Test C: Poor Quality/Distorted/No Sound From One Or More Speakers (Not All Speakers)

PINPOINT TEST C: POOR QUALITY/DISTORTED/NO SOUND FROM ONE OR MORE SPEAKERS (NOT ALL SPEAKERS)

Normal Operation
The audio control module (ACM) directs the audio signals to the speakers through separate positive and negative circuits for each of the 4 audio channels: LH front, RH front, LH rear, and RH rear. The ACM provides internal circuit protection for shorts to ground, shorts to voltage, or shorts between any output circuits. For vehicles equipped with a DVD entertainment system, the audio signals for the rear speakers are sent to the rear entertainment module (RETM), then to the rear speakers.

For the navigation system, if the voice guidance setting is set to zero rather than to off, it may appear that the front speakers intermittently produce no sound. Make sure the voice guidance setting is not set to zero before addressing a concern with the front speakers.

- DTC B2965 (Audio System Speaker Circuit Fault) - sets when an open, a short to ground, or a short to voltage is detected on the front door or rear door speaker circuits. The ACM checks for faults once every 500ms during normal operation. The following should also be noted:
- The Audiophile ACM does not check for opens in the front door speakers.
- The navigation ACM only checks for opens during the on-demand self-test.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Speaker
- RETM (if equipped)
- ACM

C1-C2:

C2-C4:

C4-C6:

C7-C10: