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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 27 (Supplemental Restraints System) >> Diagnostic Information and Procedures >> DTC B1A7A >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

The Restraints Control Module sets a DTC B1A7A when a communication or internal fault from the A103 Roof Console is detected.

  1. Verify that U0100 - U02FF codes are not present.
    • If U0100 - U02FF codes are present, diagnose before continuing
  2. Verify that DTC B1A7A is not set in the K36 Restraints Control Module.
    • If DTC B1A7A is set in the K36 Restraints Control Module 

      Conduct circuit system testing for short to ground, B+ and Open circuit before replacing A103 Roof Console

    • Go to next step: If DTC B1A7A is not set in the K36 Restraints Control Module 
  3. A fault is not currently present and may be an intermittent condition.
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