2010 BUICK LACROSSE turn signal bulb

5-4 Lighting
Hazard Warning Flashers
|
Hazard Warning Flasher:
Press this button located on the
instrument panel below the climate
control system, to make the front
and rear turn signal lamps flash on
and off. Press again to turn the
flashers off.
The hazard warning flashers turn on
automatically if the airbags deploy.
Turn and Lane-Change
Signals
Move the lever all the way up or
down to signal a turn.
An arrow on the instrument panel
cluster flashes in the direction of the
turn or lane change. Raise or lower the lever until the
arrow starts to flash to signal a lane
change. Hold it there until the lane
change is completed. If the lever is
briefly pressed and released, the
turn signal flashes three times.
The turn and lane-change signal
can be turned off manually by
moving the lever back to its original
position.
If after signaling a turn or lane
change the arrow flashes rapidly or
does not come on, a signal bulb
might be burned out.
Have the bulbs replaced. If the bulb
is not burned out, check the fuse.
See
Fuses and Circuit Breakers
on
page 9‑38.

8-56 Driving and Operating
Backing Up
Hold the bottom of the steering
wheel with one hand. To move the
trailer to the left, move that hand to
the left. To move the trailer to the
right, move your hand to the right.
Always back up slowly and,
if possible, have someone
guide you.
Making Turns
Notice:Making very sharp turns
while trailering could cause the
trailer to come in contact with the
vehicle. The vehicle could be
damaged. Avoid making very
sharp turns while trailering.
When turning with a trailer, make
wider turns than normal so the
trailer will not strike soft shoulders,
curbs, road signs, trees or other
objects. Use the turn signal well in
advance and avoid jerky or sudden
maneuvers.
Turn Signals When Towing a
Trailer
The turn signal indicators on the
instrument panel flash whenever
signaling a turn or lane change.
Properly hooked up, the trailer
lamps also flash, telling other
drivers the vehicle is turning,
changing lanes or stopping.
When towing a trailer, the arrows on
the instrument panel flash for turns
even if the bulbs on the trailer are
burned out. Check occasionally to
be sure the trailer bulbs are still
working.
Driving On Grades
Reduce speed and shift to a lower
gear before starting down a long or
steep downgrade. If the
transmission is not shifted down, the
brakes might have to be used so
much that they would get hot and no
longer work well.
The vehicle can tow in D (Drive).
Use a lower gear if the transmission
shifts too often. When towing at high altitude on
steep uphill grades, engine coolant
boils at a lower temperature than at
normal altitudes. If the engine is
turned off immediately after towing
at high altitude on steep uphill
grades, the vehicle could show
signs similar to engine overheating.
To avoid this, let the engine run
while parked, preferably on level
ground, with the transmission in
P (Park) for a few minutes before
turning the engine off. If the
overheat warning comes on, see
Engine Overheating on page 9‑20.
Parking on Hills
{WARNING
Parking the vehicle on a hill with
the trailer attached can be
dangerous. If something goes
wrong, the rig could start to move.
People can be injured, and both
the vehicle and the trailer can be
damaged. When possible, always
park the rig on a flat surface.

Vehicle Care 9-1
Vehicle Care
General Information
General Information . . . . . . . . . . . 9-2
California Proposition65 Warning . . . . . . . . . . . . . . . . . . 9-2
California Perchlorate Materials Requirements . . . . . . . . . . . . . . . 9-3
Accessories and Modifications . . . . . . . . . . . . . . . . 9-3
Vehicle Checks
Doing Your OwnService Work . . . . . . . . . . . . . . . . 9-4
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5
Engine Compartment Overview . . . . . . . . . . . . . . . . . . . . 9-6
Engine Oil . . . . . . . . . . . . . . . . . . . 9-11
Engine Oil Life System . . . . . . 9-13
Automatic Transmission Fluid . . . . . . . . . . . . . . . . . . . . . . . 9-15
Engine Air Cleaner/Filter . . . . . 9-15
Cooling System . . . . . . . . . . . . . . 9-17
Engine Coolant . . . . . . . . . . . . . . 9-18
Engine Overheating . . . . . . . . . 9-20
Overheated Engine Protection Operating Mode . . . . . . . . . . . . 9-21
Power Steering Fluid . . . . . . . . 9-22 Washer Fluid . . . . . . . . . . . . . . . . 9-23
Brakes . . . . . . . . . . . . . . . . . . . . . . . 9-24
Brake Fluid . . . . . . . . . . . . . . . . . . 9-25
Battery . . . . . . . . . . . . . . . . . . . . . . . 9-26
Starter Switch Check . . . . . . . . 9-27
Automatic Transmission Shift
Lock Control System
Check . . . . . . . . . . . . . . . . . . . . . . 9-27
Ignition Transmission Lock Check . . . . . . . . . . . . . . . . . . . . . . 9-28
Park Brake and P (Park) Mechanism Check . . . . . . . . . 9-28
Wiper Blade Replacement . . . 9-29Headlamp Aiming
Headlamp Aiming . . . . . . . . . . . . 9-30
Bulb Replacement
Bulb Replacement . . . . . . . . . . . 9-33
Halogen Bulbs . . . . . . . . . . . . . . . 9-33
High Intensity Discharge (HID) Lighting . . . . . . . . . . . . . . . . . . . . 9-33
Headlamps, Front Turn Signal and Parking Lamps . . . . . . . . . 9-33
Fog Lamps . . . . . . . . . . . . . . . . . . 9-35 Taillamps, Turn Signal,
Stoplamps, and Back-Up
Lamps . . . . . . . . . . . . . . . . . . . . . . 9-35
License Plate Lamp . . . . . . . . . . 9-36
Replacement Bulbs . . . . . . . . . . 9-37
Electrical System
Electrical System Overload . . . . . . . . . . . . . . . . . . . 9-38
Fuses and Circuit Breakers . . . . . . . . . . . . . . . . . . . 9-38
Engine Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . 9-39
Instrument Panel Fuse Block . . . . . . . . . . . . . . . . . . . . . . . 9-41
Rear Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . 9-43
Wheels and Tires
Tires . . . . . . . . . . . . . . . . . . . . . . . . . 9-46
Winter Tires . . . . . . . . . . . . . . . . . . 9-46
Tire Sidewall Labeling . . . . . . . 9-47
Tire Designations . . . . . . . . . . . . 9-49
Tire Terminology and
Definitions . . . . . . . . . . . . . . . . . . 9-50
Tire Pressure . . . . . . . . . . . . . . . . 9-53
Tire Pressure Monitor System . . . . . . . . . . . . . . . . . . . . . 9-54

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.

9-36 Vehicle Care
4. Pull out the taillamp assemblyand disconnect the wiring
harness.
A. Back-up Lamp
B. Turn Signal Lamp
5. Turn the bulb socket counterclockwise to remove it.
6. Pull the old bulb straight out of the bulb socket. 7. Push the new bulb straight into
the bulb socket until it clicks.
8. Turn the bulb socket clockwise to reinstall.
9. Reconnect the wiring harness.
10. Push the taillamp assembly back into place on the vehicle.
11. Turn the four wing nuts clockwise to reinstall them.
12. Place the trunk trim to its original location.
License Plate Lamp
The licence plate lamps for this
vehicle are on the trunk lid.
To replace one of these bulbs:
1. Open the trunk. See Trunk
on
page 1‑11for more information.
2. Push the end on either of the lamp assemblies (passenger
side shown) and then move the
lamp assembly down to remove
it from trunk lid.

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.