Test X: Poor Quality/Distorted/No Sound While In SYNC Mode

PINPOINT TEST X: POOR QUALITY/DISTORTED/NO SOUND WHILE IN SYNC MODE

Normal Operation
The accessory protocol interface module (APIM) sends left and right channel analog audio signals through circuits VME52 (BU), RME52 (GY/OG), VME53 (VT/GN), and RME53 (BN/WT). If the vehicle is equipped with a DVD entertainment system, these audio signals are sent to the rear entertainment module (RETM), then to the audio control module (ACM). In vehicles without a DVD entertainment system, the audio signals are sent directly to the ACM.

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

X1:

X1-X4:

X4-X7: