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Home >> Hummer >> 2010 >> H3 Alpha >> Repair and Diagnosis >> External Pages >> Different car >> Section 1770 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Video Display Malfunction >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the appropriate DVD display.
  2. Ignition OFF, test for less than 5.0 ohms between the ground circuit terminals listed below and ground.
    • Ground terminal 6
    • Ground terminal 5 (DNU)
    • If greater than specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, DVD playing, test for B+ between the entertainment remote enable B+ circuit terminal 8 and ground.
    • If less than specified value, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
  4. Ignition ON, test for B+ between the battery positive voltage circuit terminal 7 and ground.
    • If less than specified value, test the voltage supply circuit for a short to ground or an open/high resistance.
  5. Ignition ON, DVD playing, test for 1-8 volts between the video bright control circuit terminal 9, and ground.
    • If greater then specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the radio.
    • If less then specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
  6. Ignition ON, DVD playing, test for 0.1-3.0 volts between the video mode signal circuit terminal 10, and ground.
    • If greater then specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
    • If less then specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
  7. Ignition ON, DVD playing, test for 1-3 volts between the video signal (+) circuit terminal 1, and ground.
    • If greater then specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the radio.
    • If less then specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
  8. If all circuits test normal, replace the DVD display.
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