed below and the B+ terminal 1 with the switch in the neutral position:

• Tilt Up Switch terminal 2
• Tilt Down Switch terminal 6
• Telescope Forward Switch terminal 3
• Telescope Rearward Switch terminal 5
• If less than the specified range, replace the steering column.

3. Test for less than 1 ohm between the B+ terminal 1 and the signal terminal 2 with the switch in the TILT UP position.

• If greater than the specified range, replace the steering column.

4. Test for less than 1 ohm between the B+ terminal 1 and the signal terminal 6 with the switch in the TILT DOWN position.

• If greater than the specified range, replace the steering column.

5. Test for less than 1 ohm between the B+ terminal 1 and the signal terminal 5 with the switch in the TELESCOPE OUT position.

• If greater than the specified range, replace the steering column.

6. Test for less than 1 ohm between the B+ terminal 1 and the signal terminal 3 with the switch in the TELESCOPE IN position.

• If greater than the specified range, replace the steering column.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• Steering Column Tilt Wheel and Telescope Switch Replacement
• Control Module References for MSM replacement, setup and programming

DTC B2860 OR B2880: TELESCOPE/TILT POSITION 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 B2860 01

• Telescope Position Sensor Circuit Short to Battery

DTC B2860 06

• Telescope Position Sensor Circuit Short to Ground or Open

DTC B2860 5A

• Telescope Position Sensor Circuit Plausibility Failure

DTC B2860 61

Telescope Position Sensor Actuator Stuck

DTC B2880 01

• Tilt Position Sensor Circuit Short to Battery

DTC B2880 06

• Tilt Position Sensor Circuit Short to Ground or Open

DTC B2880 5A

• Tilt Position Sensor Circuit Plausibility Failure

DTC B2880 61

• Tilt Position Sensor Actuator Stuck

Diagnostic Fault Information

Circuit Description

The memory seat module (MSM) determines the position of the steering column based on inputs received from the tilt or telescope position sensors built into the tilt or telescope actuators. The MSM supplies a 5-volt reference and a low reference to the sensors and monitors the column position via the steering column tilt or telescope sensor signal circuit.

Conditions for Running the DTC

Ignition ON

Conditions for Setting the DTC

B2860 01

The steering column telescope sensor signal voltage is greater than 4.8 volts for more than 2 seconds.

B2860 06

The steering column telescope sensor signal voltage is less than 0.2 volt for more than 2 seconds.

B2860 5A

An incorrect steering column telescope sensor signal voltage is seen.

B2860 61

The steering column telescope sensor signal voltage does not change when the telescope actuator is commanded.

B2880 01

The steering column tilt sensor signal voltage is greater than 4.8 volts for more than 2 seconds.

B2880 06

The steering column tilt sensor signal voltage is less than 0.2 volt for more than 2 seconds.

B2880 5A

An incorrect steering column tilt sensor signal voltage is seen.

B2880 61

The steering column tilt sensor signal voltage does not change when the telescope actuator is commanded.

Action Taken When the DTC Sets

Steering column tilt operations are suspended.

Conditions for Clearing the DTC

• A current DTC will clear when the malfunction is no longer present
• A history DTC will clear after 50 malfunction-free ignition cycles.

Reference Information

Schematic Reference

Tilt/Telescoping Steering Column Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Steering Wheel and Column 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. Ignition ON, observe the scan tool Tilt Sensor and Telescope Sensor parameter. The readings should be between 0.2 and 4.8 volts.

• If not within the specified range, refer to Circuit/System Testing - Tilt/Telescope Sensor Circuit Malfunction.

2. Command the column to tilt up and down and telescope in and out using the tilt/telescope switch. The column should move in the commanded direction.

• If the column does not operate as specified, refer to Circuit/System Testing - Tilt/Telescope Actuator Circuit Malfunction.

Circuit/System Testing

Telescope or Tilt Sensor Circuit Malfunction

1. Ignition OFF, disconnect the harness connector at the steering wheel tilt/telescope position sensor.

2. Ignition OFF, test for less than 2.0 ohms between the low reference circuit terminal B and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the MSM.

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C and ground.

• If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
• If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.

