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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 103 (Antilock Brake System) >> Diagnostic Information and Procedures >> Automatic Vehicle Hold Malfunction >> 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. Ignition OFF, disconnect the connector at the S86 Vehicle Stability Control System Switch.
  2. Verify a test lamp illuminates between terminal 6 and B+
    • If the test lamp does not illuminate 

      Repair the open/high resistance on circuit 1450 or the ground connection.

    • Go to next step: If the test lamp illuminates 
  3. Ignition ON.
  4. Test for more than 5V between terminal 3 and ground
    • If less than 5V 
    1. Test circuit 1428 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Test circuit 1428 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found
    3. Test or replace the S86 Vehicle Stability Control System Switch.
    4. Verify the DTC does not set
      • If the DTC sets

        Replace the K9 Body Control Module

      • Go to next step: If the DTC does not set
    5. All OK.
    • Go to next step: If more than 5V 
  5. Test or replace the S86 Vehicle Stability Control System Switch.
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