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Home › Buick › 2011 › Regal CXL › Repair and Diagnosis › Body & Frame › Ignition Switch/Steering Lock › Immobilizer System › Diagnostic Information and Procedures › DTC B2955 › Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the K89 immobilizer control module.
  2. Ignition OFF, test for less than 10 Ω between the low reference circuit terminal 1 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  3. Ignition ON, test for B+ between the B+ circuit terminal 3 and ground.
    • If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  4. Test for 12-13 V between the serial data circuit terminal 2 and ground.
    • If less than the specified range, test the serial data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
    • If greater than the specified range, test the serial data circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
  5. If all circuits test normal, replace the K89 immobilizer control module. Verify DTC B2955 is not set.
    • If the DTC is set, replace the K9 BCM.
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