headlamp GMC YUKON 2007 Owner's Guide

Trailer Wiring Harness
Heavy-Duty Trailer Wiring Package
Your vehicle is equipped with the seven-wire
trailer towing harness. This harness with a
seven-pin universal heavy-duty trailer connector is
attached to the rear bumper beam. It is located
next to the integrated trailer hitch.The seven-wire harness contains the following
trailer circuits:
Yellow: Left Stop/Turn Signal
Dark Green: Right Stop/Turn Signal
Brown: Taillamps
White: Ground
Light Green: Back-up Lamps
Red w/ Black Stripe: Battery Feed*
Dark Blue: Trailer Brake*
*The fuses for these two circuits are installed in
the underhood electrical center, but the circuits are
not connected. They should be installed by your
dealer or a qualied service center.
If you are charging a remote (non-vehicle) battery,
press the tow/haul mode button located at the
end of the shift lever. This will boost the vehicle
system voltage and properly charge the battery.
If the trailer is too light for tow/haul mode, you can
turn on the headlamps as a second way to
boost the vehicle system and charge the battery.
414

Service........................................................ 420
Accessories and Modications................... 421
California Proposition 65 Warning.............. 421
Doing Your Own Service Work.................. 422
Adding Equipment to the Outside
of Your Vehicle...................................... 423
Fuel............................................................. 423
Gasoline Octane........................................ 423
Gasoline Specications.............................. 424
California Fuel........................................... 424
Additives................................................... 424
Fuels in Foreign Countries........................ 425
Filling the Tank......................................... 426
Filling a Portable Fuel Container............... 428
Checking Things Under the Hood.............. 428
Hood Release........................................... 429
Engine Compartment Overview.................. 430
Engine Oil................................................. 432
Engine Oil Life System.............................. 435Engine Air Cleaner/Filter............................ 437
Automatic Transmission Fluid.................... 440
Engine Coolant.......................................... 445
Coolant Surge Tank Pressure Cap............ 448
Engine Overheating................................... 448
Overheated Engine Protection
Operating Mode..................................... 450
Cooling System......................................... 451
Engine Fan Noise..................................... 456
Power Steering Fluid................................. 457
Windshield Washer Fluid........................... 458
Brakes...................................................... 459
Battery...................................................... 463
Jump Starting............................................ 464
All-Wheel Drive........................................... 469
Rear Axle.................................................... 470
Front Axle................................................... 471
Headlamp Aiming........................................ 473
Section 5 Service and Appearance Care
417

Headlamp Aiming
The vehicle has a visual optical headlamp aiming
system. The aim of the headlamps have been
preset at the factory and should need no further
adjustment.
However, if the vehicle is damaged in an accident,
the aim of the headlamps may be affected and
adjustment may be necessary.
If oncoming vehicles ash their high beams at
you, this may mean the vertical aim of your
headlamps needs to be adjusted.
It is recommended that the vehicle is taken to your
dealer for service if the headlamps need to be
adjusted. It is possible however, to re-aim the
headlamps as described in the following procedure.
The vehicle should be properly prepared as follows:
The vehicle should be placed so the headlamps
are 25 ft. (7.6 m) from a light colored wall.
The vehicle must have all four tires on a level
surface which is level all the way to the wall.
The vehicle should be placed so it is
perpendicular to the wall.
The vehicle should not have any snow, ice,
or mud on it.
The vehicle should be fully assembled and all
other work stopped while headlamp aiming is
being performed.
The vehicle should be normally loaded with a
full tank of fuel and one person or 160 lbs
(75 kg) sitting on the driver’s seat.
Tires should be properly inated.
The spare tire is in its proper location in the
vehicle.
Headlamp aiming is done with the vehicle’s
low-beam headlamps. The high-beam headlamps
will be correctly aimed if the low-beam headlamps
are aimed properly.
473

