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Home >> Chevrolet >> 2012 >> Camaro LS, Automatic Trans >> Repair and Diagnosis >> Body & Frame >> Ignition Switch/Steering Lock >> Immobilizer System >> Diagnostic Information and Procedures >> DTC B2955 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the K89 Immobilizer Control Module. It may take up to two minutes for all vehicle systems to power down.
  2. Verify a test lamp illuminates between the low reference circuit terminal 1 and B+.
    • If the test lamp does not illuminate 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If the test lamp illuminates 
  3. Ignition ON.
    4. NOTE:

    In some instances, the K9 Body Control Module may only apply voltage for three seconds immediately after the ignition is turned ON. It may be necessary to monitor the DMM while turning the ignition ON to observe the voltage.

  4. Test for greater than 9 V between the ignition circuit terminal 3 and ground.
    • If 9 V or less 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If greater than 9 V 
  5. Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON.
  6. Test for less than 1 V between the K89 Immobilizer Control Module serial data circuit terminal 2 and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  7. Replace the K89 Immobilizer Control Module.
  8. Verify DTC B2955 does not set while operating the vehicle under the conditions for running the DTC.
    • If DTC B2955 is set 

      Replace the K9 Body Control Module.

    • If DTC B2955 is not set 
  9. All OK.
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