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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Wiring Systems And Power Management - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC B1B42 >> Circuit/System Testing

Circuit/System Testing

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.
  1. Verify DTC B1B15 2A is not set.
    • If DTC B1B15 2A is set 

      Replace the S38 On/Off Vehicle Switch.

    • Go to next step: If DTC B1B15 2A is not set 
  2. Verify DTC B1B15 is not set.
    • Go to next step: If DTC B1B15 is not set 
  3. Verify DTC B1A76 is not set.
    • Go to next step: If DTC B1A76 is not set 
  4. Replace the S38 On/Off Vehicle Switch.
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