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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1549 (Cellular Systems, Entertainment Systems & Navigation Systems) >> Diagnostic Information and Procedures >> Dual DVD Rear Seat Entertainment Headrest Video Does Not Synchronize >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. 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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