Diesel Data: Automotive Repair

Test F

PINPOINT TEST F: NO SOUND FROM ONE OR MORE SPEAKERS (NOT ALL SPEAKERS)


Test F1-F2:






Test F2-F4:






Normal Operation
The audio unit directs the audio signals to the speakers through separate positive and negative circuits for each of the four audio channels LF, RF, LR, and RR. The audio unit provides internal circuit protection for shorts to ground, shorts to B+ battery or shorts between any output circuits.

Possible Causes
- speaker(s)
- audio unit
- speaker circuit(s) open or short to ground