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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 183 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Dual DVD Rear Seat Entertainment Headrest Video Does Not Synchronize >> Circuit/System Testing

Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: Before performing this diagnostic verify that both DVD displays turn on and operate normally. If one or more displays are inoperative, go to Dual DVD Rear Seat Entertainment Headrest Display Inoperative - One or More .
  1. Turn ON the ignition, press the power button on one of the displays and insert a DVD. Operate the DVD player in play mode.
  2. Press the power button on the other display. Press the source button to view the DVD video playing on the adjacent display. Verify that the video displays do not synchronize.
    • Test or repair the suspect video in/out signal circuit for a short to B+, short to ground or open circuit. If all circuits test normal replace the DVD control module.
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