Was the Headlight System Check performed?

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Got to Step 2

Refer to Headlight System Check

1. Turn the ignition switch to the OFF position.
2. Ensure that the ambient light sensor does not have any obstruction.
3. Connect a scan tool.
4. Turn the ignition switch to the ON position. Do not turn the engine ON.
5. Using the scan tool, inspect for any DTCs in the body control module (BCM).

Does the scan tool show any DTCs?

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Refer to Diagnostic System Check - Body Control System

Go to Step 3

Using the scan tool, read the headlamp power relay feedback status in the body control module.

Does the scan tool show the status of ON?

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Go to Step 5

Go tyo Step 4

1. Move the headlamp switch to the OFF/AUTO position.
2. Turn the ignition switch to the OFF position.
3. Disconnect the body control module (BCM).
4. Move the headlamp switch to the ON position.
5. Using the J 35616 , connect a test lamp from terminal A11 of connector C2 at the BCM.
6. Does the test lamp light?

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Go to Step 5

Go to Step 6

1. Reconnect the BCM if disconnected in a previous step.
2. Turn the ignition switch to the ON position. Do not turn the engine ON.
3. Using the scan tool, read the ambient light sensor voltage in the the BCM.
4. While monitoring the scan tool, cover the ambient light sensor, then induce a light source to the sensor.

Does the sensor voltage vary within the specified ranges?

0.2-1.3 V (Headlamps on)

Go to Step 7

Refer to Diagnostic System Check - Body Control System

Locate and Repair the open in CKT 352 (WHT) between the underhood fuse block and the BCM.

Is the repair complete?

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Refer to Headlight System Check

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1. Move the headlamp switch to the OFF/AUTO position.
2. Using the scan tool, command the headlamps ON.

Do the headlamps light?

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Refer to Headlight System Check

Go to Step 8

Replace the BCM. Refer to Body Control Module Replacement in body control system.

Is the repair complete?

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Refer to Headlight System Check

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