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Home >> Cadillac >> 2008 >> Escalade AWD >> Repair and Diagnosis >> Body & Frame >> Exterior Body Panels >> Bolted Exterior Body Panels And Closures >> Diagnostic Information and Procedures >> Power Tonneau Cover Malfunction >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the receiver module.
  2. Test for less than 10 ohms between the ground circuit terminals 9 and 16 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Verify that a test lamp illuminates between the B+ circuit terminals 1 and 18 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Connect the harness connector at the receiver module.
  5. Disconnect the harness connector at the master motor.
  6. Test for less than 10 ohms between the ground circuit terminal 2 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  8. Connect a test lamp between the wake up signal circuit terminal 5 and ground.
  9. Press the key fob open button. The test lamp should illuminate.
    • If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the receiver module.
  10. Connect a test lamp between B+ and the open signal circuit terminal 11.
  11. Press the key fob open button. The test lamp should illuminate.
    • If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the receiver module.
  12. Connect a test lamp between B+ and the close signal circuit terminal 12.
  13. Press the key fob close button. The test lamp should illuminate.
    • If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the receiver module.
  14. Disconnect the harness connector at the slave motor.
  15. Test for less than 10 ohms between the ground circuit terminal 9 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  16. Verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  17. Test for less than 2 ohms between the master motor X Bus circuit terminal 6 and slave motor X Bus circuit terminal 1.
  18. If all circuits test normal replace the master and slave motors.
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