Circuit/System Testing

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

Vehicle OFF, exterior lamps OFF, disconnect the harness connectors at the components listed below.
- E37F dome/reading lamps - front
- E31L sunshade mirror lamp - left
- E31R sunshade mirror lamp - right
Connect a test lamp between the appropriate control circuit terminal listed below and ground, vehicle in Service Mode.
- E37F dome/reading lamps - front terminal 1
- E31L sunshade mirror lamp - left terminal A
- E31R sunshade mirror lamp - right terminal A
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. Vehicle 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. Vehicle OFF, disconnect the X7 harness connector at the K9 body control module, vehicle in Service Mode.
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.