Heated Steering Wheel Malfunction

Heated Steering Wheel Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

The heated steering wheel control module controls the heated steering wheel and the heated steering wheel on indicator based on an input from the heated steering wheel switch. When the heated steering wheel switch is pressed, the switch signal circuit is pulled to ground. This indicates to the heating steering wheel control module that steering wheel heat is requested. When the request is seen, the heat steering control module supplies voltage to the indicator lamp and supplies voltage to the heating elements.

Reference Information

Schematic Reference

Steering Wheel Schematics Steering Wheel Schematics

Connector End View Reference

Component Connector End Views A/C Compressor Clutch

Description and Operation

Steering Wheel and Column Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Waterleak Test Preparation Waterleak Test Preparation

Circuit/System Verification

Ignition ON, press and release the heated steering wheel switch. The heated steering wheel indicator should illuminate and both sides of the steering wheel should become warm.

Circuit/System Testing

1. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Disconnect the X277 inline harness connector at the heated steering wheel control module.

2. Test for less than 10 ohms between the ground terminal B X277 and ground.

• 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 ignition circuit terminal A X277 and ground.

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

4. Ignition OFF, reconnect the inline harness connector X277, disconnect the harness connector at the steering wheel control switch - left.

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

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

6. Ignition ON, test for 4.5-5.5 V between the signal circuit terminal 2 and ground.

• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the heated steering wheel control module.

• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the heated steering wheel control module.

7. Test for 80-90 Kohms between the low reference circuit terminal 9 and ground.

• If less than the specified range, test the low reference circuit for a short to ground. If the circuit tests normal, replace the body control module.

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

8. Install a 3 A fused jumper wire momentarily between the signal circuit terminal 2 and ground circuit terminal 8. Using a DMM, test for B+ between the control circuit terminal 4 and ground.

• If not the specified value, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the heated steering wheel control module.

9. Ignition OFF, disconnect the inline harness connector at the heated steering wheel.

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

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

11. At the heated steering wheel, test for less than 10 ohms between the control circuit terminal B and the ground circuit terminal A.

• If greater than the specified range, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the heated steering wheel.

12. Ignition OFF, test for 1.8-2.8 Mohms between the signal circuit terminal C and ground.

• If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the heated steering wheel control module.

• If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the heated steering wheel control module.

13. Ignition ON, test for 4.2-5.8 V between the 5 V reference circuit terminal D and ground.

• If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the heated steering wheel control module.

• If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the heated steering wheel control module.

14. Test for 6000-35000 ohms at the steering wheel side of the connector between the signal circuit terminal C and the 5 V reference circuit terminal D.

• If not within the specified range, replace the heated steering wheel.

15. If all circuits test normal, test or replace the heated steering wheel control module.

Component Testing

Heated Steering Wheel Control Switch

1. Place the heated steering wheel control switch in the OFF position.

2. Test for infinite resistance between terminal 2 and terminal 8.

• If less than the specified value, replace the switch.

3. Place the heated steering wheel control switch in the ON position.

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

• If greater than the specified value, replace the switch.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Steering Wheel Control Switch Assembly Replacement (Traverse) Service and RepairSteering Wheel Control Switch Assembly Replacement (Acadia/Enclave) Service and Repair

* Control Module References Control Module References for heated steering wheel control module replacement, setup, and programming