Did you perform the Interior Lamps System Check?

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Go to Step 2

Go to Interior Lamps System Check

1. Turn the ignition switch to RUN.
2. Enter the body control module (MALL) diagnostic mode by performing the following steps:

2.1.	Press and hold the power unlock switch.

2.2.	Cycle the headlamps 6 times.

2.3.	Release the power unlock switch.

3. The MALL module may sound a few tones upon entering the diagnostic mode. The tones are the history codes stored in the MALL module. Refer to Body Control Module Diagnostic Information in Body Control System.
4. Use the keyless entry transmitter in order to unlock the car.

Does the MALL module sound 2 tones when the car is unlocked using the keyless entry transmitter?

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Go to Step 3

Go to Step 8

Turn the interior lamp switch on.

Does the MALL module sound 1 tone when the interior lamp switch is activated?

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Go to Step 4

Go to Step 11

1. Turn the interior lamp switch off.
2. Open the left front door.
3. Close the left front door.

Does the MALL module sound 1 tone when the left front door is opened and 1 tone when the left front door is closed?

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Go to Step 5

Go to Step 14

1. Open the right front door.
2. Close the right front door.

Does the MALL module sound 1 tone when the right front door is opened and 1 tone when the right front door is closed?

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Go to Step 6

Go to Step 17

1. Open the left rear door.
2. Close the left rear door.

Does the MALL module sound 1 tone when the left rear door is opened and 1 tone when the left rear door is closed?

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Go to Step 7

Go to Step 20

Test CKT 156 (WHT) for a short to ground between S356 and the MALL module. Refer to Testing for Short to Ground in Wiring Systems.

Is CKT 156 OK?

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Go to Step 27

Go to Step 26

Disconnect the remote function actuator (RFA) module connector.

Do all of the courtesy lamps turn off?

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Go to Step 9

Go to Step 10

Replace the RFA module. Refer to Remote Control Door Lock Receiver Replacement in Keyless Entry.

Is the repair complete?

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Go to Interior Lamps System Check

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Test CKT 394 (LT GRN/BLK) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems.

Is CKT 394 OK?

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Go to Step 25

Go to Step 26

Disconnect the interior lamp switch connector.

Do all of the courtesy lamps turn off?

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Go to Step 12

Go to Step 13

Replace the interior lamp switch. Refer to Instrument Cluster Trim Panel Replacement in Instrument Panel, Gauges and Console.

Is the repair complete?

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Go to Interior Lamps System Check

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Test CKT 1393 (DK BLU) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems.

Is CKT 1393 OK?

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Go to Step 25

Go to Step 26

Disconnect the left front door jamb switch.

Do all of the courtesy lamps turn off?

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Go to Step 15

Go to Step 16

Replace the left front door jamb switch. Refer to Door Lock Actuator Replacement in Doors.

Is the repair complete?

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Go to Interior Lamps System Check

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Test CKT 155 (BLK) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems.

Is CKT 155 OK?

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Go to Step 25

Go to Step 26

Disconnect the right front door jamb switch.

Do all of the courtesy lamps turn off?

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Go to Step 18

Go to Step 19

Replace the right front door jamb switch. Refer to Door Lock Actuator Replacement in Doors.

Is the repair complete?

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Go to Interior Lamps System Check

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Test CKT 49 (DK BLU) (Oldsmobile) or CKT 528 (YEL) (Buick) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems.

Is CKT 49 (Oldsmobile) or CKT 528 (Buick) OK?

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Go to Step 25

Go to Step 26

Disconnect the left rear door jamb switch.

Do all of the courtesy lamps turn off?

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Go to Step 24

Go to Step 21

Disconnect the right rear door jamb switch.

Do all of the courtesy lamps turn off?

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Go to Step 22

Go to Step 23

Replace the right rear door jamb switch. Refer to Rear Side Door Lock Actuator Replacement in Doors.

Is the repair compete?

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Go to Interior Lamps System Check

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Test CKT 49 (DK BLU) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems.

Is CKT 49 OK?

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Go to Step 25

Go to Step 26

Replace the left rear door jamb switch. Refer to Rear Side Door Lock Actuator Replacement in Doors.

Is the repair complete?

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Go to Interior Lamps System Check

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

Is the repair complete?

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Go to Interior Lamps System Check

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Repair the suspect wiring. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Interior Lamps System Check

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Test CKT 1732 (ORN) for a short to battery voltage between S336 and the MALL module. Refer to Testing for Continuity in Wiring Systems.

Is CKT 1732 OK?

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Go to Step 25

Go to Step 26