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 heated steering wheel control 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 Steering Wheel Schematics
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
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
* Wiring Repairs Wiring Repairs
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the K32 heated steering wheel control module.
2. Test for less than 10 ohms between the ground circuit terminal 2 X3 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, verify a test lamp illuminates between the ignition voltage circuit terminal 1 X3 and ground.
• If the test lamp does not illuminate and the circuit fuse is good
1. Ignition OFF.
2. Test for less than 2 ohms in the ignition voltage circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
• 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 heated steering wheel control module.
• If the test lamp illuminates
4. Ignition OFF, connect the X3 harness connector and disconnect the harness connector at the S70L heated steering wheel control switch.
5. Test for less than 10 ohms between the ground circuit terminal 4 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
6. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 5 and ground.
• If less than 4.8 V
1. Ignition OFF, disconnect the X2 harness connector at the K32 heated steering wheel control module.
2. Test for infinite resistance between the 5 V reference 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 5 V reference 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 heated steering wheel control module.
• If greater than 5.2 V
1. Ignition OFF, disconnect the X2 harness connector at the K32 heated steering wheel control module, Ignition ON.
2. Test for less than 1 V between the 5 V reference circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K32 heated steering wheel control module.
• If between 4.8-5.2 V
7. Connect a test lamp between the control circuit terminal 6 and ground. Verify the test lamp does not illuminate with the heated steering wheel OFF.
• If the test lamp illuminates
1. Ignition OFF, disconnect the X2 harness connector at the K32 heated steering wheel control module, Ignition ON.
2. Test for less than 1 V between the 5 V reference circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K32 heated steering wheel control module.
• If the test lamp does not illuminate
8. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the ground circuit terminal 4. Verify the test lamp illuminates very dim.
• If the test lamp does not illuminate
1. Ignition OFF, disconnect the X2 harness connector at the K32 heated steering wheel control module.
2. Test for infinite resistance between the 5 V reference 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 5 V reference 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 heated steering wheel control module.
• If the test lamp illuminates
9. Ignition OFF, disconnect the X1 and X3 harness connector at the heated steering wheel.
10. Test for less than 10 ohms between the ground circuit listed below and ground.
* Terminal B X1 on the module harness side
* Terminal C X1 on the module harness side
• 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 K32 heated steering wheel control module.
• If less than 10 ohms
11. Test for 5322-97072 ohms between the signal terminal D X1 and the ground terminal C X1 on the heated steering wheel harness side.
• If not within the specified range
Replace the E15 heated steering wheel.
• If within the specified range
12. Test for 1.5-3.0 ohms between the control circuit terminal A X1 and the ground terminal B X1 on the heated steering wheel harness side.
• If not within the specified range
Replace the E15 heated steering wheel.
• If within the specified range
13. All OK.
Component Testing
Heated Steering Wheel Control Switch
1. Ignition OFF, disconnect the harness connector at the S70L heated steering wheel control switch.
2. Place the S70L heated steering wheel control switch in the OFF position.
3. Test for infinite resistance between terminal 4 and terminal 5.
• If less than infinite resistance
Replace the S70L heated steering wheel control switch.
• If infinite resistance
4. Place the S70L heated steering wheel control switch in the ON position.
5. Test for less than 2 ohms between terminal 4 and terminal 5.
• If 2 ohms or greater
Replace the S70L heated steering wheel control switch.
• If less than 2 ohms
6. All OK.
Heated Steering Wheel
1. Ignition OFF, disconnect the X1 harness connector at the E15 heated steering wheel.
2. Test for 5322-97072 ohms between the signal terminal D X1 and the ground terminal C X1.
• If not within the specified range
Replace the E15 heated steering wheel.
• If within the specified range
3. Test for 1.5-3.0 ohms between the control circuit terminal A X1 and the ground terminal B X1.
• If not within the specified range
Replace the E15 heated steering wheel.
• If within the specified range
4. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Cruise Control Switch Replacement Service and Repair
* Steering Wheel Airbag Coil Replacement Removal and Replacement
* Control Module References Control Module References for control module replacement, setup, and programming