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Home >> Buick >> 2012 >> Regal Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 331 (Immobilizer System) >> Diagnostic Information and Procedures >> DTC B3935 >> Circuit/System Verification
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Circuit/System Verification

WARNING: This page is about a different car, the 2013 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Replace the suspected inoperative or malfunctioning key.
  2. 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 
  3. All OK.
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