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.
Diagnostic Fault Information
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 ground to the indicator lamp and supplies voltage to the heating elements, which are internal to the steering wheel. The heated steering wheel temperature is monitored through an internal temperature sensor. When the steering wheel reaches operating temperature the module will cycle the voltage on and off to maintain the operating temperature.
Reference Information
Schematic Reference
Steering Wheel Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
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 5.0 ohm between the ground terminal 6 and ground.
• If greater than the specified value, test the ground circuit for an open/high resistance.
3. Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 5 and ground.
• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
4. Install a 3 A fused jumper wire between the indicator control circuit terminal 1 and B+. Verify the heated steering wheel indicator is illuminated.
• If the indicator does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the S70L steering wheel control switch.
5. Connect a test lamp between the control circuit terminal 4 and B+.
6. Observe the test light while applying and releasing the heated steering wheel switch. The test lamp should turn ON and OFF when applying and releasing the switch.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the S70L steering wheel control switch.
• If the test lamp is always OFF, test the control circuit for an open/high resistance. If the circuit tests normal, replace the S70L steering wheel control switch.
7. Test for less than 15000 ohm between the control circuit terminal 7 and ground.
• If greater than the specified value, test the control circuit for an open/high resistance. If the circuit test normal, test or replace the E15 heated steering wheel.
8. Ignition OFF, connect the at the heated steering wheel control module. Disconnect the harness connector at the heated steering wheel.
9. Test for less than 5 ohm between the ground circuit terminal A and ground.
• If greater than the specified value, test the ground circuit for an open/high resistance.
10. Test for less than 10 ohm between the signal circuit terminal C and ground.
• If greater than the specified value, test the signal circuit for an open/high resistance. If the circuit test normal, test or replace the K32 heated steering wheel control module.
11. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal D 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 K32 heated steering wheel control module.
• If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the K32 heated steering wheel control module.
12. If all circuits test normal, test or replace the K32 heated steering wheel control module.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Control Module References (Programming and Relearning)for heated steering wheel control module replacement, setup, and programming.
* Steering Wheel Replacement (Steering Wheel Replacement)
* Steering Wheel Control Switch Assembly Replacement (Service and Repair)