Pinpoint Test 3: Poor Quality/Distorted/No Sound From All Speakers

PINPOINT TEST 3: POOR QUALITY/DISTORTED/NO SOUND FROM ALL SPEAKERS

Normal Operation

When the key is in START, voltage is supplied to the audio control module (ACM) through the START sense circuit. When the ACM receives this voltage, it mutes the speaker output to prevent popping in the speakers as a result of voltage spikes during engine cranking, However, if there is a short to voltage on this circuit, the ACM continuously mutes the audio output, resulting in no sound from all speakers.

Possible Causes
- Wiring, terminals or connectors
- ACM

Diagnostic Procedure

CAUTION:Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.