DEFINITION: The courtesy lights stay on with all doors closed, IP dimmer switch off, and none of the interior lighting modes activated. However, the inadvertent load (battery rundown) protection turns off the courtesy lights after 10 minutes.

Was the Interior Lights System Check performed?

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Go to Step 2

Go to Interior Lamps System Check

Was the BCM Diagnostic System Check performed?

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Go to Step 3

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

Enter the BCM Input/Output test. Refer to Body Control Module Diagnostic Information in Body Control System.

Does the BCM enter the Input/Output test?

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Go to Step 4

Go to Step 8

Perform the BCM Input/Output test.

Observe the following lamps:

Do these lamps turn OFF when the BCM performs the Input/Output test 1, and turn ON during tests 2 and 3?

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Go to Step 5

Go to Step 9

Does the chime sound when each vehicle door is opened?

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Go to Step 6

Go to Step 10

Is the vehicle equipped with the content theft deterrent (RPO UA6)?

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Go to Step 7

Go to Step 28

1. Insert the key into the driver's door key cylinder lock.
2. Turn the key until it stops as in trying to unlock the door. Listen to the chime.
3. Remove the key from the driver's door key cylinder lock.
4. Insert the key into the passenger's door key cylinder lock.
5. Turn the key until the key stops as in trying to unlock the door. Listen to the chime.
6. Remove the key from the passenger's door key cylinder lock.

Upon turning each door key cylinder with the key, does the chime sound?

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Go to Step 28

Go to Step 14

1. Turn off the IP dimmer switch.
2. Disconnect the BCM connector C2.
3. Using a test light probe between B+ and the BCM harness connector C2 terminal C2.

Does the test light illuminate?

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Go to Step 17

Go to Step 28

1. Disconnect the BCM connector C1.
2. Using a DMM measure the resistance between the BCM harness connector C1 terminal F and ground.

Is the resistance equal to the specified value?

OL (infinite)

Go to Step 28

Go to Step 19

1. Close the driver's door.
2. Disconnect the BCM connector C2.
3. Using a DMM measure the resistance between the BCM harness connector C2 terminal C1 and ground.

Is the resistance equal to the specified value?

OL (infinite)

Go to Step 12

Go to Step 11

1. Leave the DMM connected.
2. Remove the driver's door interior trim panel. Refer to Front Side Door Trim Panel Replacement in Doors.
3. Disconnect the driver's left door lock switch electrical connector.
4. Use the DMM in order to measure the resistance again.

Is the resistance equal to the specified value?

OL (infinite)

Go to Step 21

Go to Step 20

1. Close all the vehicle doors.
2. Disconnect the BCM connector C2.
3. Using a DMM measure the resistance between the BCM harness connector C2 terminal C3 and ground.

Is the resistance equal to the specified value?

OL (infinite)

Go to Step 28

Go to Step 13

1. Leave the DMM connected.
2. Disconnect the right front, left rear, and right rear door lock switches, one at a time, until the DMM reads infinite.

•	If the DMM shows infinite upon disconnecting one of the door lock switches, then replace that door lock switch.

•	If the DMM does not show infinite after all the door lock switches are disconnected, then repair a short to ground in circuit 49.

Is the repair complete?

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Go to Step 27

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1. Disconnect the BCM connector C2.
2. Using a DMM measure the resistance between the BCM harness connector C2 terminal C5 and ground. Refer to

   Cell 131: B/U Lamp, Pwr Dist, I/P IGN Fuses

   
   
   in Doors.

Is the resistance equal to the specified value?

OL (infinite)

Go to Step 18

Go to Step 15

1. Leave the DMM connected.
2. Disconnect the driver's left key cylinder lock switch. Refer to

   Cell 131: B/U Lamp, Pwr Dist, I/P IGN Fuses

   
   
   in Doors.
3. Use the DMM in order to measure the resistance again.

Is the resistance equal to the specified value?

OL (infinite)

Go to Step 22

Go to Step 16

1. Leave the DMM connected.
2. Disconnect the passenger right key cylinder lock switch. Refer to

   Cell 131: B/U Lamp, Pwr Dist, I/P IGN Fuses

   
   
   in Doors.
3. Using the DMM measure the resistance again.

Is the resistance equal to the specified value?

OL (infinite)

Go to Step 24

Go to Step 23

1. Leave the test light connected.
2. Disconnect the headlamp switch electrical connector.

Does the test light illuminate?

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Go to Step 26

Go to Step 25

Use a DMM in order to measure the resistance between the BCM harness connector C1 terminal F and ground.

Is the resistance equal to the specified value?

OL (infinite)

Go to Step 29

Go to Step 19

Repair the short to ground in circuit 690. Tip: In order to help isolate the short to ground in circuit 690, disconnect C390 first. If the short still is present, then disconnect C200.

Is the repair complete?

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Go to Step 27

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Repair the short to ground in circuit 159.

Is the repair complete?

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Go to Step 27

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Replace the door lock switch.

Is the repair complete?

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Go to Step 27

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Replace the left key cylinder lock switch.

Is the repair complete?

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Go to Step 27

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Repair the short to ground in circuit 781.

Is the repair complete?

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Go to Step 27

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Replace the right key cylinder lock switch.

Is the repair complete?

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Go to Step 27

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Replace the headlamp switch.

Is the repair complete?

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Go to Step 27

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Repair the short to ground in circuit 156.

Is the repair complete?

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Go to Step 27

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1. Turn the ignition switch to the OFF position.
2. Reinstall the connectors and components that were removed.
3. Turn the ignition switch to the RUN position for 6 seconds.
4. Turn the ignition switch to the OFF position.
5. Remove the MALL PGM fuse.
6. Turn the ignition switch to the ACC position. (The BCM sounds the chime a number of times equivalent to the BCM type installed on the vehicle.)
7. Within one second, turn the ignition switch from the ACC position, to the OFF position, then back to the ACC position. (The BCM sounds any DTCs stored.)

Are there any BCM DTCs present?

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

Go to Interior Lamps System Check

Is the repair complete?

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Go to Step 27

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1. Reconnect the BCM connector C1.
2. Turn the ignition witch from OFF to RUN, then back to OFF.
3. Turn the IP dimmer switch to the DOME position for 10 minutes.

Did the courtesy lights turn off after 10 minutes, or 3 minutes if the vehicle has less than 15 total accumulated miles?

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Go to Interior Lamps System Check

Go to Step 28