Page 354 of 470

Headlamp Aiming
Your vehicle has a visual optical headlamp aiming
system equipped with horizontal aim indicators. The aim
has been preset at the factory and should need no
further adjustment. This is true even though your
horizontal aim indicators may not fall exactly on
the “0” (zero) marks on their scales.
If your vehicle is damaged in an accident, the headlamp
aim may be affected. Aim adjustment to the low beam
may be necessary if it is difficult to see lane markers
(for horizontal aim), or if oncoming drivers ash
their high beams at you (for vertical aim).
If you believe your headlamps need to be re-aimed, we
recommend that you take your vehicle to your dealer
for service. However, it is possible for you to re-aim your
headlamps as described in the following procedure.Notice:To make sure your headlamps are aimed
properly, read all the instructions before beginning.
Failure to follow these instructions could cause
damage to headlamp parts.
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 or other at
surface.
The vehicle must have all four tires on a perfectly
level surface which is level all the way to the wall
or other at surface.
The vehicle should be placed so it is perpendicular
to the wall or other at surface.
The vehicle should not have any snow, ice or mud
attached to it.
The vehicle should be fully assembled and all other
work stopped while headlamp aiming is being done.
The vehicle should be normally loaded with a
full tank of fuel and one person or 160 lbs (75 kg) on
the driver’s seat.
Tires should be properly in ated.
Start the vehicle and rock it to level the suspension.
Headlamp aiming is done with the vehicle low-beam
lamps. The high-beam lamps will be correctly aimed if
the low-beam lamps are aimed properly.
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5. Turn the vertical aiming screw (V) until the
headlamp beam is aimed to the horizontal tape line.
The top edge of the cut-off should be positioned
at the bottom edge of the horizontal tape line.
6. Repeat Steps 4 and 5 for the opposite headlamp.
Bulb Replacement
For the proper type of replacement bulbs, see
Replacement Bulbs on page 5-58.
For any bulb changing procedure not listed in this
section, contact your dealer.
High Intensity Discharge (HID)
Lighting
{CAUTION:
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 or a quali ed technician service them.
Your vehicle may have HID headlamps. After your
vehicle’s HID headlamp bulb has been replaced, you
may notice that the beam is a slightly different
shade than it was originally. This is normal.
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Halogen Bulbs
{CAUTION:
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.
Headlamps
A. Low-Beam
Headlamp
B. Daytime Running
Lamp (DRL)
C. Sidemarker LampD. High-Beam
Headlamp
E. Front Parking/Turn
Signal Lamp
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Front Turn Signal, Sidemarker and
Daytime Running Lamps
A. Low-Beam
Headlamp
B. Daytime Running
Lamp (DRL)
C. Sidemarker LampD. High-Beam
Headlamp
E. Front Parking/Turn
Signal LampTo replace a front turn signal, sidemarker or DRL bulb,
do the following:
1. Remove the headlamp assembly as described
previously. SeeHeadlamps on page 5-52for
more information.
2. Remove the rubber, circular-shaped bulb cap for
the affected bulb from the headlamp assembly.
3. Press the locking release lever, turn the bulb
socket counterclockwise and remove it from
the headlamp assembly. (There is no lock for
the sidemarker lamp.)
4. Remove the old bulb from the bulb socket.
5. Put the new bulb into the bulb socket.
6. Put the bulb socket into the turn signal housing and
turn it clockwise until it locks. (There is no lock for
the sidemarker lamp.)
7. Reverse the steps to reinstall.
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Replacement Bulbs
Exterior Lamp Bulb Number
Back-up Lamp 3157K
Daytime Running Lamp (DRL) 4114K
Front Parking and Turn Signal
Lamps3157AK
High-Beam Headlamp 9005 or 9005 LL
Rear Turn Signal, Stoplamp and
Taillamp3157K
Sidemarker Lamp 194
For replacement bulbs not listed here, contact your
dealer.
Windshield Wiper Blade
Replacement
Windshield wiper blades should be inspected at least
twice a year for wear and cracking. SeeScheduled
Maintenance on page 6-5for more information.
Replacement blades come in different types and are
removed in different ways. For proper type and length,
seeNormal Maintenance Replacement Parts on
page 6-16.To replace the windshield wiper blade assembly do the
following:
1. Lift the wiper arm and turn the blade until it is
facing away from the windshield.
2. Push the release lever and slide the wiper assembly
toward the driver’s side of the vehicle.
3. Install a new blade by reversing Steps 1 and 2.
5-58
Page 420 of 470

