Test D: The Audio System Illumination Is Inoperative
PINPOINT TEST D: THE AUDIO SYSTEM ILLUMINATION IS INOPERATIVED1-D2:
Normal Operation
Expedition
The instrument panel dimmer switch generates a variable pulse width modulated (PWM) voltage which is distributed to the audio unit on circuit 19 (LB/RD). The audio unit is grounded through circuit 57 (BK).
Navigator
The instrument panel dimmer switch generates a pulse width modulated (PWM) voltage which is sent to the instrument cluster on circuit 505 (GY/YE). The instrument cluster distributes the PWM voltage to the audio unit through circuit 235 (RD/BK), or circuit 19 (LB/RD) for vehicles with a navigation system. The audio unit is grounded through circuit 57 (BK) or circuit 694 (BK/LG) (Navigator with a navigation system).
Possible Causes
- circuit 19 (LB/RD) open
- circuit 57 (BK) open
- circuit 235 (RD/BK) open
- circuit 694 (BK/LG) open
- audio unit