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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 B67A ultrasonic intrusion sensor 1.
  2. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test the signal circuit for a short to ground.
  3. Connect the harness connector at the B67A ultrasonic intrusion sensor 1. Disconnect the harness connector at the B67B ultrasonic intrusion sensor 2.
  4. Verify a test lamp illuminates between the signal circuit terminal 1 and ground.
    • 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 B67A ultrasonic intrusion sensor 1.
  5. Connect the harness connector at the B67B ultrasonic intrusion sensor 2. Disconnect the X6 harness connector at the K9 BCM.
  6. Verify a test lamp illuminates between the signal circuit terminal 13 and ground.
    • 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 B67B ultrasonic intrusion sensor 2.
  7. If all circuits test normal, test or replace the K9 BCM.
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