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. Enter the Body Control Module (MALL) Diagnostic Mode.

1.1. | Press and hold the power door unlock switch.

1.2. | Cycle the headlamps 6 times.

1.3. | Release the power door unlock switch.

2. The MALL module may sound a few chimes (history codes) upon entering the Diagnostic Mode. Refer to Body Control Module Diagnostic Information in Body Control Systems for a list of these codes.
3. (Without Keyless Entry) Pull the LH front door handle and then release the LH front door handle.
4. (With Keyless Entry) Unlock the vehicle with the keyless entry transmitter.

Does the MALL module sound one chime for each action listed above?

--

Go to Step 13

Go to Step 3

3 | Is the vehicle equipped with keyless entry? | -- | Go to Step 4 | Go to Step 6
4 | Disconnect the remote function actuator (RFA) module connector. Do all of the courtesy lamps turn off? | -- | Go to Step 5 | Go to Step 6
5 | Replace the RFA module. Refer to Remote Control Door Lock Receiver Replacement in Keyless Entry. Is the RFA module replacement complete? | -- | Go to Interior Lamps System Check | --
6 | Disconnect the LH front door handle switch connector. Do all of the courtesy lamps turn off? | -- | Go to Step 7 | Go to Step 8
7 | Replace the LH front door handle switch. Is the LH front door handle switch replacement complete? | -- | Go to Interior Lamps System Check | --
8 | Disconnect the RH front door handle switch connector. Do all of the courtesy lamps turn off? | -- | Go to Step 9 | Go to Step 10
9 | Replace the RH front door handle switch. Is the RH front door handle switch replacement 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. Was a short to ground found? | -- | Go to Step 11 | Go to Step 12
11 | Repair the short to ground in CKT 394 (LT GRN/BLK). Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Interior Lamps System Check | --
12 | Replace the remote function actuator (RFA) module. Refer to Remote Control Door Lock Receiver Replacement in Keyless Entry. Is the RFA module replacement complete? | -- | Go to Interior Lamps System Check | --
13 |

1. Pull the LH front door handle.
2. Open the LH front door.
3. Close the LH front door.
4. Release the LH front door handle.

Does the MALL module sound one chime for each action listed above?

--

Go to Step 14

Go to Step 21

14 |

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

Does the MALL module sound one chime for each action listed above?

--

Go to Step 15

Go to Step 25

15 |

1. Turn the interior lamp switch to the ON position.
2. Turn the interior lamp switch to the OFF position.

Does the MALL module sound one chime for each action listed above?

--

Go to Step 16

Go to Step 33

16 | Inspect CKT 156 (WHT) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems. Was a short to ground found? | -- | Go to Step 19 | Go to Step 17
17 | Inspect CKT 1732 (ORN) for a short to voltage. Refer to Testing for Continuity in Wiring Systems. Was a short to voltage found? | -- | Go to Step 20 | Go to Step 18
18 | Replace the MALL. Refer to Body Control Module Replacement in Body Control System. Is the MALL Module replacement complete? | -- | Go to Interior Lamps System Check | --
19 | Repair the short to ground in CKT 156 (WHT). Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Interior Lamps System Check | --
20 | Repair the short to voltage in CKT 1732 (ORN). Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Interior Lamps System Check | --
21 | Disconnect the LH front door lock actuator C1 connector. Do all of the courtesy lamps turn off? | -- | Go to Step 22 | Go to Step 23
22 | Replace the LH front door lock actuator. Is the actuator replacement complete? | -- | Go to Interior Lamps System Check | --
23 | Inspect CKT 126 (TAN) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems. Was a short to ground found? | -- | Go to Step 24 | Go to Step 18
24 | Repair the short to ground in CKT 126 (TAN). Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Interior Lamps System Check | --
25 | Disconnect the RH front door lock actuator C1 connector. Do all of the courtesy lamps turn off? | -- | Go to Step 26 | Go to Step 27
26 | Replace the RH front door lock actuator. Is the actuator replacement complete? | -- | Go to Interior Lamps System Check | --
27 | Disconnect the LH rear door lock actuator C1 connector. Do all of the courtesy lamps turn off? | -- | Go to Step 28 | Go to Step 29
28 | Replace the LH rear door lock actuator. Is the actuator replacement complete? | -- | Go to Interior Lamps System Check | --
29 | Disconnect the RH rear door lock actuator C1 connector. Do all of the courtesy lamps turn off? | -- | Go to Step 30 | Go to Step 31
30 | Replace the RH rear door lock actuator. Is the actuator replacement complete? | -- | Go to Interior Lamps System Check | --
31 | Inspect CKT 49 (DK BLU) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems. Was a short to ground found? | -- | Go to Step 32 | Go to Step 18
32 | Repair the short to ground in CKT 49 (DK BLU). Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Interior Lamps System Check | --
33 | Disconnect the headlamp switch connector (Oldsmobile and Pontiac) or the lamp dimmer switch (Buick). Do all of the courtesy lamps turn off? | -- | Go to Step 34 | Go to Step 35
34 | Replace the headlamp switch (Oldsmobile and Pontiac) or the lamp dimmer switch (Buick). Refer to one of the following procedures in Instrument Panel, Gauges and Console:

• | Instrument Cluster Trim Panel Replacement

• | Instrument Cluster Trim Panel Replacement

• | Instrument Cluster Trim Panel Replacement

Is the switch replacement complete?

--

Go to Interior Lamps System Check

--

35 | Inspect CKT 1393 (DK BLU) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems. Was a short to ground found? | -- | Go to Step 36 | Go to Step 18
36 | Repair the short to ground in CKT 1393 (DK BLU). Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Interior Lamps System Check | --