Important: The courtesy lights stay ON with all doors closed, the IP dimmer switch OFF, and none of the interior lighting modes activated. However, the inadvertent load (battery rundown) protection should turn OFF the courtesy lights after 20 minutes.

Did you perform the Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Ensure that the IP dimmer switch is OFF.
2. Close all of the vehicle doors.
3. Turn the ignition switch to the LOCK position.
4. Connect the scan tool to the data link connector (DLC).
5. Turn the ignition switch to the RUN position.
6. Use the scan tool in order to monitor the status of the DRI DOOR SW.

Does the scan tool display that the status of the DRI DOOR SW is high?

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Go to Step 3

Go to Step 4

1. Ensure that all of the vehicle doors remain closed.
2. Use the scan tool in order to monitor the status of the DOOR JAMB SW.

Does the scan tool display that the status of the DOOR JAMB SW is high?

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Go to Step 5

Go to Step 6

1. Disconnect the left front door lock switch electrical connector.
2. Disconnect the BCM connector C1.
3. Ensure that the drivers door remains completely closed when performing the following step.
4. Use a DMM in order to measure the resistance between the following components:

•	The BCM harness connector C1 terminal D16

•

Ground

Is the resistance equal to the specified value?

∞

Go to Step 7

Go to Step 8

1. Ensure that all of the vehicle doors remain closed.
2. Use the scan tool in order to monitor the status of the CTSY LAMP SW.

Does the scan tool display that the status of the CTSY LAMP SW is high?

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Go to Step 9

Go to Step 10

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

•	The BCM harness connector C1 terminal C16

•

Ground

4. Disconnect the following door lock switches one at a time, until the DMM reads infinite resistance:

•	The left front

•	The right front

•	The left rear

•	The right rear

•	If the DMM show infinite when disconnecting one of the door lock switches, replace that door lock switch.

•	If the DMM does not show infinite after all door lock switches are disconnected, repair a short to ground in circuit 727.

Is the repair complete?

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Go to Step 18

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Replace the door lock switch.

Is the repair complete?

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Go to Step 18

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Repair a short to ground in circuit 49.

Is the repair complete?

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Go to Step 18

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1. Turn the ignition switch to the LOCK position.
2. Disconnect the BCM connector C1.
3. Ensure that the driver's door remains completely closed when performing the following step.
4. Use a DMM in order to measure the resistance between the following components:

•	The BCM harness connector C1 terminal D16

•

Ground

Is the resistance equal to the specified value?

∞

Go to Step 11

Go to Step 4

1. Disconnect the headlamp switch electrical connector.
2. Use a DMM in order to measure the voltage between the following components:

•	The BCM harness connector C2 terminal D15

•

Ground

Is the voltage less than specified value?

2 V

Go to Step 12

Go to Step 13

1. Ensure that all the vehicle doors remain closed when performing the following step.
2. Use a DMM in order to measure the resistance between the following components:

•	The BCM harness connector C1 terminal C16

•

Ground

Is the resistance equal to the specified value?

∞

Go to Step 14

Go to Step 6

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Is the repair complete?

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Go to Step 18

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Repair a short to B+ in circuit 1495.

Is the repair complete?

--

Go to Step 18

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1. Ensure that the IP dimmer switch is turned OFF when performing the following step.
2. Use a DMM in order to measure the voltage between the following components:

•	The BCM harness connector C1 terminal D15

•

Ground

Is the voltage less than the specified value?

2 V

Go to Step 15

Go to Step 10

1. Reconnect the BCM connectors C1 and C3.
2. Turn the ignition switch to the RUN position.
3. Ensure that the IP dimmer switch is OFF.
4. Close all of the vehicle doors.
5. Observe the courtesy lights.

Are the courtesy lights OFF?

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Go to Step 16

Go to Step 17

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 18

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1. Disconnect the body control module (BCM) connectors C2 and C3.
2. Use a DMM in order to measure the voltage between the following components:

•	The BCM harness connector C3 terminal F

•

Ground

Is the voltage less than the specified value?

2 V

Go to Step 19

Go to Step 20

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

Have all the repairs been made?

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Go to Diagnostic System Check - Lighting Systems

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Use a DMM in order to measure the resistance between the following components:

Is the resistance equal to the specified value?

∞

Go to Step 21

Go to Step 22

Repair a short to voltage in circuit 1732.

Is the repair complete?

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Go to Step 18

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1. Reconnect the BCM connector C1.
2. Turn the ignition switch from LOCK to RUN, then back to LOCK.
3. Turn the IP dimmer switch to the DOME position for 20 minutes.

Did the courtesy lights turn OFF after 20 minutes, or 3 minutes if the vehicle has less than 15 total accumulated miles?

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Go to Diagnostic System Check - Lighting Systems

Go to Step 23

Repair a short to ground in circuit 157.

Is the repair complete?

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Go to Step 18

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

Is the repair complete?

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Go to Step 18

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