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Home >> Buick >> 2017 >> Envision Base >> Repair and Diagnosis >> Body & Frame >> Ignition Switch/Steering Lock >> Immobilizer System >> Diagnostic Information and Procedures >> DTC B3935: Transponder Authentication >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. Verify the scan tool Immobilizer Allows Engine to Start parameter is Valid when using each vehicle key.
    • If Authentication Error 
      NOTE:

      Perform the appropriate key procedures for this vehicle. Not all vehicle models and years are the same.

      Replace the keys.

    • If Valid 
  3. Verify DTC B3935 does not set while operating the vehicle under the conditions for running the DTC.
    • If the DTC is set 

      Replace the K9 Body Control Module.

    • If the DTC is not set 
  4. All OK.
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