Important: The courtesy lights do not turn ON when a passenger door is open. The courtesy light turn ON when the IP dimmer switch is in the DOME switch.

Did you perform the Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Turn the ignition switch to the LOCK position.
2. Connect the scan tool to the data link connector (DLC).
3. Turn the ignition switch to the RUN position.
4. Use the scan tool in order to monitor the status of the DRIVER DOOR SWITCH.
5. While observing the scan tool, open then close the driver's door.

Does the scan tool display that the status of the DRI DOOR SW is low when the driver's door is open?

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Go to Step 3

Go to Step 4

1. Ensure that all of the vehicle doors are closed.
2. While observing the scan tool, open then close each vehicle door, one door at a time.

Does the scan tool display that the status of the DOOR JAMB SWITCH is low when each vehicle door is open?

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Go to Step 5

Go to Step 6

1. Leave the driver's door open.
2. Use a DMM in order to probe and measure the resistance between the following components:

•	The body control module (BCM) connector C1 terminal D16

•

Ground

Is the resistance less than the specified value?

2 ohms

Go to Step 8

Go to Step 9

1. Disconnect the scan tool from the DLC.
2. Ensure that all of the vehicle doors are closed.
3. Turn the ignition switch to the RUN position.
4. While observing the courtesy lights, open then close each vehicle door, one door at a time.

Do courtesy lights turn ON when each vehicle door is open?

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Go to Step 7

Go to Step 8

1. Open an inoperative door. If none of the doors turns ON the courtesy lights, leave the driver's door open.
2. Use a DMM in order to backprobe and measure the resistance between the following components:

•	The body control module (BCM) connector C1 terminal C16

•

Ground

Is the resistance less than the specified value?

2 ohms

Go to Step 8

Go to Step 10

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

Is the repair complete?

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Go to Step 17

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1. Inspect the BCM connector for a poor terminal contact. Perform repairs as necessary.
2. If the BCM connector is OK, replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Is the repair complete?

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Go to Step 17

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1. Disconnect the driver's door lock switch electrical connector C1.
2. Use a test light in order to connect the following components:

•

B+

•	The door lock switch harness connector C1 terminal D

Does the test light illuminate?

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Go to Step 11

Go to Step 12

1. Disconnect the inoperative door lock switch electrical connector C1.
2. Use a test light in order to connect between B+ and the following components:

•	Left front or left rear door lock switch harness connector C1 terminal D

•	Right front or right rear door lock switch harness connector C1 terminal A

Does the test light illuminate?

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Go to Step 13

Go to Step 12

1. Disconnect the BCM connector C1.
2. Use a DMM in order to measure the resistance between the following components:

•	The BCM harness connector C1 terminal D16

•	The driver's door lock switch harness connector C1 terminal C

Is the resistance less than the specified value?

2 ohms

Go to Step 14

Go to Step 15

Repair a poor connection or an open in circuit 750.

Is the repair complete?

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Go to Step 17

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1. Disconnect the BCM connector C1.
2. Use a DMM in order to measure the resistance between the BCM harness connector C1 terminal C16 and the following components:

•	Left front or left rear door lock switch harness connector C1 terminal B

•	Right front or right rear door lock switch harness connector C1 terminal C

Is the resistance less than the specified value?

2 ohms

Go to Step 14

Go to Step 16

Replace the inoperative door lock switch assembly.

Is the repair complete?

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Go to Step 17

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Repair a poor connection or an open in circuit 49.

Is the repair complete?

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Go to Step 17

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Repair a poor connection or an open in circuit 727.

Is the repair complete?

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Go to Step 17

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1. Turn the ignition switch to the LOCK position.
2. Reconnect the connectors and reinstall the components that were removed.

Is the repair complete?

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Go to Diagnostic System Check - Lighting Systems

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