GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 Avalanche - 2WD 🢒 Driver Information and Entertainment 🢒 Cellular, Entertainment, and Navigation 🢒 Dual DVD Rear Seat Entertainment Headrest Audio Malfunction

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit Description

The infrared transmitter is internal to the DVD display and is grounded and powered by the DVD control module. When listening to the headphones, the infrared transmitter sends an infrared signal to the headphones. There are two channels on the headphones, the first channel is dedicated to the driver side video screen, and the other channel is dedicated to the passenger side. The audio that is sent over the DVD audio signal circuits is a varying AC voltage.

Reference Information

Schematic Reference

Video System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Video Entertainment System Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

Dual DVD Rear Seat Entertainment Audio Malfunction -- With FM Antenna

  1. Turn ON the ignition, tune the radio to station 88.3, 88.7, 89.1, 89.5, 89.9, or 90.3MHz. Chose the station that has the least amount of regular audible radio reception.
  2. Headrest DVD displays ON, insert a DVD and operate the DVD player in play mode.
  3. DVD playing, DVD Surround Sound ON, set the DVD Player to the same station as the radio. Verify audio can be heard through the radio.
    4. ⇒If the DVD audio can be heard review the system operation with the customer.
  4. Verify the DVD player is in play mode.
  5. At the DVD control module, test for AC voltage between terminal 6 and terminal 3 or 4 with a DMM at the back of the black or red connector.
    6. ⇒If AC voltage is present replace the DVD control module.
  6. Turn the DVD player off and disconnect both connectors from the DVD display that was playing the DVD.
  7. Swap the two connectors on the display and swap the two corresponding connectors at the DVD control module. Verify the DVD audio now operates normally.
    8. ⇒If the DVD audio now operates normally, replace the DVD display harness.
    ⇒It the DVD audio is still inoperative replace the suspect DVD display.

Dual DVD Rear Seat Entertainment Audio Malfunction -- w/o FM Antenna

  1. Turn ON the ignition, tune the radio to station 88.3, 88.7, 89.1, 89.5, 89.9, or 90.3MHz. Chose the station that has the least amount of regular audible radio reception.
  2. Press the power button on the headrest DVD displays. Insert a DVD and operate the DVD player in play mode. Verify the DVD audio is distorted on one of the above stations.
    3. ⇒If the DVD audio can be heard review the system operation with the customer.
  3. Turn the DVD player off and disconnect both connectors from the DVD display that was playing the DVD.
  4. Swap the two connectors on the display and swap the two corresponding connectors at the DVD control module. Verify the DVD audio now operates normally.
    5. ⇒If the DVD audio now operates normally, replace the DVD display harness.
    ⇒If the DVD audio distortion persists, replace the DVD control module.