4. Verify the scan tool Tilt Sensor and Telescope Sensor parameter is less than 0.2 volt.

• If greater than the specified range, test the signal circuits listed below for a short to voltage. If the circuit tests normal, replace the MSM.
• Tilt Sensor terminal A
• Telescope Sensor terminal D

5. Install a 3A fused jumper wire between the signal circuits listed below and the 5-volt reference circuit terminal C. Verify the scan tool tilt sensor and telescope sensor parameter is greater than 4.8 volts.

• Tilt Sensor terminal A
• Telescope Sensor terminal D
• If less than the specified range, test the appropriate signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.

6. If all circuits test normal, replace the steering column.

Tilt/Telescope Actuator Circuit Malfunction

1. Ignition OFF, disconnect the harness connector at the tilt/telescope actuator.

2. Install a test lamp between the control circuit terminals listed below of the tilt/telescope motor.

• Tilt Up/Tilt Down terminals 1 and 2
• Telescope Forward/Telescope Rearward terminals 1 and 2

3. Command the column to tilt up and down or telescope in and out using the tilt/telescope switch. The test lamp should illuminate with each command.

• If the test lamp does not illuminate, test the appropriate tilt/telescope control circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the MSM.

4. If all circuits test normal, replace the steering column.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• Steering Column Replacement
• Control Module References for MSM replacement, setup and programming

DTC B2890: TILT AND TELESCOPE MOTOR CIRCUIT CALIBRATION NOT LEARNED

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 B2890 4B

• Tilt and Telescope Motor Circuit Calibration Not Learned

Circuit Description

The memory seat module MSM learns tilt/telescope soft stops approximately 1.3 cm (0.5 in) from the mechanical ends of travel. The system uses soft stops to prevent wear on the system by ensuring that the steering column movement stops before it reaches its mechanical end of travel in any direction. The soft stops are initially programmed at the factory. The stop positions may be reprogrammed, which is necessary any time the MSM is replaced.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

The soft stops have not been learned.

Action Taken When the DTC Sets

• The tilt and telescope motors will be deactivated.
• Memory recall functions will be disabled.

Conditions for Clearing the DTC

• A current DTC will clear when the soft stops have been learned.
• A history DTC will clear after 100 ignition cycles.

Reference Information

Schematic Reference

Tilt/Telescoping Steering Column Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Steering Wheel and Column 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. Ignition ON, perform the scan tool Learn Column Soft Stops procedure. Refer to Telescoping Steering Column Calibration 2. Operate the vehicle within the Conditions for Running and Setting. Verify DTC B2890 does not reset.

• If the DTC resets, replace the MSM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for MSM replacement, setup and programming

SYMPTOMS - STEERING WHEEL AND COLUMN

Review the system description and operation in order to familiarize yourself with the system functions. Refer to Steering Wheel and Column Description and Operation.

Visual/Physical Inspection

• Inspect for aftermarket devices which could affect the operation of the steering wheel and column.
• Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Symptoms List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

• Steering Column Tilt/Telescoping Malfunction
• Noise in Steering Column
• Steering Column Tilt Function Inoperative
• High Shift Effort
• Looseness in Steering Column

HEATED STEERING WHEEL INDICATOR MALFUNCTION

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.

Diagnostic Fault Information

Circuit/System Description

The heated steering wheel system consists of a heated steering wheel, a heated steering wheel switch and a steering wheel heat module. The heated steering wheel includes non-serviceable heating elements and a temperature sensor. The heating elements and sensor are located around the entire rim of the steering wheel.

The heated steering wheel switch is located in the left steering wheel control switch assembly. The steering wheel heat module is located on the left side of the steering wheel center hub. When the switch is pressed, the switch signal circuit is grounded and the heat module turns the heated steering wheel on. The system then remains on until the customer turns it off. The wheels normal operating temperature is 32ºC (89.6ºF). The wheel takes approximately 3 to 4 minutes to reach the normal operating temperature. The wheel will take longer to heat up if the vehicle temperature is below -21ºC (-5.8ºF). The built-in temperature sensor provides input to the controller to limit the temperature to the normal operating temperature. The wheel will not operate if the vehicle temperature is at or above 32ºC (89.6ºF).

