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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1768 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Dual DVD Rear Seat Entertainment Headrest Display Malfunction >> Circuit/System Testing
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Circuit/System Testing

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One Display Inoperative

  1. Ignition OFF, disconnect the X1 harness connector at the appropriate display.
  2. Ignition ON, test for less than 5 Ω between the ground circuit terminal 5 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the DVD control module.
  3. Ignition ON, test for B+ between the ignition voltage circuit terminal 6 and ground.
    • If less than the specified value, B+ circuit for an open/high resistance. If the circuit tests normal, replace the DVD control module.
  4. Ignition OFF, reconnect the X1 harness connector, and disconnect the X2 harness connector at the display.
  5. Ignition ON, test for 4.5-5.5 V between the terminals listed below and ground:
    • I2C Clock Signal - terminal 5
    • I2C Data - terminal 6
    • If less than specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the DVD control module.
    • If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the DVD control module.
  6. If all circuits test normal, replace the appropriate display.

Both Displays Inoperative

  1. Ignition OFF, disconnect the X1 harness connector at the DVD control module.
  2. Test for less 5 Ω between the ground circuit terminal 3 and ground.
    • If the greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for B+ between the accessory voltage circuit terminal and ground.
    • If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance.
  4. Ignition OFF, Reconnect the X1 harness connector at the DVD control module
  5. Disconnect the X1 harness connector at the driver seat headrest.
  6. Ignition ON, test for less than 5 Ω between the ground circuit terminal 5 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the DVD control module.
  7. Ignition ON, test for B+ between the ignition voltage circuit terminal 6 and ground.
    • If less than the specified value, B+ circuit for an open/high resistance. If the circuit tests normal, replace the DVD control module.
  8. Ignition OFF, reconnect the X1 harness connector, and disconnect the X2 harness connector at the display.
  9. Ignition ON, test for 4.5-5.5 V between the terminals listed below and ground:
    • I2C Clock Signal - terminal 5
    • I2C Data - terminal 6
    • If less than specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the DVD control module.
    • If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the DVD control module.
  10. If all circuits test normal, replace the appropriate display.
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