Test D: The Steering Wheel Control Switches Illumination Is Inoperative

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

D1-D2:

D2-D3:

D4-D6:

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).

Possible Causes
- circuit 57 (BK) open
- circuit 484 (OG/BK) open or short to ground
- audio/climate control switch
- speed control switch
- steering wheel wiring harness
- clockspring