1. Turn the ignition OFF.
2. Connect a scan tool.
3. Turn the ignition to the ON position.
4. Using the scan tool, check 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 2

1. Turn the headlamp switch to the park position.
2. Connect a test lamp from (back probe) terminal B of the headlamp and panel dimmer switch to ground.

Does the test lamp light?

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Go to Step 4

Go to Step 3

Locate and repair the open in CKT 240 (ORN) between the switch and the mid bussed electrical center (MBEC).

Is the repair complete?

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System OK

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Connect a test lamp from (back probe) terminal A of the headlamp and panel dimmer switch to ground.

Does the test lamp light?

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Go to Step 6

Go to Step 5

Replace the headlamp and panel dimmer switch. Refer to Headlamp Switch Replacement .

Is the repair complete?

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System OK

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Connect a test lamp from the INT PRK fuse, located in the left bussed electrical center (LBEC), to ground.

Does the test lamp light?

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Go to Step 7

Go to Step 8

Locate and repair the open in CKT 74 (LT BLU) between the MBEC and the UBEC.

Is the repair complete?

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System OK

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Locate and repair the open in CKT 74 (LT BLU) between the headlamp and the panel dimmer switch and the LBEC.

Is the repair complete?

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System OK

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