2010 BUICK LACROSSE headlamp

9-32 Vehicle Care
Base
Up-Level7. Locate the vertical headlamp
aiming screws, which are under
the hood near each headlamp
assembly.
The adjustment screw can be
turned with a E8 Torx
®socket.
8. Turn the vertical aiming screw until the headlamp beam is
aimed to the horizontal tape line.
Turn it clockwise or
counterclockwise to raise or
lower the angle of the beam.
9. Make sure that the light from theheadlamp is positioned at the
bottom edge of the horizontal
tape line. The lamp on the
left (A) shows the correct
headlamp aim. The lamp on the
right (B) shows the incorrect
headlamp aim.
10. Repeat Steps 7 through 9 for the opposite headlamp.

Vehicle Care 9-33
Bulb Replacement
For the proper type of replacement
bulbs, seeReplacement Bulbson
page 9‑37.
For any bulb changing procedure
not listed in this section, contact
your dealer/retailer.
Halogen Bulbs
{WARNING
Halogen bulbs have pressurized
gas inside and can burst if you
drop or scratch the bulb. You or
others could be injured. Be sure
to read and follow the instructions
on the bulb package.
High Intensity Discharge
(HID) Lighting
{WARNING
The low beam high intensity
discharge lighting system
operates at a very high voltage.
If you try to service any of the
system components, you could be
seriously injured. Have your
dealer/retailer or a qualified
technician service them.
The up–level vehicle has HID
headlamps. The park lamp function
is also a function of the HID
headlamp. After an HID headlamp
bulb has been replaced, the beam
might be a slightly different shade
than it was originally. This is normal.
Headlamps, Front Turn
Signal and Parking
Lamps
Base Headlamp Assembly
The base model vehicle has a
halogen high-beam headlamp, a
low-beam/Daytime Running Lamp
(DRL) headlamp and a turn signal/
parking lamp on the headlamp
assembly.

9-34 Vehicle Care
To replace one of these bulbs:
1. Open the hood. SeeHood
on
page 9‑5.
A. Low-Beam Headlamp/DRL
B. High-Beam Headlamp
C. Parking/Turn Signal Lamp
2. If replacing a headlamp bulb, remove the dust cover from the
back of the headlamp housing
by turning counterclockwise
a quarter turn. 3. Remove the bulb socket from
the headlamp by turning
counterclockwise a quarter turn.
4. Remove the bulb from the socket.
5. Install the new bulb in the socket.
6. Install the bulb socket by turning clockwise a quarter turn.
7. If a headlamp bulb was replaced, Install the dust cover
in the back of the headlamp
housing by turning clockwise
a quarter turn.
Up–Level Headlamp Assembly
The up–level model vehicle has a
high intensity discharge (HID) high/
low beam, a dedicated DRL and a
turn signal lamp on the headlamp
assembly. The park lamp is also the
function of the HID headlamp. See
High Intensity Discharge (HID)
Lighting
on page 9‑33for more
information. To replace one of these bulbs:
1. Open the hood. See
Hood
on
page 9‑5.
A. DRL Lamp
B. Turn Signal Lamp
2. Turn the bulb socket counterclockwise to remove it
from the headlamp assembly.
3. Pull the bulb straight out from the socket.

Vehicle Care 9-35
4. Push the new bulb into thesocket and reinstall the socket
into the headlamp assembly by
turning it clockwise.
Fog Lamps
To replace one of these bulbs:
1. Locate the bulb assembly under
the front facia.
2. Disconnect the bulb socket from the electrical connector and pull
out the bulb assembly. 3. Remove the old bulb from the
bulb socket and push the new
bulb straight into the bulb socket
until it connects.
4. Push the bulb socket into the bulb assembly to lock it into
place.
5. Reconnect the bulb socket to the electrical connector.
Taillamps, Turn Signal,
Stoplamps, and Back-Up
Lamps
A. Turn Signal Lamp
B. Back–Up Lamp
To replace one of these lamps:
1. Open the trunk. See Trunk
on
page 1‑11.
2. Pull back the trunk trim.
3. Remove the four plastic wing nuts retaining the taillamp
assembly in place.

Vehicle Care 9-37
A. Bulb Socket
B. Lamp Assembly
C. Bulb
3. Turn the bulb socket (A) counterclockwise to remove from
lamp assembly (C).
4. Pull the bulb (B) straight out of the bulb socket. 5. Push the replacement bulb
straight into the bulb socket and
turn the bulb socket clockwise to
install into lamp assembly.
6. Move the lamp assembly into the trunk lid engaging the clip
side first.
7. Push on the lamp side opposite the clip until the lamp assembly
snaps into place.
Replacement Bulbs
Exterior Lamp Bulb
Number
Back-Up Lamp W16W
Daytime Running
Lamp (Up-Level) 3157K
Fog Lamp H11LL
Front Turn Signal/
Park Lamp 3757NAK
Headlamp High
Beam (Base) H9
Headlamp Low
Beam (Base) H11LL
License Plate Lamp W5WLL
Rear Turn Signal 3757AK
For replacement bulbs not listed
here, contact your dealer/retailer.

