The BCM does not sound the headlamps on reminder during the following instances:

1

Did you perform the Audible Warning System Check?

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Go to Step 2

Go to Audible Warnings System Check

Have you performed the BCM diagnostic system check?

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Go to Step 3

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

1. Turn the IP dimmer switch OFF.
2. Turn the ignition switch to RUN.
3. Lower the driver's window in order to prevent lockout.
4. Close the vehicle doors.
5. While observing the courtesy lights, open and then close the driver's door.

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

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Go to Step 4

Go to Step 8

1. Turn the IP dimmer switch OFF.
2. Close all vehicle doors.
3. Turn the ignition switch from RUN to LOCK.
4. While observing the courtesy lights, remove the key from the ignition key cylinder.

Did the courtesy lights turn on when the key was removed from the ignition key cylinder?

Go to Step 5

Go to Step 9

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 and back to OFF.

Does the Tech 2 scan tool indicate park lamp off input active with the headlamp switch off?

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Go to Step 10

Go to Step 6

1. Turn the ignition switch to LOCK.
2. Disconnect the BCM connector C1.
3. Turn the headlamp switch to HEAD.
4. Use a DMM in order to measure the voltage between the BCM connector C1 terminal C2 and ground.

Is the voltage less than the specified value?

2 V

Go to Step 10

Go to Step 7

1. Leave the DMM connected from the previous step.
2. Disconnect the headlamp switch electrical connector.
3. Measure the voltage again.

Is the voltage less than the specified value?

2 V

Go to Step 11

Go to Step 12

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 in Lighting Systems for further diagnosis and repair of the interior lights door lock ajar input.

Is the action complete?

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Go to Step 13

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

Is the action complete?

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Go to Step 13

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1. Replace the BCM. Refer to Body Control Module Replacement in Body Control System.
2. 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 13

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Replace the headlamp switch assembly. Refer to Headlamp Switch Replacement in Lighting Systems.

Is the repair complete?

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Go to Step 13

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Repair the short to B+ in circuit 1872.

Is the repair complete?

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Go to Step 13

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1. Turn the ignition switch to LOCK.
2. Reinstall the connectors and the components that were removed.
3. Test for BCM current DTCs. Refer to Diagnostic Trouble Code (DTC) Displaying and Diagnostic System Check - Body Control System in Body Control System.

Is the action complete?

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Go to Audible Warnings System Check

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