2010 BUICK LUCERNE Owner's Manual

7. Locate the vertical headlamp aiming screws, whichare under the hood near each headlamp assembly.
The adjustment screw can be turned with a 6 mm
male hex.
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 the headlamp 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.
6-51

Bulb Replacement
For the proper type of replacement bulbs, see
Replacement Bulbs on page 6‑55.
For any bulb changing procedure not listed in this
section, contact your dealer.
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.
Taillamps, Turn Signal, Stoplamps
and Sidemarker Lamps
A. Sidemarker Lamp
B. Stoplamp/Taillamp/Turn Signal Lamp
6-52

To replace one of these bulbs:1. Open the trunk. See Trunk on page 3‑12.
2. Remove the convenience net.
3. Remove the plastic wing nuts retaining the trunk trim.
4. Pull back the trunk trim.
5. Remove the three hex nuts holding the taillamp assembly in place.
6. Pull the taillamp assembly straight out. 7. Turn the bulb socket counterclockwise and pull it
straight out to remove it.
8. Pull the old bulb straight out of the socket.
9. Push the new bulb straight in until it clicks.
10. Push the bulb socket in and turn it clockwise to secure it in the taillamp assembly.
11. Push the taillamp assembly straight in to its original location.
When reinstalling the taillamp assembly, make
sure the plastic pin on the taillamp assembly lines
up and is inserted correctly into the opening of the
vehicle.
12. Reinstall the three hex nuts holding the taillamp assembly in place.
13. Put the trunk trim back into place.
14. Reinstall the plastic wing nuts that retain the trunk trim.
15. Put the convenience net back in its original location.
6-53

Taillamps and Back-Up Lamps
A. Taillamp
B. Back-up Lamp
To replace an auxiliary taillamp or back-up lamp bulb: 1. Open the trunk. See Trunk on page 3‑12.
2. Remove the three fasteners from the trunk trim.
3. Pull back the trunk trim to access the bulbs.
4. Turn the bulb socket counterclockwise to
remove it.
5. Pull the bulb straight out.
6. Push the bulb straight in until it clicks.
7. Push the bulb socket in and turn it clockwise to secure it.
8. Put the trunk trim and three fasteners back into place.
6-54

License Plate Lamp
To replace one of these bulbs:1. Remove the license plate.
2. Reach up through the opening above the license plate to access the two license plate lamps.
3. Turn the socket counterclockwise to remove.
4. Grasp the bulb in the socket and pull straight out.
5. Push the bulb straight into the socket until it clicks to secure it.
6. Push the socket in and turn it clockwise to secure it.
7. Reinstall the license plate in its original location.
Replacement Bulbs
Exterior Lamps Bulb Number
Back-up Lamp 921
Sidemarker, License Plate Lamp,
and Auxiliary Taillamp 194
Stoplamp, Taillamp, and Turn
Signal Lamp 3057K
For replacement bulbs not listed here, contact your
dealer.
Windshield Wiper Blade
Replacement
Windshield wiper blades should be inspected for wear
or cracking. See
Scheduled Maintenance on page 7‑3.
It is a good idea to clean or replace the wiper blade
assembly on a regular basis or when worn. For
proper windshield wiper blade length and type, see
Maintenance Replacement Parts on page 7‑11.
To replace the wiper blade assembly: 1. Turn the ignition to ACC/ACCESSORY with the engine off.
2. Pull the windshield wiper assembly away from the windshield.
6-55

3. Squeeze the tabs on each side of the wiper bladeassembly and slide the assembly off the end of the
wiper arm.4. Replace the blade assembly with a new one.
Allowing the wiper blade arm to touch the
windshield when no wiper blade is installed could
damage the windshield. Any damage that occurs
would not be covered by your warranty. Do not
allow the wiper blade arm to touch the windshield.
5. Repeat the steps for the other wiper.
6-56

Tires
Your new vehicle comes with high-quality tires
made by a leading tire manufacturer. If you ever
have questions about your tire warranty and
where to obtain service, see your vehicle
Warranty booklet for details. For additional
information refer to the tire manufacturer.
{WARNING:
Poorly maintained and improperly used tires
are dangerous.
.Overloading your vehicle's tires can
cause overheating as a result of too
much flexing. You could have an air-out
and a serious accident. SeeLoading the
Vehicle
on page 5‑19.
(Continued)
WARNING: (Continued)
.Underinflated tires pose the same danger
as overloaded tires. The resulting
accident could cause serious injury.
Check all tires frequently to maintain the
recommended pressure. Tire pressure
should be checked when your vehicle's
tires are cold. See Inflation - Tire
Pressure
on page 6‑65.
.Overinflated tires are more likely to be
cut, punctured, or broken by a sudden
impact —such as when you hit a pothole.
Keep tires at the recommended pressure.
.Worn, old tires can cause accidents.
If the tire's tread is badly worn, or if your
vehicle's tires have been damaged,
replace them.
6-57

Tire Sidewall Labeling
Useful information about a tire is molded into its
sidewall. The examples below show a typical
passenger vehicle tire and a compact spare tire
sidewall.
Passenger (P‐Metric) Tire Example
(A) Tire Size:The tire size is a combination of
letters and numbers used to define a particular
tire's width, height, aspect ratio, construction type,
and service description. See the “Tire Size”
illustration later in this section for more detail.
(B) TPC Spec (Tire Performance Criteria
Specification)
:Original equipment tires designed
to GM's specific tire performance criteria have a
TPC specification code molded onto the sidewall.
GM's TPC specifications meet or exceed all
federal safety guidelines.
(C) DOT (Department of Transportation)
:The
Department of Transportation (DOT) code
indicates that the tire is in compliance with the
U.S. Department of Transportation Motor Vehicle
Safety Standards.
(D) Tire Identification Number (TIN)
:The letters
and numbers following DOT (Department of
Transportation) code is the Tire Identification
Number (TIN). The TIN shows the manufacturer
and plant code, tire size, and date the tire was
manufactured. The TIN is molded onto both sides
of the tire, although only one side may have the
date of manufacture.
6-58