Lighting System - Repair Instructions Buick LaCrosse II

Brake Pedal Position Sensor Calibration

Note. Brake system does not use a brake switch, stoplight switch or brakelight switch. System uses a Brake Pedal Position Sensor to control these functions.

Calibration Criteria

Note. Do not apply the brake pedal during the brake pedal position sensor calibration procedure. Any movement of the brake pedal during this procedure will cause the calibration procedure to fail. If this occurs, the brake pedal position sensor calibration must be repeated.

Brake pedal position sensor calibration must be performed after the brake pedal position sensor or body control module (BCM) have been serviced. The calibration procedure will set the brake pedal position sensor home value. This value is used by the BCM to determine the action of the driver applying the brake system and to provide this information to the vehicle subsystems via serial data.

Calibration Procedure

1. Apply the parking brake.
2. Place the transmission in the PARK position.
3. Install a scan tool.
4. Clear all BCM DTCs before proceeding.
5. Navigate to the Module Diagnosis menu.
6. Select BCM menu item.
7. Select Configuration/Reset Functions menu item.
8. Select the Brake Pedal Position Sensor Learn procedure and follow the directions displayed on the screen.
9. Perform the Engine Control Module (ECM) brake pedal position sensor calibration. Refer to «Brake Pedal Position Sensor Learn»(/buick/lacrosse/ii-2009-2013/remont/automatic-trans/#automatic-transmission-6t70-diagnostic-information-and-procedures__brake-pedal-position-sensor-learn) .

Brake Pedal Position Sensor Replacement

Note. Brake system does not use a brake switch, stoplight switch or brakelight switch. System uses a Brake Pedal Position Sensor to control these functions.

Scheme 1

Brake Pedal Position Sensor Replacement

Scheme 2

Headlamp Switch Replacement

Scheme 3

Dome and Reading Lamp Replacement - Front

Scheme 4

Dome and Reading Lamp Replacement - Rear

Scheme 5

Front Floor Console Cup Holder Illumination Lamp Replacement

Scheme 6

Front Floor Console Compartment Lamp Replacement

Scheme 7

Front Floor Console Armrest Compartment Lamp Replacement

Removal Procedure

1. Remove the front side door trim panel. Refer to «Front Side Door Trim Panel Replacement»(/buick/lacrosse/ii-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
2. From the back side of the trim panel, unsnap to release the lamp harness (1) from the door trim by pulling the wire leads using a flat-bladed tool.
3. Cut the existing lamp harness wires (1) approximately 89 mm (3.5 in) from the connector end.

Installation Procedure

1. Install the new inside handle illumination lamp (1). At the middle of the harness, cut the wires to remove the connector end. On the other end, remove the lamp from the housing. Discard the connector end and housing.
2. For instructions on splicing the new lamp harness, refer to «Wiring Repairs»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs) .

1. Remove the rear side door trim panel. Refer to «Rear Side Door Trim Panel Replacement»(/buick/lacrosse/ii-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
2. From the back side of the trim panel, unsnap to release the lamp harness (1) from the door trim by pulling the wire leads using a flat-bladed tool.
3. Cut the existing lamp harness wires (1) approximately 89 mm (3.5 in) from the connector end.

1. Install the new inside handle illumination lamp (1). At the middle of the harness, cut the wires to remove the connector end. On the other end, remove the lamp from the housing. Discard the connector end and housing.
2. For instructions on splicing the new lamp harness, refer to «Wiring Repairs»(/buick/lacrosse/ii-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs) .

Scheme 8

Front Side Door Warning Lamp Replacement

Scheme 9

Rear Side Door Warning Lamp Replacement

Scheme 10

Instrument Panel Compartment Lamp Replacement

Scheme 11

Sunshade Illuminated Mirror Lamp Bulb Replacement

Scheme 12

Dome Lamp Bulb Replacement

Scheme 13

Headlamp Replacement

Scheme 14

Headlamp Ballast Replacement (TT2)

Scheme 15

Headlamp Bulb Replacement (TT2)

Scheme 16

Headlamp Bulb Replacement (TT4 Low Beam)

Scheme 17

Headlamp Bulb Replacement (TT4 High Beam)

Aiming Headlamps (Visual Aim)

Note. Some state and local laws specify requirements for headlamp aim. All of these laws must be complied with when performing any headlamp aiming operations.

Headlamp aim should be checked

1. When a new headlamp capsule is installed.
2. If service or repairs to the front end area have (or may have) disturbed the headlamps or their mounting.
3. Suspension components have been replaced or repaired.