Reference Information

Schematic Reference

• Steering Wheel Schematics
• Cruise Control Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Steering Wheel and Column Description and Operation

Electrical Information Reference

• Testing for Intermittent Conditions and Poor Connections
• Circuit Testing

Circuit/System Verification

1. Ignition ON.

2. Verify the S70L Steering Wheel Controls Switch - Left is OFF. The steering wheel heater indicator should not be illuminated and the left and right sides of the steering wheel should not be warm.

The steering wheel is always warm

Refer to Heated Steering Wheel Malfunction

The steering wheel does not become warm and the heater indicator is illuminated

Refer to Circuit/System Testing

The steering wheel does not become warm and the heater indicator is not illuminated

3. Press and release the S70L Steering Wheel Controls Switch - Left. The steering wheel heater indicator should illuminate and the left and right sides of the steering wheel should become warm.

The steering wheel does not become warm

Refer to Heated Steering Wheel Malfunction

The steering wheel becomes warm and the heater indicator does not illuminate

Refer to Circuit/System Testing

The steering wheel becomes warm and the heater indicator illuminates

4. All OK.

Circuit/System Testing

1. Ignition OFF, disconnect the X5 in-line harness connector at the K32 Heated Steering Wheel Control Module.

2. Test for less than 10 ohms between the ground circuit terminal 2 and ground.

If 10 ohms or greater

1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
   • If 2 ohms or greater, repair the open/high resistance in the circuit.
   • If less than 2 ohms, repair the open/high resistance in the ground connection.

If less than 10 ohms

3. Ignition ON.

4. Verify a test lamp illuminates between the ignition voltage circuit terminal 1 and ground.

If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF, remove the test lamp.
2. Test for less than 2 ohms in the ignition circuit end to end.
   • If less than 2 ohms, verify the fuse is OK and there is voltage at the fuse. Refer to Power Mode Mismatch.
   • If 2 ohms or greater
3. Verify the in-line fuse is OK and there is voltage at the fuse.
   • If the in-line fuse is blown, replace the K32 Steering Wheel Heating Control Module.
   • If the in-line fuse is OK, repair the open/high resistance in the circuit.

If the test lamp does not illuminate and the circuit fuse is open

1. Ignition OFF.
2. Test for infinite resistance between the ignition voltage circuit and ground.
   • If less than infinite resistance, repair the short to ground on the circuit.
   • If infinite resistance, replace the K32 Steering Wheel Heating Control Module.

If the test lamp illuminates

5. Ignition OFF, connect the X5 in-line harness connector. Disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.

6. Test for less than 10 ohms between the ground terminal 8 and ground.

If 10 ohms or greater

1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
   • If 2 ohms or greater, repair the open/high resistance in the circuit.
   • If less than 2 ohms, repair the open/high resistance in the ground connection.

If less than 10 ohms

7. Connect the harness connector at the S70L Steering Wheel Controls Switch - Left.

8. Disconnect the in-line connector at the S70L Steering Wheel Controls Switch - Left.

9. Install a 3A fused jumper wire between the indicator control circuit terminal 2 and B+.

10. Verify the heated steering wheel indicator is illuminated.

If the indicator does not illuminate

Replace the S70L Steering Wheel Controls Switch - Left.

If the indicator illuminates

11. Replace the K32 Steering Wheel Heating Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Steering Wheel Control Switch Assembly Replacement (Traverse) and Steering Wheel Control Switch Assembly Replacement (Acadia/Enclave)
• Control Module References for heated steering wheel control module replacement, programming and setup.

HEATED STEERING WHEEL MALFUNCTION

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.

Diagnostic Fault Information

Circuit/System Description

The heated steering wheel system consists of a heated steering wheel, a heated steering wheel switch and a steering wheel heat module. The heated steering wheel includes non-serviceable heating elements and a temperature sensor. The heating elements and sensor are located around the entire rim of the steering wheel.

