Test D: The Audio System Illumination Is Inoperative

PINPOINT TEST D: THE AUDIO SYSTEM ILLUMINATION IS INOPERATIVE

D1:

D1-D2:

Normal Operation
A variable pulse width modulated (PWM) voltage is supplied from the instrument panel dimmer switch to the audio unit on circuit 19 (LB/RD). Ground for the audio unit illumination is through circuit 57 (BK).

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