Circuit/System Testing

WARNING: This page is about a different car, the 2021 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, disconnect the harness connectors at the components listed below.
- A3L Sunshade - Left
- A3R Sunshade - Right
- A98 Front Overhead Console Assembly
- E27 Instrument Panel Compartment Lamp
- E37M Dome/Reading Lamps - Middle
- E37R Dome/Reading Lamps - Rear
Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
- A3L Sunshade - Left terminal A
- A3R Sunshade - Right terminal A
- A98 Front Overhead Console Assembly terminal 7
- E27 Instrument Panel Compartment Lamp terminal 1
- E37M Dome/Reading Lamps - Middle terminal 4
- E37R Dome/Reading Lamps - Right Rear terminal 4
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.
  - Go to next step: 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.
- Go to next step: If the test lamp turns ON and OFF
Test or replace the appropriate courtesy lamp.