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Liftgate Release Malfunction

  1. Ignition OFF, disconnect the X2 harness connector at the I/P fuse block.
  2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for short to ground or an open/high resistance.
  3. Ignition OFF, connect the X2 harness connector and disconnect the X3 harness connector at the I/P fuse block.
  4. Verify that a test lamp does not illuminate between the control circuit terminal 22 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  5. Disconnect the harness connector at the liftgate latch.
  6. Test for less than 1 ohm between the ground circuit terminal 3 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the liftgate latch.
  8. Ignition ON, connect a 15A fused jumper wire between the control circuit terminal 22 and B+. Verify the liftgate latch activates.
    • If the liftgate latch does not activate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the liftgate latch.
  9. Connect a test lamp between the circuit terminal 20 and ground.
  10. Command the liftgate latch ON and OFF by pressing and releasing the liftgate release switch. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. Connect a test lamp between the control circuit terminal 9 and B+.
  12. Command the liftgate latch ON and OFF by pressing and releasing the liftgate release switch. The test lamp should turn ON and OFF while changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  13. If all circuits test normal, replace the I/P fuse block.
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