Mobile Entertainment System Audio Degraded or Inoperative

Mobile Entertainment System Audio Degraded or Inoperative

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview






Circuit/System Description

The rear audio signals and rear audio common circuits are outputs from the mobile entertainment player module. These circuits carry the mobile entertainment audio signals to the disc player and video display.

Diagnostic Aids

This diagnostic assumes that the audio quality is good while playing a DVD or during play of an auxiliary audio source through the mobile entertainment system. This diagnostic also assumes that the audio quality is poor or non-existent only during mobile entertainment system play. Be sure to check for these conditions. Be sure that there is an audio selection available to play via the mobile entertainment cartridge.

Circuit/System Verification

1. Ignition ON.
2. Turn the radio ON. Select the mobile entertainment system as the source.
3. Play a selection on the mobile entertainment system.

Circuit/System Testing

1. Ignition OFF. Disconnect the mobile entertainment player module. Test for continuity in the right and left audio circuits through the audio coupling transformer.

• If there is no continuity through the audio coupling transformer, replace the harness.

2. Test the rear audio signals for a short to ground or short to voltage.
3. Test the rear audio common circuit for an open or short to voltage.
4. Disconnect the disk player and video display. Test for continuity in the right and left audio circuits through the audio coupling transformer.

• If there is no continuity through the audio coupling transformer, replace the harness.

5. Test the rear audio signals for a short to ground or short to voltage.
6. Test the rear audio common circuit for an open or short to voltage.
7. If the circuits test normal, test or replace the mobile entertainment player module.
8. If all circuits test normal, test or replace the disk player and video display.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Mobile Entertainment Data Cartridge Access Lower Door Replacement
* Video Disc Player Replacement Verification Tests