The heated steering wheel switch is located in the left steering wheel control switch assembly. The steering wheel heat module is located on the left side of the steering wheel center hub. When the switch is pressed, the switch signal circuit is grounded and the heat module turns the heated steering wheel on. The system then remains on until the customer turns it off. The wheels normal operating temperature is 32ºC (89.6ºF). The wheel takes approximately 3 to 4 minutes to reach the normal operating temperature. The wheel will take longer to heat up if the vehicle temperature is below -21ºC (-5.8ºF). The built-in temperature sensor provides input to the controller to limit the temperature to the normal operating temperature. The wheel will not operate if the vehicle temperature is at or above 32ºC (89.6ºF).

Diagnostic Aids

• Before replacing the steering wheel for complaints of not getting hot enough, a reliable infrared temperature gun should be used to measure the temperature at various points around the rim. The steering wheel's normal operating temperature is 32ºC (89.6ºF) and takes approximately 10 min to reach that temperature. It may take up to 20 min for the normal operating temperature to stabilize within the steering wheel rim. There may be spike in temperature during the first 3-4 min before it stabilizes at normal operating temperature. The steering wheel will take longer to heat up if the vehicle temperature is below - 21ºC (-5.8ºF). The steering wheel heater will not operate when the steering wheel temperature is above 32ºC (89.6ºF).
• The infrared measurements are made at the rim (1) at the 3 and 9 o'clock positions of the steering wheel.

Fig. 3: Steering Wheel Rim Measurement Point

• The wood sections and the stitching are not heated. Temperature measurements should not be made on the face (1) to insure accurate temperature readings.

Fig. 4: Temperature Measurement Points

Reference Information

Schematic Reference

Steering Wheel Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Steering Wheel and Column Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Waterleak Test Preparation

Circuit/System Verification

Using an Infrared Temperature Gun

1. Engine running, all accessories OFF.

2. Verify the steering wheel heater switch is OFF and the steering wheel heater indicator should not be illuminated.

If the heater indicator is illuminated

Refer to Heated Steering Wheel Indicator Malfunction

If the heater indicator is not illuminated

3. Measure the temperature readings at the 3 and 9 o'clock positions on the steering wheel rim (1).

Fig. 5: Steering Wheel Rim Measurement Point

NOTE: The Infrared Temperature Gun should be within 50.8 mm (2 in) and parallel to the steering wheel rim when taking temperature readings.

4. Verify that the steering wheel temperature is 25ºC (77ºF) or below.

If the steering wheel temperature is greater than 25ºC (77ºF)

Allow the steering wheel to cool before proceeding to next step.

If the steering wheel temperature is 25ºC (77ºF) or below

5. Press and release the steering wheel heater switch. The steering wheel heater indicator should illuminate.

Allow the steering wheel to heat for a minimum of 10 min so that the temperature stabilizes.

If the heater indicator does not illuminate

Refer to Heated Steering Wheel Indicator Malfunction

If the heater indicator illuminates

6. Measure the temperature readings at the 3 and 9 o'clock positions on the steering wheel rim (1).

Fig. 6: Steering Wheel Rim Measurement Point

NOTE: The Infrared Temperature Gun should be within 50.8 mm (2 in) and parallel to the steering wheel rim when taking temperature readings.

7. Verify that the steering wheel temperature is greater than 28ºC (82.4ºF) within 20 min.

If after 20 minutes the measured temperature is less than 28ºC (82.4ºF)

Refer to Circuit/System Testing.

If after 20 minutes the measured temperature is 28ºC (82.4ºF) or greater

8. All OK.

Circuit/System Testing

1. Ignition OFF, disconnect the X5 in-line harness connector at the K32 Heated Steering Wheel Control Module.

2. Test for less than 10 ohms between the ground terminal 2 and ground.

If 10 ohms or greater

1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
   • If 2 ohms or greater, repair the open/high resistance in the circuit.
   • If less than 2 ohms, repair the open/high resistance in the ground connection.

If less than 10 ohms

3. Ignition ON.

4. Verify a test lamp illuminates between the B+ terminal 1 and ground.

If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF, remove the test lamp.
2. Test for less than 2 ohms in the ignition circuit end to end.
   • If less than 2 ohms, verify the fuse is OK and there is voltage at the fuse. Refer to Power Mode Mismatch.
   • If 2 ohms or greater
3.  Verify the in-line fuse is OK and there is voltage at the fuse.
   • If the in-line fuse is blown, replace the K32 Steering Wheel Heating Control Module.
   • If the in-line fuse is OK, repair the open/high resistance in the circuit.

