Chevrolet Trax: 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.

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 heated steering module supplies voltage to the indicator lamp and supplies voltage to the heating elements, which are internal to the steering wheel.

Reference Information

Schematic Reference

Steering Wheel Schematics (Encore)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

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

Circuit/System Verification

1. Ignition ON.
2. 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

3. All OK.

Circuit/System Testing

1. Ignition OFF, disconnect the X2 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 greate

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, connect the X2 harness connector. Disconnect the X3 harness connector at the K32 heated steering wheel control module.
6. Ignition ON, test for less than 10 ohms between the ground circuit terminal 1 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, replace the A26 HVAC Controls.

If less than 10 ohms

7. Connect a test lamp between the control circuit terminal 2 and ground.
8. Verify the test lamp does not illuminate with the heated steering wheel control switch in the OFF position.

If the test lamp illuminates

1. Ignition OFF, remove the test lamp.
2. Test for less than 1 V between the control circuit and ground

• If 1 V or greater, repair the short to voltage on the circuit
• If less than 1 V, replace the A26 HVAC Controls.

If the test lamp does not illuminate

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

NOTE: The test lamp will illuminate very dim.

10. Verify the test lamp illuminates.

If the test lamp does not illuminate

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

3. 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, replace the A26 HVAC Controls.

If the test lamp illuminates

11. Replace the K32 Steering Wheel Heat Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for heated steering wheel control module and HVAC controls replacement, programming, and setup.

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