For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the entire Interior Lights System Check? | -- | Go to Step 2 | Go to Interior Lamps System Check
2 |

1. Set the ignition switch to the RUN position.
2. Enter the body control module (MALL) diagnostic mode.

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 chimes upon entering the diagnostic mode. The chimes 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 chimes when the car is unlocked using the keyless entry transmitter?

--

Go to Step 3

Go to Step 8

3 | Turn the interior lamp switch to the ON position. Does the MALL module sound one chime when the interior lamp switch is activated? | -- | Go to Step 4 | Go to Step 11
4 |

1. Turn the interior lamp switch to the OFF position.
2. Open the left front door.
3. Close the left front door.

Does the MALL module sound one chime when the left front door is opened, and one chime when the left front door is close?

--

Go to Step 5

Go to Step 14

5 |

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

Does the MALL module sound one chime when the right front door is opened, and one chime when the right front door is closed?

--

Go to Step 6

Go to Step 17

6 |

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

Does the MALL module sound one chime when the left rear door is opened, and one chime when the left rear door is closed?

--

Go to Step 7

Go to Step 20

7 | Inspect 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? | -- | Go to Step 27 | Go to Step 26
8 | Disconnect the remote function actuator (RFA) module connector. Do all of the courtesy lamps turn off? | -- | Go to Step 9 | Go to Step 10
9 | Replace the RFA module. Refer to Remote Control Door Lock Receiver Replacement in Keyless Entry. Is the repair complete? | -- | Go to Interior Lamps System Check | --
10 | Inspect CKT 394 (LT GRN/BLK) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems. Is CKT 394 OK? | -- | Go to Step 25 | Go to Step 26
11 | Disconnect the interior lamp switch connector. Do all of the courtesy lamps turn off? | -- | Go to Step 12 | Go to Step 13
12 | Replace the interior lamp switch. Refer to Instrument Cluster Trim Panel Replacement in Instrument Panel, Gauges and Console. Is the repair complete? | -- | Go to Interior Lamps System Check | --
13 | Inspect CKT 1393 (DK BLU) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems. Is CKT 1393 OK? | -- | Go to Step 25 | Go to Step 26
14 | Disconnect the LH front door lock actuator. Do all of the courtesy lamps turn off? | -- | Go to Step 15 | Go to Step 16
15 | Replace the LH front door lock actuator. Refer to Door Lock Actuator Replacement in Doors. Is the repair complete? | -- | Go to Interior Lamps System Check | --
16 | Inspect CKT 155 (BLK) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems. Is CKT 155 OK? | -- | Go to Step 25 | Go to Step 26
17 | Disconnect the RH front door lock actuator. Do all of the courtesy lamps turn off? | -- | Go to Step 18 | Go to Step 19
18 | Replace the RH front door lock actuator. Refer to Door Lock Actuator Replacement in Doors. Is the repair complete? | -- | Go to Interior Lamps System Check | --
19 | Inspect 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? | -- | Go to Step 25 | Go to Step 26
20 | Disconnect the LH rear door lock actuator. Do all of the courtesy lamps turn off? | -- | Go to Step 24 | Go to Step 21
21 | Disconnect the RH rear door lock actuator. Do all of the courtesy lamps turn off? | -- | Go to Step 22 | Go to Step 23
22 | Replace the RH rear door lock actuator. Refer to Rear Side Door Lock Actuator Replacement in Doors. Is the repair compete? | -- | Go to Interior Lamps System Check | --
23 | Inspect CKT 49 (DK BLU) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems. Is CKT 49 OK? | -- | Go to Step 25 | Go to Step 26
24 | Replace the LH rear door lock actuator. Refer to Rear Side Door Lock Actuator Replacement in Doors. Is the repair complete? | -- | Go to Interior Lamps System Check | --
25 | Replace the MALL. Refer to Body Control Module Replacement in Body Control System. Is the repair complete? | -- | Go to Interior Lamps System Check | --
26 | Repair the suspect wiring. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Interior Lamps System Check | --
27 | Inspect CKT 1732 (ORN) for a short to the battery voltage between S336 and the MALL module. Refer to Testing for Continuity in Wiring Systems. Is CKT 1732 OK? | -- | Go to Step 25 | Go to Step 26