Test J: Poor Quality/Distorted/No Sound From All Speakers - Navigation

PINPOINT TEST J: POOR QUALITY/DISTORTED/NO SOUND FROM ALL SPEAKERS - NAVIGATION

J1:

J1-J3:

J4:

Normal Operation
The audio unit sends an enable signal to the audio amplifier through circuit 173 (DG/VT). The audio amplifier receives voltage through circuit 720 (RD/YE) and ground through circuit 694 (BK/LG).

Possible Causes
- Fuse
- Circuit 173 (DG/VT) open
- Circuit 694 (BK/LG) open
- Circuit 720 (RD/YE) open
- Audio amplifier
- Audio unit