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Home >> Cadillac >> 2006 >> Escalade EXT >> Repair and Diagnosis (Single Page) >> External Pages >> Different car >> Section 1914 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Video Entertainment System Malfunction (X88/Z88) >> Circuit/System Testing
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Circuit/System Testing

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Without DNU

  1. Ignition OFF, disconnect the harness connector at the DVD display.
  2. Test for less than 5.0 ohms between the ground circuit terminal 6 and ground.
    • 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 40 mV -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 OFF, disconnect the X3 harness connector at the radio.
  8. Test for less than 5 ohms between the DVD display terminal 1 and the radio X3 harness connector terminal 7.
    • If greater than specified range, test the ground circuit for an open/high resistance.
  9. If all circuits test normal, replace the DVD display.
  10. Ignition ON, DVD playing, Verify the DVD display operates normally.
    • If the DVD display does not operate normally, replace the radio.

With DNU - One Display Not Functioning

  1. Ignition OFF, disconnect the harness connector at the appropriate DVD screen.
  2. Test for less than 5.0 ohms between the ground circuit terminal 6 and ground.
    • 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 video signal splitter.
  4. 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 video signal splitter.
    • 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 video signal splitter.
  6. Ignition ON, DVD playing, test for 40 mV-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 video signal splitter.
    • 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 video signal splitter.
  7. Ignition OFF, disconnect the appropriate harness connector at the video signal splitter.
    • Front Display- X2
    • Rear Display (DNU)- X3
  8. Test for less than 5 ohms between the DVD display terminal 1 and the video signal splitter harness connector terminal 1.
    • If greater than specified range, test the ground circuit for an open/high resistance.
  9. If all circuits test normal, replace the DVD display.
  10. Ignition ON, DVD playing, verify the DVD display operates normally.
    • If the DVD display does not operate normally, replace the radio.

With DNU - Two Displays Not Functioning

  1. Ignition OFF, disconnect the X1 harness connector at the video signal splitter.
  2. Test for less than 5.0 ohms between the ground circuit terminal 2 and ground.
    • 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 11 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. Test for B+ between the battery positive voltage circuit terminal 6 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 8, 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 40 mV-3.0 volts between the video mode signal circuit terminal 16, 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 OFF, disconnect the X3 harness connector at the radio.
  8. Test for less than 5 ohms between the video signal splitter X1 terminal 1 and the radio X3 harness connector terminal 7.
    • If greater than specified range, test the ground circuit for an open/high resistance.
  9. If all circuits test normal, perform the circuit/system testing with DNU -- One Display Not Functioning for each display.
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