9-38 Vehicle Care
Electrical System
Electrical System
Overload
The vehicle has fuses and circuit
breakers to protect against an
electrical system overload.
When the current electrical load is
too heavy, the circuit breaker opens
and closes, protecting the circuit
until the current load returns to
normal or the problem is fixed. This
greatly reduces the chance of circuit
overload and fire caused by
electrical problems.
Fuses and circuit breakers protect
the following in the vehicle:
.Headlamp Wiring
.Windshield Wiper Motor
.Power Windows and other
Power Accessories
Headlamp Wiring
An electrical overload may cause
the lamps to go on and off, or in
some cases to remain off. Have the
headlamp wiring checked right away
if the lamps go on and off or
remain off.
Windshield Wipers
If the wiper motor overheats due to
heavy snow or ice, the windshield
wipers will stop until the motor cools
and will then restart.
Although the circuit is protected
from electrical overload, overload
due to heavy snow or ice, may
cause wiper linkage damage.
Always clear ice and heavy snow
from the windshield before using the
windshield wipers.
If the overload is caused by an
electrical problem and not snow or
ice, be sure to get it fixed.
Fuses and Circuit
Breakers
The wiring circuits in the vehicle are
protected from short circuits by a
combination of fuses and circuit
breakers. This greatly reduces the
chance of damage caused by
electrical problems.
To check a fuse, look at the
silver-colored band inside the fuse.
If the band is broken or melted,
replace the fuse. Be sure to replace
a bad fuse with a new one of the
identical size and rating.
Fuses of the same amperage can
be temporarily borrowed from
another fuse location, if a fuse goes
out. Replace the fuse as soon as
possible.
To identify and check fuses, circuit
breakers, and relays, seeEngine
Compartment Fuse Block
on
page 9‑39, Instrument Panel Fuse
Blockon page 9‑41, and Rear
Compartment Fuse Blockon
page 9‑43.

9-40 Vehicle Care
J-CaseFuses Usage
28 Rear Window
Defogger
41 Brake
Vacuum Pump
42 Cooling Fan K2
45 Cooling Fan K1
Mini Fuses Usage 1 Transmission
Control Module
2 Engine Control
Module Battery
5 Engine Control
Module Ignition
8 Ignition Coils ‐Even
9 Ignition Coils ‐Odd
10 Engine Control
Module Mini Fuses Usage
11 Post Catalytic
Converter Oxygen
Sensor Heater
13 Trans Ignition / Fuel
System Control
Module
16 MAF
17 Airbag Module
18 SBZ Ignition
23 Variable Effort
Steering
29 Power Lumbar, Left
32 Body Control
Module
33 Heated Seat
34 Antilock Brake
System Valves
35 Amplifier
36 AFL Ignition
37 Right High Beam Mini Fuses Usage
38 Left High Beam
46 Cooling Fan Relay
47 Pre Catalytic
Converter Oxygen
Sensor Heater
48 Fog Lamps
49 Right High Intensity
Discharge
Headlamp
50 Left High Intensity
Discharge
Headlamp
51 Horn
52 Cluster Ignition
53 Inside Rearview
Mirror, Rear Vision
Camera,
Vacuum Pump
54 Heating, Ventilation
and Air Conditioning

Vehicle Care 9-41
Mini Fuses Usage55 Outside Rear View
Mirror, Universal
Garage Door
Opener, Window
Switch
56 Windshield Washer
60 Heated Mirror
62 Canister Vent
64 AFL Battery
65 Theft Deterrent Horn
67 Fuel System Control
Module
69 Regulated Voltage
Control Sensor Mini Relays Usage
7 Engine Control
Module
9 Cooling Fan
13 Cooling Fan
15 Run / Crank
17 Rear Window
Defogger
Micro
Relays Usage
2 Starter
4 Wiper Speed
5 Wiper Control
10 Cooling Fan
14 Headlamp
Low BeamInstrument Panel Fuse
Block
The instrument panel fuse block is
located in the instrument panel, on
the driver side of the vehicle. To
access the fuses, open the fuse
panel door by pulling down at
the top.
Press in on the sides of the door to
release it from the instrument panel.