Test D: The Audio System Illumination Is Inoperative

PINPOINT TEST D: THE AUDIO SYSTEM ILLUMINATION IS INOPERATIVE

D1:

D1-D2:

Normal Operation
With the parking lamps on, the lighting control module (LCM) supplies a variable pulse width modulated (PWM) voltage to the audio unit on circuit 484 (OG/BK). The base audio unit illumination is grounded through circuit 57 (BK). The dual media audio unit is grounded through circuit 694 (BK/LG).

Possible Causes
- circuit 57 (BK) open
- circuit 484 (OG/BK) open
- circuit 694 (BK/LG) open
- audio unit