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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1819 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Video Display Malfunction >> Circuit/System Testing
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Circuit/System Testing

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  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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