Test C: Poor Quality/Distorted/No Sound From One Or More Speakers (Not All Speakers) - THX(R) Audio System

PINPOINT TEST C: POOR QUALITY/DISTORTED/NO SOUND FROM ONE OR MORE SPEAKERS (NOT ALL SPEAKERS) - THX(R) AUDIO SYSTEM

C1-C2:

C2-C5:

C5-C6:

C6-C7:

C7-C8:

C8 Continued:

C9-C11:

Normal Operation
The audio unit directs the audio signals to the THX(R) amplifier, which processes the audio signals and sends them to the speakers. Each speaker has a signal and return circuit.

DTC B1158 - sets when an open is detected in the RH subwoofer circuit.

DTC B2913 - sets when an open is detected in the LH subwoofer circuit.

DTC B2925 - sets when a short to ground or voltage is detected in the LH subwoofer circuit.

DTC B292A - sets when a short to ground or voltage is detected in the RH subwoofer circuit.

DTC B2965 - sets when an open, a short to ground, or a short to voltage is detected in the front door or rear door speaker circuits. The following should also be noted:
- When the DTC is set by the audio unit, the fault can be isolated to the circuitry between the audio unit and the THX(R) amplifier.
- When the DTC is set by the THX(R) amplifier, the fault can be isolated to the circuitry between the THX(R) amplifier and the speakers.
- The audio unit does not check for opens.

Possible Causes
- Fuse
- Circuitry
- Speaker
- Subwoofer
- THX(R) amplifier
- Audio unit