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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the M40 Rear Compartment Lid Latch.
  2. Ignition ON, verify the scan tool Trunk Lid/Liftgate Window Exterior Unlatch Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.
  3. Install a 3 A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Trunk Lid/Liftgate Window Exterior Unlatch Switch parameter is Active.
    • If not the specified value, test the signal circuit terminal 4 for a short to voltage or and open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  4. If all circuits test normal, test or replace the M40 Rear Compartment Lid Latch.
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