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.

Schematic Reference

Steering Wheel Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Steering Wheel and Column Description and Operation

Electrical Information Reference

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

1. Ignition OFF, disconnect the harness connector at the heated steering wheel control module.
2. Test for less than 5.0 ohms between the ground terminal B X1 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 voltage terminal A X1 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, connect a test lamp between the signal circuit terminal B X2 and B+. Place the heated steering wheel switch in the OFF position.

⇒	If the test lamp illuminates, test the signal circuit for a short to ground, If all circuits test normal, test or replace the heated steering wheel control switch.

5. Connect a test lamp between the signal circuit terminal B X2 and B+. Place the heated steering wheel switch in the ON position.

⇒	If the test lamp does not illuminate, test the signal circuit for a short to voltage or open/high resistance and test the ground circuit for an open/high resistance. If all circuits test normal, test or replace the heated steering wheel control switch.

6. Verify that a test lamp does not illuminate between the control circuit terminal A X1 and ground.

⇒	If the test lamp illuminates, test for a short to voltage on the heated steering wheel element control circuit.

7. Test for 1.5-3.0 ohms between the control circuit terminal A and the ground terminal B.

⇒	If not within the specified range, test the heating element control circuit for a short to ground or open/high resistance and the ground circuit for an open/high resistance. If all circuits test normal, replace the heated steering wheel control module.

8. Verify that a test lamp does not illuminate between the signal circuit terminal C and ground.

⇒	If the test lamp illuminates, test for a short to voltage on the heated steering wheel element signal circuit.

9. Test for 6000-35000 ohms between the signal circuit terminal C and the ground circuit terminal D.

⇒	If not within the specified range, test for an open/high resistance in the low reference circuit. If the circuit tests normal, replace the heated steering wheel.

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

Heated Steering Wheel Control Switch

1. Place the heated steering wheel control switch in the OFF position.
2. Test for infinite resistance between terminal 4 and terminal 5.

⇒	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 4 and terminal 5.

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.