Test D: The Audio System Illumination Is Inoperative

PINPOINT TEST D: THE AUDIO SYSTEM ILLUMINATION IS INOPERATIVE

D1:

D1-D2:

D2 Continued:

Normal Operation
When the instrument cluster detects a headlamps ON message, it sends a variable voltage to the audio unit through circuit 19 (LB/RD). The audio unit is grounded through circuit 57 (BK).

Possible Causes
- circuit 19 (LB/RD) open
- circuit 57 (BK) open
- audio unit