Test D: The Audio Unit Illumination Is Inoperative

PINPOINT TEST D: THE AUDIO UNIT ILLUMINATION IS INOPERATIVE

D1-D2:

Normal Operation
A variable pulse width modulated (PWM) voltage is supplied to the audio unit through circuit 29S-LK34 (OG/BK). The audio unit is grounded through circuit 31-MD34 (BK).

Possible Causes
- Circuit 29S-LK34 (OG/BK) open
- Circuit 31-MD34 (BK) open
- Audio unit