Test D: The Audio System Illumination Is Inoperative

PINPOINT TEST D: THE AUDIO SYSTEM ILLUMINATION IS INOPERATIVE

D1:

D1-D2:

Normal Operation
Variable voltage is supplied to the audio unit from the instrument panel dimmer switch on 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