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Circuit/System Testing

WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the B55 hood ajar switch.
  2. Ignition OFF, test for less than 5 Ω between the ground circuit terminal C and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify DTC B3006 04 is set as current.
    • If DTC B3006 01 is set as current, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
    • If DTC B3006 02 is set as current, test the signal circuit for a short to ground. If the circuit tests normal, replace the K9 BCM.
  4. Install a 5 A fused jumper wire between the signal circuit terminal B and ground. Verify DTC B3006 02 is set as current.
    • If DTC B3006 04 is set as current, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  5. If all circuits test normal, test or replace the B55 hood ajar switch.
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