1. The area will consist of a level surface large enough to allow for a vehicle and an additional 7.62 m (25 ft) measured from face of lamps to the front of the aiming screen.
2. The screen will be 1.52 m (5 ft) high x 3.66 m (12 ft) wide with a matte white surface well shaded from extraneous light, and properly adjusted to the floor on which the vehicle stands. Provisions may be made for moving the screen so it can be aligned parallel with the vehicle.
3. The screen shall be provided with a fixed vertical centerline, 2 laterally adjustable vertical tapes, and 1 vertically adjustable horizontal tape.
4. If a regular commercial aiming screen is not available, the screen may consist of a vertical wall having a clear uninterrupted area approximately 1.83 m (6 ft) high and 3.66 m (12 ft) wide. The surface should be finished with a washable non-gloss white paint.
5. After the aiming screen has been set up in its permanent location, it is necessary to paint a reference line on the floor directly under the lens of the lamps to indicate the proper location of the headlamps when they are being aimed: Distance between headlamps (1) Center line of screen (2) Adjustable vertical pointer (3) Adjustable horizontal tape (4) Diagram of light screen (5) Vertical center line ahead of right headlamp pointer position (6) 7.62 m (25 ft) (7) Car centerline axis (8)

Prior to aiming the headlamps, the following steps must be taken

1. Remove any snow, ice or mud from the vehicle.
2. The vehicle must have a full tank of gas.
3. Stop all other work on the vehicle.
4. If any service has been performed on the vehicle, make sure that all of the components are back in their original place.
5. The vehicle must be on a level surface.
6. The vehicle left tires must be aligned with the reference line extending from the screen with the headlamps aligned with the vertical reference line (2).
7. Do not load any cargo in the vehicle.
8. The vehicle must contain 1 person or 72.56 kg (160 lb) on the driver's seat.
9. Inflate the tires to the proper pressure.
10. Simulate the vehicle loads if the intended use of the vehicle is for hauling heavy loads or towing a trailer.
11. Rock the vehicle in order to stabilize the suspension.
12. Turn ON the headlamps to low beam and observe the left and the top edges of the high intensity zone on the screen. The edges of the high intensity zone should fall within the specifications.

Headlamp Aiming Procedure

1. Open the hood.
2. Measure from the floor to the center of the headlamp bulb, some headlamps have an aim dot marked on the headlamp lens.
3. At the screen, measure from the floor and place the horizontal tape at the measured distance.
4. Measure from the reference line on the floor to the left headlamp bulb centerline.
5. At the screen, measure from the reference line and place the vertical tape at the measured distance.
6. Measure from the reference line on the floor to the right headlamp bulb centerline.
7. At the screen, measure from the reference line and place the vertical tape at the measured distance.
8. Turn on the low beam headlamps and block the light from projecting onto the screen from the passenger side headlamp.
9. Adjust the vertical aim of the headlamps to the specifications required by the state and the local authorities, or as shown in step number 8.
10. Rotate the headlamp adjuster to change the vertical aim of the headlamp.
11. Repeat the aiming procedure for the passenger side headlamp while blocking the light from projecting onto the screen from the driver side headlamp.
12. Close the hood.

Scheme 18

Headlamp Control Module Replacement

Scheme 19

Front Fog Lamp Replacement

Scheme 20

Front Fog Lamp Bulb Replacement

Adjustment Procedure

Proper road illumination and safety require the fog lamps to be aimed. The front fog lamp aim should be checked when a new front fog lamp assembly is installed, or if any service repairs have been performed to the vehicle which disturb the front fog lamp mounting or the vehicle ride height.

There are no horizontal adjustments for aiming the front fog lamp assemblies on this vehicle.

1. To ensure accurate vertical front fog lamp aiming, first perform the following steps to prepare the vehicle. Make sure that all the components are in place on the vehicle, the tires are properly inflated, and there is not any mud or snow clinging to the vehicle. Stop all other operations of work on the vehicle. Make sure the fuel level is 1/2 full or more. Jounce the vehicle to settle the suspension. Place the vehicle on a level surface 7.6 m (25 ft) from the target screen. Measure the distance from the floor to the center of the fog lamp (5). Using this measurement, mark the horizontal centerline of the fog lamp (1) on the target screen directly in front of the vehicle. Start the vehicle in order to level the electronic suspension. Turn off the vehicle.
2. Turn the front fog lamps ON.
3. Turn the adjusting screw located on the exterior lower outer grille assembly, top side of the fog lamp projector and adjust the fog lamp projector aim beam.
4. Adjust the fog lamp up or down until the top edge of the high intensity zone on the screen is 102 mm (4 in) below the horizontal centerline.
5. Turn OFF the front fog lamps.

Scheme 21

Daytime Running Lamp Bulb Replacement (TT2)

Scheme 22

Front Turn Signal Lamp Bulb Replacement (TT4)

Scheme 23

High Mount Stop Lamp Replacement

Scheme 24

Cargo Center Courtesy Lamp Bulb Replacement

Scheme 25

Backup Lamp Bulb Replacement

Scheme 26

Rear License Plate Lamp Replacement

Scheme 27

Tail Lamp Replacement

Scheme 28

Rear Turn Signal Lamp Bulb Replacement

See also:
• Brake Pedal Position Sensor Learn
• Instrument Panel Insulator Panel Replacement - Left Side
• Front Side Door Trim Panel Replacement
• Wiring Repairs
• Front Bumper Fascia Replacement
• Fastener Caution
• Halogen Bulb Warning
• Front Compartment Sight Shields Replacement
• Instrument Panel Wiring Harness Junction Block Replacement
• Control Module References
• Front Wheelhouse Front Liner Replacement
• Radiator Lower Outer Grille Replacement
• Brake Pedal Position Sensor Calibration
• Headlamp Aiming