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.

Was the Interior Lights System Check performed?

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Go to Step 2

Refer to Interior Lamps System Check

Did you perform the Body Control System (BCM) Diagnostic System Check?

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Go to Step 3

Refer to Diagnostic System Check - Body Control System

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

Does the Tech 2 scan tool display that the status of the DRI DOOR SW is high?

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Go to Step 4

Go to Step 5

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

Does the Tech 2 scan tool display that the status of the DOOR JAMB SW is high?

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Go to Step 6

Go to Step 7

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 within the specified range?

∞

Go to Step 8

Go to Step 9

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

Does the Tech 2 scan tool display that the status of the CTSY LAMP SW is high?

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Go to Step 10

Go to Step 11

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, then replace that door lock switch.

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

Is the repair complete?

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Go to Step 19

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Replace the door lock switch.

Has the repair been made?

--

Go to Step 19

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Repair a short to ground in circuit 49.

Has the repair been made?

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Go to Step 19

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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 within the specified range?

∞

Go to Step 12

Go to Step 5

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 within specified range?

Less than 2 V

Go to Step 13

Go to Step 14

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 within the specified range?

∞

Go to Step 15

Go to Step 7

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Has the repair been made?

--

Go to Step 19

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Repair a short to B+ in circuit 1495.

Has the repair been made?

--

Go to Step 19

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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 within the specified range?

Less than 2 V

Go to Step 16

Go to Step 11

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?

--

Go to Step 17

Go to Step 18

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 19

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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 within the specified range?

Less than 2 V

Go to Step 20

Go to Step 21

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

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

Is the resistance within the specified range?

∞

Go to Step 22

Go to Step 23

Repair a short to voltage in circuit 1732.

Has the repair been made?

--

Go to Step 19

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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?

--

Refer to Interior Lamps System Check

Go to Step 24

Repair a short to ground in circuit 157.

Has the repair been made?

--

Go to Step 19

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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.

Has the repair been made?

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Go to Step 19

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