Circuit/System Testing

Ignition OFF, exterior lamps OFF, trunk latch latched, disconnect the harness connector at the E8S rear compartment courtesy lamp.
Test for less than 5Ω between the ground circuit terminal 2 and ground.
- If 5Ω or greater
1. Ignition OFF.
2. Test for less than 2Ω in the ground circuit end to end.
  - If 2Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2Ω, repair the open/high resistance in the ground connection.
- If less than 5Ω
Connect a test lamp between the control circuit terminal 1 and ground, ignition ON.
Verify the test lamp turns ON and OFF when commanding the Trunk Lamp 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 2Ω in the control circuit end to end.
  - If 2Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2Ω, 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 1V between the control circuit terminal and ground.
  - If 1V or greater, repair the short to voltage on the circuit.
  - If less than 1V, replace the K9 body control module.
- If the test lamp turns ON and OFF
Test or replace the E8S rear compartment courtesy lamp.