To adjust the vertical aim, do the following:
1. Open the hood. SeeHood Release on
page 429for more information.
2. Locate the aim dot on the lens of the
low-beam headlamp.
3. Measure the distance from the ground to
the aim dot on the low-beam headlamp.
Record the distance.4. At the wall or other at surface, measure from
the ground upward (A) to the recorded
distance from Step 3 and mark it.
5. Draw or tape a horizontal line (B) on the wall
or at surface the width of the vehicle at the
height of the mark in Step 4.
Notice:Do not cover a headlamp to improve
beam cut-off when aiming. Covering a
headlamp may cause excessive heat build-up
which may cause damage to the headlamp.
6. Turn on the low-beam headlamps and place a
piece of cardboard or equivalent in front of the
headlamp not being adjusted. This allows
only the beam of light from the headlamp
being adjusted to be seen on the at surface.
474

7. 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 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.
475

Wheel Replacement
Replace any wheel that is bent, cracked, or badly
rusted or corroded. If wheel nuts keep coming
loose, the wheel, wheel bolts, and wheel
nuts should be replaced. If the wheel leaks air,
replace it (except some aluminum wheels,
which can sometimes be repaired). See your
dealer if any of these conditions exist.
Your dealer will know the kind of wheel you need.
Each new wheel should have the same
load-carrying capacity, diameter, width, offset
and be mounted the same way as the one
it replaces.
If you need to replace any of your wheels, wheel
bolts, or wheel nuts, replace them only with
new GM original equipment parts. This way,
you will be sure to have the right wheel, wheel
bolts, and wheel nuts for your vehicle.{CAUTION:
Using the wrong replacement wheels,
wheel bolts, or wheel nuts on your vehicle
can be dangerous. It could affect the
braking and handling of your vehicle,
make your tires lose air and make you
lose control. You could have a collision
in which you or others could be injured.
Always use the correct wheel, wheel bolts,
and wheel nuts for replacement.
Notice:The wrong wheel can also cause
problems with bearing life, brake cooling,
speedometer or odometer calibration,
headlamp aim, bumper height, vehicle ground
clearance, and tire or tire chain clearance
to the body and chassis.
SeeChanging a Flat Tire on page 506for more
information.
503

Fuses Usage
1 Not Used
2Electronic Stability Suspension
Control, Automatic Level Control
Exhaust
3 Left Trailer Stop/Turn Lamp
4 Engine Controls
5Engine Control Module,
Throttle Control
6 Right Trailer Stop/Turn Lamp
7 Front Washer
8 Oxygen Sensors
9 Anti-lock Brakes System 2
10 Trailer Back-up Lamps
11 Driver’s Side Low-Beam Headlamp
12 Engine Control Module (Battery)
13Fuel Injectors, Ignition Coils
(Right Side)
14Transmission Control Module
(Battery)
15 Vehicle Back-up LampsFuses Usage
16Passenger’s Side Low-Beam
Headlamp
17 Air Conditioning Compressor
18 Oxygen Sensors
19 Transmission Controls (Ignition)
20 Fuel Pump
21 Not Used
22 Rear Washer
23Fuel Injectors, Ignition Coils
(Left Side)
24 Trailer Park Lamps
25 Driver’s Side Park Lamps
26 Passenger’s Side Park Lamps
27 Fog Lamps
28 Horn
29Passenger’s Side High-Beam
Headlamp
30 Daytime Running Lamps
31 Driver’s Side High-Beam Headlamp
543