If the test lamp does not illuminate and the circuit fuse is open

1. Ignition OFF, remove the test lamp.
2. Test for infinite resistance between the ignition circuit and ground.
   • If less than infinite resistance, repair the short to ground on the circuit.
   • If infinite resistance, replace the K32 Steering Wheel Heating Control Module.

If the test lamp illuminates

5. Ignition OFF, reconnect the in-line harness connector X5. Disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.

6. Test for less than 10 ohms between the ground circuit terminal 8 and ground.

If 10 ohms or greater

1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
   • If 2 ohms or greater, repair the open/high resistance in the circuit.
   • If less than 2 ohms, repair the open/high resistance in the ground connection.

If less than 10 ohms

7. Ignition ON.

8. Test for 4.5-5.5 V between the signal circuit terminal 2 and ground.

If less than 4.5 V

1. Ignition OFF, disconnect the in-line connector at the S70L Steering Wheel Controls Switch - Left.
2. Test for infinite resistance between the signal circuit and ground.
   • If less than infinite resistance, repair the short to ground on the circuit.
   • If infinite resistance
3. Test for less than 2 ohms in the signal circuit end to end.
   • If 2 ohms or greater, repair the open/high resistance in the circuit.
   • If less than 2 ohms, replace the K32 Steering Wheel Heating Control Module.

If 5.5 V or greater

1. Ignition OFF, disconnect the in-line connector at the S70L Steering Wheel Controls Switch - Left.
2. Test for less than 1 V between the signal circuit and ground.
   • If 1 V or greater, repair the short to voltage on the circuit.
   • If less than 1 V, replace the K32 Steering Wheel Heating Control Module.

If with in 4.5-5.5 V

9. Place the S70L Steering Wheel Controls Switch - Left in the OFF position.

10. Test for infinite resistance between terminal 2 and terminal 8 at the S70L Steering Wheel Controls Switch - Left.

If less than infinite resistance

Replace the S70L Steering Wheel Controls Switch - Left

If infinite resistance

11. Place the S70L Steering Wheel Controls Switch - Left in the ON position.

12. Test for less than 2 ohms between terminal 2 and terminal 8.

If 2 ohms or greater

Replace the S70L Steering Wheel Controls Switch - Left

If less than 2 ohms

13. Ignition OFF, disconnect the in-line harness connector at the E15 Steering Wheel Heater.

14. Test for less than 10 ohms between the ground circuit listed below and ground.

Terminal A at the K32 Steering Wheel Heating Control Module Terminal D at the K32 Steering Wheel Heating Control Module

If 10 ohms or greater

Repair the open/high resistance in the circuit.

If less than 10 ohms

15. Test for 1.5-3.0 ohms between the control circuit terminal B and the ground circuit terminal A at the E15 Steering Wheel Heater.

If not within the specified range

Replace the E15 Steering Wheel Heater.

If within the specified range

16. Test for 5024-104280 ohms between the signal circuit terminal C and the ground circuit terminal D at the E15 Steering Wheel Heater.

If not within the specified range

Replace the E15 Steering Wheel Heater.

If within the specified range

17. Replace the K32 Steering Wheel Heat Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Steering Wheel Control Switch Assembly Replacement (Traverse) and Steering Wheel Control Switch Assembly Replacement (Acadia/Enclave)
• Steering Wheel Replacement
• Control Module References for heated steering wheel control module replacement, programming and setup.

STEERING COLUMN TILT/TELESCOPING MALFUNCTION

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

Circuit Description

The memory seat module (MSM) receives voltage inputs from the tilt/telescope switch based on the position of the switch. The MSM then supplies battery voltage and a ground to the tilt or telescope motor control circuits depending on which direction of movement is requested.

The MSM determines the position of the steering column based on inputs received from the telescope position sensor, built into the telescoping actuator. The MSM supplies a 5-volt reference and a low reference to the sensor and monitors the column position via the steering column telescope sensor signal circuit.