Fuses Usage
IGN 1 PCM Ignition
PCM 1 Powertrain Control Module
ETC/ECMElectronic Throttle Control,
Electronic Brake Controller
INJ 1Ignition Coil, Fuel
Injectors - Bank 1
INJ 2Ignition Coil, Fuel
Injectors - Bank 2
IGN EInstrument Panel Cluster, Air
Conditioning Relay, Turn
Signal/Hazard Switch, Starter
Relay, Electronic Brake
Controller TC2 Mode Switch
RTDElectronic Brake Controller
Battery Feed
TRL B/U Backup Lamps Trailer Wiring
PCM BPowertrain Control Module,
Fuel Pump
F/PMP Fuel Pump (Relay)
02A Oxygen SensorsFuses Usage
B/U LPBack-up Lamps, Automatic
Transmission Shift Lock
Control System
RR DEFOG Rear Window Defogger
HDLP - HI Headlamp High Beam Relay
PRIME Not Used
O2B Oxygen Sensors
AIRBAGSupplemental In atable
Restraint System
FRT PARKFront Parking Lamps,
Sidemarker Lamps
DRLDaytime Running
Lamps (Relay)
SEO IGN Rear Defog Relay
TBC IGN1 Truck Body Controller Ignition
HI HDLP - LT High Beam Headlamp - Left
LH HID Not Used
DRL Daytime Running Lamps
RVC Regulated Voltage Control
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Fuses Usage
IPC/DICInstrument Panel Cluster/
Driver Information Center
HVAC/ECASClimate Control Controller/
Electronically Controlled
Air Suspension
CIG LTR Cigarette Lighter
HI HDLP - RT High Beam Headlamp - Right
HDLP - LOW Headlamp Low Beam Relay
A/C COMPAir Conditioning
Compressor Relay
A/C COMP Air Conditioning Compressor
RR WPR Rear Wiper/Washer
RADIO Audio System
SEO B1Mid Bussed Electrical
Center, HomeLink, Rear
Heated Seats
LO HDLP - LT Headlamp Low Beam - Left
BTSIBrake Transmission Shift
Interlock SystemFuses Usage
CRNK Starting System
LO HDLP-RT Headlamp Low Beam-Right
FOG LP Not Used
FOG LP Not Used
HORN Horn Relay
W/S WASHWindshield and Rear Window
Washer Pump Relay
W/S WASHWindshield and Rear Window
Washer Pump
INFO OnStar
®
RADIO AMP Radio Ampli er
RH HID Not Used
HORN Horn
EAP Not Used
TREC All-Wheel Drive Module
SBA Not Used
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Page 462 of 470

Fuel............................................................... 5-5
Additives...................................................... 5-7
California Fuel.............................................. 5-6
Filling a Portable Fuel Container....................5-10
Filling Your Tank........................................... 5-8
Fuels in Foreign Countries.............................. 5-8
Gage.........................................................3-48
Gasoline Octane........................................... 5-5
Gasoline Speci cations.................................. 5-6
Low Warning Light.......................................3-49
Fuses
Center Instrument Panel Fuse Block.............5-110
Fuses and Circuit Breakers.........................5-107
Instrument Panel Fuse Block.......................5-107
Underhood Fuse Block...............................5-111
Windshield Wiper.......................................5-106
G
Gage
Engine Coolant Temperature.........................3-41
Fuel..........................................................3-48
Oil Pressure...............................................3-46
Speedometer..............................................3-33
Tachometer.................................................3-33
Transmission Temperature.............................3-41
Voltmeter Gage...........................................3-37
Garage Door Opener.......................................2-36Gasoline
Octane........................................................ 5-5
Speci cations............................................... 5-6
Glove Box.....................................................2-40
GM Mobility Reimbursement Program.................. 7-5
H
Hazard Warning Flashers................................... 3-6
Head Restraints............................................... 1-7
Headlamp
Aiming.......................................................5-48
Horizontal Aiming.........................................5-49
Vertical Aiming............................................5-50
Headlamps....................................................5-52
Automatic Headlamp System.........................3-15
Bulb Replacement.......................................5-51
Daytime Running Lamps...............................3-15
Flash-to-Pass............................................... 3-8
Front Turn Signal, Sidemarker and
Daytime Running Lamps...........................5-56
Halogen Bulbs............................................5-52
High Intensity Discharge (HID) Lighting...........5-51
High/Low Beam Changer................................ 3-8
On Reminder..............................................3-15
Heated Seats....................................1-4, 1-5, 1-10
Heater...........................................................3-22
Highbeam On Light.........................................3-48
6