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 connector at the appropriate component:
- E27 Instrument Panel Compartment Lamp
- E28 Front Floor Console Compartment Lamp
Connect a test lamp between terminal 1 and terminal 2 at the appropriate component:
- E27 Instrument Panel Compartment Lamp
- E28 Front Floor Console Compartment Lamp
Verify the test lamp turns ON and OFF when commanding the Inadvertent Load ON and OFF with a scan tool.
- If the test lamp is always ON
1. Test circuit 4786 for a short to voltage
  - If a short to voltage is found, repair the fault.
  - Go to next step: If a short to voltage is not found
2. Replace the K9 Body Control Module
- If the test lamp is always OFF
1. Test circuit 1450 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
2. Test circuit 4786 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 circuit 4786 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
4. Replace the K9 Body Control Module.
- Go to next step: If the test lamp turns ON and OFF
Replace the appropriate component:
- E27 Instrument Panel Compartment Lamp
- E28 Front Floor Console Compartment Lamp