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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1104 (Door Lock Systems & Door Handles) >> Diagnostic Information and Procedures >> Trunk Ajar Indicator Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, trunk OPEN, observe the scan tool rear closure ajar switch parameter. The scan tool should display ACTIVE and the TRUNK OPEN indicator should be ON.
    • If the scan tool displays ACTIVE and the TRUNK OPEN indicator is not ON, replace the IPC.
  2. Ignition ON, trunk CLOSED, observe the scan tool rear closure ajar switch parameter. The scan tool should display INACTIVE and the TRUNK OPEN indicator should be OFF.
    • If the scan tool displays INACTIVE and the TRUNK OPEN indicator is ON, replace the IPC.
  3. Ignition OFF, disconnect the harness connector at the rear compartment lid latch.
  4. Ignition OFF, test for less than 5.0 ohms of resistance between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  5. Ignition ON, verify the scan tool rear closure ajar switch parameter is INACTIVE.
    • If not the specified value, test the signal circuit terminal C for a short to ground. If the circuit tests normal, replace the BCM.
  6. Install a 3A fused jumper between the signal circuit terminal C and ground. Verify the scan tool rear closure ajar switch parameter is ACTIVE.
    • If not the specified value, test the signal circuit terminal C for a short to voltage or and open/high resistance. If the circuit tests normal, replace the BCM.
  7. If all circuits test normal, test or replace the rear compartment lid latch.
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