GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 LeSabre 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Courtesy Lamps Always On

Step

Action

Value(s)

Yes

No

1

Was the entire Interior Lights System Check performed?

--

Go to Step 2

Go to Interior Lamps System Check

2
  1. Enter the Body Control Module (MALL) Diagnostic Mode.
    2. 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 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 Systems.

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 C1.

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 C1.

Is the actuator replacement complete?

--

Go to Interior Lamps System Check

--

27

Disconnect the RH front 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 C1.

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 C1 connector.

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 Headlamp Switch Replacement in Lighting or Instrument Panel Multifunction Switch Assembly Replacement in Instrument Panel, Gauges and Console.

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

--