Test D: The Audio System Illumination Is Inoperative

PINPOINT TEST D: THE AUDIO SYSTEM ILLUMINATION IS INOPERATIVE

D1-D2:

Normal Operation
Variable voltage is supplied to the audio unit from the instrument panel dimmer switch on circuit VLN18 (BU/WH). The audio unit is grounded through circuit GD161 (BK/YE).

Possible Causes
- Circuit VLN18 (BU/WH) open
- Circuit GD161 (BK/YE) open
- Audio unit