The courtesy lights do not turn on when the IP dimmer switch is in the DOME position. The courtesy lights turn on when any door is open.

Was the Interior Lights System Check performed?

--

Go to Step 2

Refer to Interior Lamps System Check

Was the BCM Diagnostic System Check performed?

--

Go to Step 3

Refer to Diagnostic System Check - Body Control System

1. Turn the ignition switch to the LOCK position.
2. Connect the Tech 2 scan tool to the Data Link Connector (DLC).
3. Turn the ignition switch to the RUN position.
4. Use the Tech 2 scan tool in order to monitor the status of the CTSY LAMP SW.
5. While observing the Tech 2 scan tool, turn the IP dimmer switch from off to DOME, and back to off.

Does the Tech 2 scan tool display that the status of the CTSY LAMP SW is high when the IP dimmer switch is in the DOME position?

--

Go to Step 4

Go to Step 5

1. Turn the ignition switch to the LOCK position.
2. Disconnect the Tech 2 scan tool from the DLC.
3. Turn the ignition switch to the RUN position.
4. Close all the vehicle doors.
5. While observing the courtesy lights, turn the IP dimmer switch to the DOME position.

Do the courtesy lights turn on when the IP dimmer switch is in the DOME position?

--

Go to Step 6

Go to Step 7

1. Turn the IP dimmer switch to the DOME position.
2. Use a test light in order to probe and connect between the following components:

•	The Body Control Module (BCM) connector C1 terminal D15

•

Ground

Does the test light illuminate?

--

Go to Step 4

Go to Step 8

A malfunction is not present at this time. Refer to Interior Lights Circuit Description for more information regarding the operation of the courtesy lights.

Has the repair been made?

--

Go to Step 13

--

1. Inspect the BCM connector C1 terminal D15 for a poor terminal contact. Perform repairs as necessary.
2. If the BCM Connector C1 terminal D15 is OK, then replace the BCM. Refer to Body Control Module Replacement in Body Control System.
3. After BCM replacement, perform the Setup New BCM Procedure. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Has the repair been made?

--

Go to Step 13

--

1. Disconnect the headlamp switch electrical connector.
2. Use a test light in order to connect between the following components:
3. The headlamp switch harness connector terminal N
4. Ground

Does the test light illuminate?

--

Go to Step 9

Go to Step 10

1. Turn the ignition switch to the LOCK position.
2. Disconnect the BCM connector C1.
3. Use a DMM in order to measure the resistance between the following components:

•	The BCM harness connector C1 terminal D15

•	The headlamp switch harness connector terminal M

Is the resistance within the specified range?

Less than 2 ohms

Go to Step 11

Go to Step 12

Repair a poor connection of an open in circuit 1750.

Has the repair been made?

--

Go to Step 13

--

Replace the headlamp switch assembly.

Has the repair been made?

--

Go to Step 13

--

Repair the a poor connection or an open in circuit 1495.

Has the repair been made?

--

Go to Step 13

--

1. Turn the ignition switch to the LOCK position.
2. Reinstall any removed connectors or components.

Have all the repairs been made?

--

Refer to Interior Lamps System Check

--