Test D: The Steering Wheel Control Switch Illumination Is Inoperative

PINPOINT TEST D: THE STEERING WHEEL CONTROL SWITCH ILLUMINATION IS INOPERATIVE

Normal Operation
The lighting control module (LCM) supplies a variable pulse-width modulated (PWM) voltage to the steering wheel control switches through circuit 484 (OG/BK). The steering wheel control switches are grounded through circuit 57 (BK).

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Audio/climate control switch
- Speed control switch
- Steering wheel wiring harness
- Clockspring

D1:

D1-D3:

D3-D5:

D6: