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.

Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the A23RR Rear Side Door Latch-Right.
Verify a test lamp illuminates between ground circuit terminal 9 and B+.
- If the test lamp does not illuminate
1. Repair the open/high resistance on circuit 2450 or the ground connection.
- Go to next step: If the test lamp illuminates
Ignition ON, Vehicle in Service Mode
Test for greater than 7 V between the signal circuit terminal 8 and ground
- If 7 V or less
1. Test circuit 6654 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 6654 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 7 V
Test or replace the A23RR Rear Side Door Latch-Right