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Home >> Chevrolet >> 2017 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 29 (Immobilizer System) >> Diagnostic Information and Procedures >> DTC B3935 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
  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.

    • Go to next step: 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.

    • Go to next step: If the DTC is not set 
  4. All OK.
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