Test F: The Instrument Panel Illumination Does Not Dim

PINPOINT TEST F: THE INSTRUMENT PANEL ILLUMINATION DOES NOT DIM

F1-F3:

F4-F7:

Normal Operation
The lighting control module (LCM) supplies a variable pulse width modulated (PWM) voltage to the instrument panel switches through circuit 484 (OG/BK). The LCM uses the instrument panel dimmer switch to determine the intensity of switch illumination.

Possible Causes
- circuit 57 (BK) open
- circuit 484 (OG/BK) short to voltage
- circuit 1036 (BR/WH) open, short to ground, or short to voltage
- instrument panel dimmer switch
- LCM