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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 B1AC3 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the connector at the S38 On/Off Vehicle Switch.
    2. NOTE:

    If the amber accessory indicator is functioning the next step does not need to be performed.

  2. Verify a test lamp illuminates between ground circuit terminal 3 and B+.
    • If the test lamp does not illuminate 

      Repair the open/high resistance on circuit 1351 or ground connection.

    • Go to next step: If the test lamp illuminates 
  3. Connect the connector at the S38 On/Off Vehicle Switch.
  4. Ignition On, Vehicle Accessory Mode.
  5. Disconnect connector at the S38 On/Off Vehicle Switch and connector X3 at the K9 Body Control Module.
  6. Test less than 1 V Between control circuit terminal 1 and ground circuit terminal 3
    • Go to next step: If 1 V or greater 

      Go to next step: Repair the short to voltage on circuit 5719.

    • Go to next step: If less than 1 V 
  7. Replace the K9 Body Control Module.
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