DEFINITION: The BCM does not sound the headlamps on reminder when the driver's door is open, the headlamp switch is in either PARK or HEAD position, and the ignition switch is removed.

Was the BCM diagnostic system check performed?

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Go to Step 2

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

1. Make sure the I/P dimmer switch is off.
2. Turn the ignition switch on.
3. Lower the driver's window (to prevent lockout).
4. Close all vehicle doors.
5. While observing the courtesy lamps, open then close the driver's door.

Did the courtesy lamps turn on with the driver's door open?

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Go to Step 3

Go to Step 7

1. Make sure the I/P dimmer switch is off, and all the vehicle doors closed.
2. Turn the ignition switch off.

While observing the courtesy lights, remove the key from the ignition key cylinder.

Did the courtesy lamps turn on when removing the key from the ignition key cylinder?

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Go to Step 4

Go to Step 8

1. Connect a Tech 2 scan tool to the Data Link Connector (DLC).
2. Use the Tech 2 scan tool in order to monitor the park lamp off input.
3. While observing the Tech 2 scan tool, turn the headlamp switch from off to HEAD, back to off.

Does the scan tool display that the park lamp off input remain off in the on position?

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Go to Step 9

Go to Step 5

1. Turn the ignition switch off.
2. Disconnect the BCM connector C1.
3. Turn the headlamp switch to the HEAD position.
4. Using a DMM, measure the voltage between the BCM connector C1 terminal C2 and ground.

Is the voltage within the specified range?

Less than 2V

Go to Step 9

Go to Step 6

1. Leave the DMM connected from the previous step.
2. Disconnect C201.
3. Measure the voltage again.

Is the voltage within the specified range?

Less than 2V

Go to Step 10

Go to Step 11

The headlamp on reminder is inoperative due to a malfunction between the BCM and the driver's door lock ajar switch. Refer to Interior Lamps System Check for diagnosis and repair of the interior lights door lock ajar input.

Is the action complete?

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Go to Step 12

The headlamp on reminder is inoperative due to a malfunction between the BCM and the ignition switch. Refer to Key-in-Ignition Chime Always On for the diagnosis and repair of the ignition key alarm input.

Is the action complete?

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Go to Step 12

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1. Replace the BCM. Refer to Body Control Module Replacement in Body Control System for replacement procedures.
2. After BCM replacement, perform the Setup New BCM procedure. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Is the repair complete?

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Go to Step 12

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Replace the headlamp switch. Refer to Turn Signal and Multifunction Switch Assembly - Disassemble - Off Vehicle in Steering Wheel and Column - Tilt for service procedures.

Is the repair complete?

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Go to Step 12

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Repair short to B+ in circuit 1872.

Is the repair complete?

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Go to Step 12

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1. Turn the ignition switch off.
2. Reinstall the connectors/components removed.
3. Check for BCM current DTCs. Refer to Diagnostic Trouble Code (DTC) Displaying in Body Control System for procedure.

Are there any BCM current DTCs present?

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

System OK