Circuit/System Testing

WARNING: This page is about a different car, the 2012 Buick Verano. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Each component with backlighting may need to be disconnected to isolate a short to voltage or short to ground. Use the schematics to identify the following:

Backlighting components the vehicle is equipped with
Each component's control and ground circuit terminals
Component locations on the backlighting control circuit

Ignition OFF, exterior lamps OFF, disconnect the harness connectors at the component with the inoperative LED backlighting.
Connect a test lamp between the appropriate control circuit terminal listed below and ground.
- E1D accent lamp - driver door - terminal 1
- E1P accent lamp - passenger door - terminal 1
- E1Q accent lamp - console cupholder left - terminal 1
- E1S accent lamp - console cupholder right - terminal 1
Verify the test lamp turns ON and OFF when commanding the Accent Lighting ON and OFF with a scan tool.
- If the test lamp is always OFF
1. Ignition OFF, disconnect the X7 harness connector at the K9 body control module.
2. Test for infinite resistance between the control circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance
3. Test for less than 2 Ω in the control circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the K9 body control module.
- If the test lamp is always ON
1. Ignition OFF, disconnect the X7 harness connector at the K9 body control module, ignition ON.
2. Test for less than 1 V between the control circuit terminal and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the K9 body control module.
- If the test lamp turns ON and OFF
Test or replace the appropriate E1 accent lamp.