Did you perform the DRL System Check?

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Go to Step 2

Go to Daytime Running Lights (DRL) 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 start the engine.
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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Go to Diagnostic System Check - Body Control System in Body Control System

Go to Step 3

Move the headlamp switch to the ON position.

Do the headlamps illuminate?

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Go to Step 4

Go to Headlamps Inoperative - Low Beams

Using the scan tool, read the Head Lamp Relay Feedback status in the Body Control Module.

Does the scan tool show the status of ON?

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Go to Step 6

Go to Step 5

1. Move the headlamp switch to the 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 illuminate?

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Go to Step 6

Go to Step 7

1. Reconnect the BCM if disconnected in a previous step.
2. Turn the ignition switch to the ON position. Do not start the engine.
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?

4.7-2.2 V (DRL on)

0.2-1.3 V (Headlamps on)

Go to Step 8

Go to Diagnostic System Check - Body Control System in Body Controls

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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Go to Daytime Running Lights (DRL) System Check

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

Do the headlamps illuminate?

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Go to Daytime Running Lights (DRL) System Check

Go to Step 9

Replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Is the repair complete?

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Go to Daytime Running Lights (DRL) System Check

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