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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1549 (Cellular Systems, Entertainment Systems & Navigation Systems) >> Diagnostic Information and Procedures >> Video Display Malfunction >> Circuit/System Testing
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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.
  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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