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Circuit/System Testing

WARNING: This page is about a different car, the 2020 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the A23D Front Side Door Latch-Driver. Ignition ON
  2. Test for greater than 4 V between the signal circuit terminal 2 and ground
    • If 4 V or less 
    1. Test circuit 126 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 126 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. Replace the K9 Body Control Module.
    • Go to next step: If greater than 4 V 
  3. Test or replace the A23D Front Side Door Latch-Driver.
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