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Home >> Cadillac >> 2018 >> CTS Base, AWD >> Repair and Diagnosis >> Body & Frame >> Ignition Switch/Steering Lock >> Immobilizer System >> Diagnostic Information and Procedures >> DTC B3900 >> Circuit/System Verification
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Circuit/System Verification

  1. Ignition ON.
  2. Verify DTC B3900 is not set.
    • If DTC B3900 is set 
    1. Perform the SPS Setup procedure for the K178 Active Safety External Communication Control Module.
    2. Verify the DTC does not set.
      • If the DTC is set, replace the K178 Active Safety External Communication Control Module.
      • Go to next step: If the DTC does not set
    3. All OK
    • Go to next step: If DTC B3900 is not set 
  3. All OK
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