Circuit/System Testing

WARNING: This page is about a different car, the 2013 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, exterior lamps OFF, disconnect the harness connectors at the components listed below.
- E27 instrument panel compartment lamp
- E31L sunshade - left
- E31R sunshade - right
- E37D dome/reading lamps - overhead console
- E37R dome/reading lamps - rear
Connect a test lamp between the appropriate control circuit terminal listed below and ground.
- E27 instrument panel compartment lamp terminal 1
- E31L sunshade mirror lamp - left terminal A
- E31R sunshade mirror lamp - right terminal A
- E37D dome/reading lamps - overhead console terminal 1
- E37R dome/reading lamps - rear terminal 1
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 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 courtesy lamp.