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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 449 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Dual DVD Rear Seat Entertainment Headrest Display Inoperative - One or More >> Circuit/System Testing

Circuit/System Testing

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One Display Inoperative (Dual Display)

  1. Turn ON the ignition, press the power button on the suspect display. Verify the suspect DVD display does not power up.
    • If the DVD display powers up but the screen is blank and will not play any DVDs, replace the DVD display.
  2. At the DVD control module, touch a test lamp at the back of the suspect black or red connector between terminal 6 and ground. Verify that a test lamp illuminates between terminal 6 and ground.
    • If the test lamp does not illuminate, replace the DVD control module.
  3. At the DVD control module, touch a test lamp at the back of the suspect black or red connector between terminal 5 and B+. Verify that a test lamp illuminates between terminal 5 and B+.
    • If the test lamp does not illuminate, replace the DVD control module.
  4. Disconnect the suspect black or red connector from the suspect DVD display. At the black or red DVD display connector, Test for B+ at terminal 6.
    • If B+ is not present replace the DVD display harness.
  5. At the black or red DVD display connector, test for less than 1.0 ohm between the ground circuit terminal 5 and ground.
    • If greater than the specified range, replace the DVD display harness.
    • If all circuits test normal replace the suspect DVD display.

Display Inoperative (Single Display) or Both Displays Inoperative (Dual Display)

  1. Turn ON the ignition, press the power button on both suspect displays. Verify the suspect DVD displays do not power up.
    • If the DVD display powers up but the screen is blank and will not play any DVDs, replace the suspect DVD display.
  2. Disconnect the 2 wire connector from the DVD control module. At the 2 wire harness connector, test for less than 1.0 ohm between the ground circuit terminal and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. At the DVD control module 2 wire harness connector, verify that a test lamp illuminates between the B+ circuit terminal and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Reconnect the 2 wire harness connector at the DVD control module
  5. At the DVD control module, touch a test lamp at the back of the black or red connector between terminal 1 and ground. Verify that a test lamp illuminates between terminal 1 and ground.
    • If the test lamp does not illuminate, replace the DVD control module.
  6. At the DVD control module, touch a test lamp at the back of the suspect black or red connector between terminal 2 and B+. Verify that a test lamp illuminates between terminal 2 and B+.
    • If the test lamp does not illuminate, replace the DVD control module.
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