J-Case Fuses Usage
60 Cooling Fan 1
61 Automatic Level Control Compressor
62 Heavy Duty Anti-lock Brake System
63 Cooling Fan 2
64 Anti-lock Brake System 1
65 Starter
66 Stud 2 (Trailer Brakes)
67 Left Bussed Electrical Center 1
68 Electric Running Boards
69 Heated Windshield Washer System
70 Not Used
71Stud 1 (Trailer Connector
Battery Power)
72 Mid-Bussed Electrical Center 1
73 Climate Control Blower
74 Power Liftgate Module
75 Left Bussed Electrical Center 2Relays Usage
FAN HI Cooling Fan High Speed
FAN LO Cooling Fan Low Speed
ENG EXH VLV Not Used
FAN CNTRL Cooling Fan Control
HDLP LO/HID Low-Beam Headlamps
FOG LAMP Front Fog Lamps
A/C CMPRSR Air Conditioning Compressor
STRTR Starter
PWR/TRN Powertrain
FUEL PMP Fuel Pump
PRK LAMP Parking Lamps
REAR DEFOG Rear Defogger
RUN/CRANK Switched Power
545

Appearance Care (cont.)
Leather.................................................... 529
Sheet Metal Damage............................... 533
Speaker Covers....................................... 530
Tires........................................................ 533
Underbody Maintenance........................... 534
Vehicle Care/Appearance Materials.......... 535
Washing Your Vehicle.............................. 530
Weatherstrips........................................... 530
Windshield, Backglass, and Wiper
Blades.................................................. 532
Wood Panels........................................... 530
Ashtray(s).................................................... 214
Audio System(s).......................................... 272
Audio Steering Wheel Controls................. 335
Care of Your CD and DVD Player............ 338
Care of Your CDs and DVDs................... 338
Navigation/Radio System, see Navigation
Manual................................................. 321
Radio with CD and DVD.......................... 294
Radio with Six-Disc CD............................ 276
Rear Seat Audio (RSA)............................ 333
Rear Side Window Antenna..................... 338
Setting the Time..............................274, 275
Theft-Deterrent Feature............................ 335Audio System(s) (cont.)
Understanding Radio Reception............... 336
XM™ Satellite Radio Antenna System...... 339
Automatic Headlamp System....................... 205
Automatic Transmission
Fluid........................................................ 440
Operation................................................. 145
Autoride
®..................................................... 399
B
Battery........................................................ 463
Run-Down Protection............................... 208
Before Leaving on a Long Trip.................... 382
Bench Seat, Split (60/40).............................. 18
Brake
Anti-Lock Brake System (ABS)................. 347
Emergencies............................................ 349
Parking.................................................... 152
System Warning Light.............................. 233
Brake Pedal, Throttle................................... 143
Brakes........................................................ 459
Braking....................................................... 346
Braking in Emergencies............................... 349
Break-In, New Vehicle................................. 139
594

Bucket Seats, Rear....................................... 25
Bulb Replacement....................................... 476
Halogen Bulbs......................................... 476
Headlamp Aiming..................................... 473
License Plate Lamps................................ 477
Replacement Bulbs.................................. 478
Taillamps, Turn Signal, Stoplamps and
Back-up Lamps..................................... 476
Buying New Tires........................................ 498
C
Calibration................................................... 158
California Fuel............................................. 424
California Proposition 65 Warning................ 421
Canadian Owners........................................... 3
Capacities and Specications...................... 546
Carbon Monoxide.....126, 128, 156, 386, 400
Care of
Safety Belts............................................. 530
Your CD and DVD Player........................ 338
Your CDs and DVDs................................ 338
Cargo Cover............................................... 181Cargo Management System........................ 182
Center Console Storage Area...................... 179
Center Front Passenger Position, Safety
Belts.......................................................... 52
Chains, Tire................................................. 504
Charging System Light................................ 232
Check
Engine Light............................................ 237
Checking Things Under the Hood................ 428
Chemical Paint Spotting.............................. 534
Child Restraints
Child Restraint Systems............................. 68
Infants and Young Children........................ 64
Lower Anchors and Tethers for Children..... 74
Older Children........................................... 61
Securing a Child Restraint in a Rear Seat
Position.................................................. 83
Securing a Child Restraint in the Center
Front Seat Position................................. 85
Securing a Child Restraint in the Right
Front Seat Position................................. 86
Where to Put the Restraint........................ 72
Cigarette Lighter.......................................... 214
595