Reference Information

Schematic Reference

Tilt/Telescoping Steering Column Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Steering Wheel and Column 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. Ignition ON, observe the scan tool Tilt Up Switch, Tilt Down Switch, Telescope Forward Switch and Telescope Rearward Switch parameters while cycling the tilt/telescope switch between the TILT UP, TILT DOWN, TELESCOPE IN and TELESCOPE OUT positions. The parameters should cycle between Inactive and Active.

• If any of the parameters do not cycle between the specified values, refer to Circuit/System Testing - Tilt/Telescope Switch Circuit Malfunction.

2. Observe the scan tool Tilt Sensor and Telescope Sensor parameter. The readings should be between 0.2 and 4.8 volts.

• If not within the specified range, refer to Circuit/System Testing - Tilt/Telescope Sensor Circuit Malfunction.

3. Command the column to tilt up and down and telescope in and out using the tilt/telescope switch. The column should move in the commanded direction.

• If the column does not operate as specified, refer to Circuit/System Testing - Tilt/Telescope Actuator Circuit Malfunction.

Circuit/System Testing

Tilt/Telescope Switch Circuit Malfunction

1. Ignition OFF, disconnect the harness connector at the tilt/telescope switch.

2. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 1 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

3. Verify the scan tool tilt switch and telescope switch parameters are Inactive.

• If not the specified value, test the signal circuit listed below for a short to voltage. If the circuit tests normal, replace the MSM.
• Tilt Up Switch terminal 2
• Tilt Down Switch terminal 6
• Telescope Forward Switch terminal 3
• Telescope Rearward Switch terminal 5

4. Install a 3A fused jumper wire between the signal circuit listed below and the B+ circuit terminal 1.

Verify the scan tool tilt switch and telescope switch parameters are Active.

• Tilt Up Switch terminal 2
• Tilt Down Switch terminal 6
• Telescope Forward Switch terminal 3
• Telescope Rearward Switch terminal 5
• If not the specified value, test the appropriate signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.

5. If all circuit test normal, test or replace the tilt/telescope switch.

Tilt/Telescope Sensor Circuit Malfunction

1. Ignition OFF, disconnect the harness connector at the steering wheel tilt/telescope position sensor.

2. Ignition OFF, test for less than 2.0 ohms between the low reference circuit terminal B and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the MSM.

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C and ground.

• If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
• If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.

4. Verify the scan tool tilt sensor and telescope sensor parameter is less than 0.2 volts.

• If greater than the specified range, test the signal circuit listed below for a short to voltage. If the circuit tests normal, replace the MSM.
• Tilt Sensor terminal A
• Telescope Sensor terminal D

5. Install a 3A fused jumper wire between the signal circuit listed below and the 5-volt reference circuit terminal C. Verify the scan tool tilt sensor and telescope sensor parameter is greater than 4.8 volts.

• Tilt Sensor terminal A
• Telescope Sensor terminal D
• If less than the specified range, test the appropriate signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.

6. If all circuits test normal, replace the steering column.

Tilt/Telescope Actuator Circuit Malfunction

1. Ignition OFF, disconnect the harness connector at the tilt/telescope actuator.

2. Install a test lamp between the control circuit terminals listed below of the tilt/telescope motor.

• Tilt Up/Tilt Down terminals 1 and 2
• Telescope Forward/Telescope Rearward terminals 1 and 2

3. Command the column to tilt up and down or telescope in and out using the tilt/telescope switch. The test lamp should illuminate with each command.

• If the test lamp does not illuminate, test the appropriate tilt/telescope control circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the MSM.

4. If all circuits test normal, replace the steering column.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• Steering Column Replacement
• Steering Column Tilt Wheel and Telescope Switch Replacement
• Control Module References for MSM replacement, setup and programming

STEERING COLUMN TILT FUNCTION INOPERATIVE

Steering Column Tilt Function Inoperative

NOISE IN STEERING COLUMN

Noise in Steering Column

HIGH SHIFT EFFORT

High Shift Effort

LOOSENESS IN STEERING COLUMN

Looseness in Steering Column

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