Circuit/System Testing

Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate component listed below. It may take up to 2 min for all vehicle systems to power down.
- E13LA Headlamp Assembly - Left
- E13RA Headlamp Assembly - Right
- E69L Multifunction Lamp Assembly - Front Fascia Left
- E69R Multifunction Lamp Assembly - Front Fascia Right
Test for less than 10 Ω between the appropriate ground circuit terminal listed below and ground.
- E13LA Headlamp Assembly - Left terminal 1 and terminal 4
- E13RA Headlamp Assembly - Right terminal 1 and terminal 4
- E69L Multifunction Lamp Assembly - Front Fascia Left terminal 1
- E69R Multifunction Lamp Assembly - Front Fascia Right terminal 1
- If 10 Ω or greater
1. Ignition OFF.
2. Test for less than 2 Ω in the ground circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, repair the open/high resistance in the ground connection.
- Go to next step: If less than 10 Ω
Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
- E13LA Headlamp Assembly - Left terminal 6
- E13RA Headlamp Assembly - Right terminal 6
- E69L Multifunction Lamp Assembly - Front Fascia Left terminal 4
- E69R Multifunction Lamp Assembly - Front Fascia Right terminal 4
Verify the test lamp turns ON and OFF when commanding the appropriate Dedicated Daytime Running Lamp ON and OFF with a scan tool.
- If the test lamp is always OFF
1. Ignition OFF, disconnect the appropriate harness connector listed below at the K9 Body Control Module.
  - X4 - left daytime running lamp
  - X4 - right daytime running lamp (without AVF)
  - X5 - right daytime running lamp
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 appropriate harness connector listed below at the K9 Body Control Module, ignition ON.
  - X4 - left daytime running lamp
  - X4 - right daytime running lamp (without AVF)
  - X5 - right daytime running lamp
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 park/daytime running lamp.