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.

Ignition OFF, disconnect the X1 connector at the K9 Body Control Module, ignition ON:
Verify the appropriate accent/courtesy lamps are not illuminated:
- E8VA Front Floor Courtesy Lamp - Left
- E8VC Front Floor Courtesy Lamp - Right
- If an accent/courtesy lamp is illuminated
  Repair the short to voltage on circuit 7558.
- Go to next step: If all accent/courtesy lamp are not illuminated
Connect a 3 A fused jumper wire between B+ and circuit terminal 4 at the X1 connector.
Verify the appropriate accent/courtesy lamps are illuminated.
- If the accent/courtesy lamp is not illuminated and the jumper fuse is OK.
1. Test the appropriate circuit for an open/high resistance:
  - E8VA Front Floor Courtesy Lamp - Left - 1350
  - E8VC Front Floor Courtesy Lamp - Right - 1450
  - If an open/high resistance is found, repair the fault on the circuit or ground connection.
  - Go to next step: If an open/high resistance is not found.
2. Test circuit 7558 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 appropriate accent/courtesy lamp.
- If the accent/courtesy lamp is not illuminated and the jumper fuse is open
1. Test circuit 7558 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. Replace the appropriate accent/courtesy lamp.
- Go to next step: If the accent/courtesy lamp is illuminated
Replace the K9 Body Control Module.