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Home >> Buick >> 2021 >> Envision Preferred, AWD >> Repair and Diagnosis >> Body & Frame >> Ignition Switch/Steering Lock >> Immobilizer System >> Diagnostic Information and Procedures >> DTC B1981 >> Circuit/System Verification
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Circuit/System Verification

  1. Perform the Programming and Setup procedure for the K219 Lighting Control Module.
  2. Verify the DTC does not set after programming.
    • If the DTC sets after programming 

      Replace the K219 Lighting Control Module.

    • Go to next step: If the DTC does not set after programming 
      • NOTE:

      To set the DTC the BCM must see an incorrect response or no response at all for at least 10 seconds of the vehicle switched to RUN or propulsion.

  3. All OK.
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