2010 GMC YUKON 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 an
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 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.
6-57

Bulb Replacement
For the proper type of replacement bulbs, see
Replacement Bulbs on page 6‑60.
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 Back-up Lamps
If your vehicle is a Two-mode Hybrid, see the
Two-mode Hybrid supplement for the bulb changing
procedure.
A. Taillamp/TurnSignal Lamp
B. Back-up Lamp
C. Stoplamp/Taillamp
6-58

To replace one of these bulbs:1. Open the liftgate. See Power Liftgate
on
page 3‑15.
2. Remove the two screws from the
taillamp assembly.
3. Pull the taillamp assembly rearward until you disengage the inner pins on the taillamp assembly
from the vehicle. 4. Press the release tab, if bulb socket has one, and
turn the bulb socket counterclockwise to remove it
from the taillamp assembly.
5. Pull the old bulb straight out from the bulb socket.
6. Press a new bulb into the bulb socket and insert it into the taillamp assembly. Turn the bulb socket
clockwise into the taillamp assembly until it clicks.
7. Reinstall the taillamp assembly. When reinstalling, make sure to line up the pins on the taillamp
assembly with the vehicle. If you do not do this,
you will not be able correctly install the taillamp
assembly.
6-59

License Plate Lamp
1. Remove the two screws holding each of thelicense plate lamps to the molding that is part of
the liftgate.
2. Twist and pull the license plate lamp forward through the molding opening. 3. Turn the bulb socket counterclockwise and pull the
bulb straight out of the socket.
4. Install the new bulb.
5. Reverse Steps 1 through 3 to reinstall the license plate lamp.
Replacement Bulbs
If your vehicle is a Two-mode Hybrid, see the
Two-mode Hybrid manual for more information.
Exterior Lamp Bulb Number
Back-up Lamp 7441
License Plate Lamp 168
Rear Turn Signal Lamp, Taillamp, and
Stoplamp 3057KX
For replacement bulbs not listed here, contact your
dealer.
6-60

Windshield Wiper Blade
Replacement
Windshield wiper blades should be inspected for wear
or cracking. SeeScheduled Maintenance on page 7‑3.
Replacement blades come in different types and are
removed in different ways. To replace the wiper blade
assembly: 1. Pull the windshield wiper arm connector away from the windshield.
2. Squeeze the grooved areas on each side of the
blade, and turn the blade assembly away from the
arm connector.
3. Install the new blade onto the arm connector andmake sure the grooved areas are fully set in the
locked position.
For the proper type and size, see Maintenance
Replacement Parts on page 7‑13.
6-61

Backglass Wiper Blade Replacement
1. Lift the wiper blade assembly up and out of thepark rest position.
2. Pull the wiper blade assembly away from thebackglass. The backglass wiper blade will not lock
in a vertical position, so care should be used when
pulling it away from the vehicle.
3. Turn the wiper blade assembly, and pull it off of the wiper arm. Hold the wiper arm in position and push
the blade away from the wiper arm.
4. Replace the wiper blade.
5. Return the wiper blade assembly to the park restposition.
6-62

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 5‑31.
.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
(Continued)
WARNING: (Continued)
should be checked when your vehicle's
tires are cold. See Inflation - Tire
Pressure
on page 6‑72.
.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.
20‐Inch Tires
If your vehicle has the optional 20‐inch
P275/55R20 size tires, they are classified
as touring tires and are designed for on road
use. The low‐profile, wide tread design is not
recommended for off‐road driving. See Off-Road
Driving
on page 5‑12, for additional information.
6-63

Tire Sidewall Labeling
Useful information about a tire is molded into the
sidewall. The following illustrations are examples
of a typical P‐Metric and a LT‐Metric tire sidewall.
Passenger (P‐Metric) Tire
(A) Tire Size:The tire size code 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 code are 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.
6-64