Page 365 of 468

7. Turn the bulb socket one-quarter turn
counterclockwise to remove it from the assembly.
8. Replace the bulb. SeeReplacement Bulbs on
page 5-58for the proper bulb number.
9. Reverse Steps 1 through 7 to reinstall the bulb
socket and access cap.
Sidemarker Lamps
This procedure is for replacing the sidemarker bulb only.
If you need to replace the parking lamp bulb or
halogen headlamp as well, seeHeadlamps, Sidemarker,
and Parking Lamps on page 5-55.
1. Use a tool to remove the fasteners that attach the
front fascia extension panel in the wheelhouse.
2. Reach forward past the wheelhouse to the front
sidemarker socket in the outboard side of the
headlamp assembly.
3. Rotate the front sidemarker socket one-eighth turn
counterclockwise to remove it.
4. Replace the bulb. SeeReplacement Bulbs on
page 5-58for the proper bulb number.
5. Reinstall the socket to the headlamp assembly.
6. Replace the fasteners that attach the front fascia
extension panel in the wheelhouse.
Center High-Mounted Stoplamp
(CHMSL)
It is recommended that this component be replaced as
a unit. See your dealer.
Taillamps, Turn Signal, Stoplamps
and Sidemarker Lamps
It is recommended that this component be replaced as
a unit. See your dealer.
Back-Up and License Plate Lamps
To replace the back-up and/or license plate lamps, use
the following procedure:
1. Open the liftgate.
2. Remove the liftgate trim panel on the interior of the
liftgate by pulling the trim panel snap-in fasteners
out of the retainers and also by using a tool to
remove the screw on the bottom right side of the
trim panel.
3. Disconnect the courtesy lamp electrical connector
on the trim panel.
4. Use a tool to remove the ve nuts on the back of
the license plate applique assembly.
5-57
Page 366 of 468
5. Remove the license plate applique assembly from
the liftgate by pulling the assembly rearward to
disengage the two snap-in retainer clips at the back
of the license plate applique assembly near the
liftgate panel.
6. For the back-up lamp, turn the bulb socket
one-quarter turn counterclockwise to remove.
For the license lamp, slide the license lamp
assembly out of the license plate applique
assembly, and turn the bulb socket one-quarter turn
counterclockwise to remove.
7. Replace the bulb. SeeReplacement Bulbs on
page 5-58for the proper bulb number.
8. Reverse Steps 1 through 6 to reinstall the license
plate applique assembly.Replacement Bulbs
For any bulb not listed here contact your dealer.
Exterior Lamp Bulb Number
Back-Up Lamp 3157KX
Fog Lamp 9145
Front Sidemarker W5WLL
Front Turn Signal Lamp/DRLGM Part
No. 10319395
Headlamp High-Beam 9005XS LL
Headlamp Low-Beam 9006XS LL
Parking Lamp
With Halogen Low Beam W5WLL
With HID Low Beam W5W B50X2
5-58
Page 384 of 468

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 5-79for more
information.
5-76
Page 412 of 468
Relays Usage
LO SPEED
FAN RELAY
MINILow Speed Fan Motor
HI SPEED FAN
RELAY MINIHigh Speed Fan Motor
ACCESSORY
RELAY MINIAccessory Power Outlets
S/P FAN
RELAY MINISeries/Parallel Fan
PARK LAMP
RELAY MICROParking Lamps
Relays Usage
HORN RELAY
MICROHorn
HI BEAM
RELAY MICROHigh-Beam Headlamps
DRL RELAY
MICRO-OPTDaytime Running Lamps
LO BEAM
RELAY/HID
MINI-OPTLow-Beam HID Headlamps (Option)
HDLP WASH
RELAY
MINI-OPTHeadlamp Washer Motor (Option)
SPARE Not Used
BLOWER
RELAY MINIFront Blower
FOG LAMP
RELAY MICROFog Lamps
MAIN RELAY
MICROPowertrain/ECM
STARTER
RELAY MINIStarter Solenoid
CMP CLU
RELAY MICROCompressor Clutch
IGN-1 RELAY
MICROIgnition Switch (ON)
5-104
Page 413 of 468

Wiring
HarnessesUsage
BODY W/H Wiring Harness Connection
I/P W/H Wiring Harness Connection
ENG W/H Engine Wiring Harness Connection
FORWARD
LAMPForward Lamp Wiring Harness
Connection
J Cases Usage
R REARRRPDB (Passenger’s Side Rear
Power Distribution Box)
R REARRRPDB (Passenger’s Side Rear
Power Distribution Box)
L REARLRPDB (Driver’s Side Rear Power
Distribution Box)
L REARLRPDB (Driver’s Side Rear Power
Distribution Box)
HI FAN High Cooling Fan Motor
LOW FAN Low Cooling Fan Motor
BLOWER PWM Fan Motor Assembly
STARTER Starter Solenoid
EBCM Electronic Brake Control Module
Fuses Usage
RT PARKPassenger’s Side Taillamp
Assembly, Front Sidemarker and
Front Parking Lamp Assembly
HORN Dual Horn Assembly
LT HI BEAM Driver’s Side High-Beam Headlamp
LT LOW BEAM Driver’s Side Low-Beam Headlamp
RT LOW BEAMPassenger’s Side Low-Beam
Headlamp
RT HI BEAMPassenger’s Side High-Beam
Headlamp
HFV6 ECMHigh Feature V6 ECM
(Electronic Control Module)
REAR WPR Rear Wiper Motor
THEFTECM, TCM (Transmission Control
Module), PASS-Key
®III+ Module
LT PARKDriver’s Side Taillamp Assembly,
Front Sidemarker and Front Parking
Lamp Assembly
LIC/DIMMINGRear License Plate Assembly, DIM
(Dash Integration Module)
DIM/ALDLDIM, ALDL (Assembly Line
Data Link)
5-105
Page 414 of 468

Fuses Usage
FLASHER Turn Signal/Hazard Flasher Module
V8 ECM V8 ECM, Canister Purge
STRG CTLSSteering Wheel Control Pad,
Headlamp Switch
STARTER RLY Jumper to Starter Relay
WASH NOZDriver’s and Passenger’s Side
Heated Washer Nozzles
ODD COILSOdd Ignition Coils, Fuel Injectors,
Odd Injection Coils
TCM/IPCTCM, ECM and IPC
(Instrument Panel Cluster)
SPARE Not Used
ABS Anti-Lock Brake System
VICSVehicle Information and
Communication System
SPARE Not Used
SPARE Not Used
IGN SWIgnition Switch (Power to IGN-3
and CRANK)
VOLT CHECK DIM
ECM/TCMECM, TCM, IPC,
PASS-Key
®III+ Module
Fuses Usage
WPR MOD Windshield Wiper Module Assembly
POSTO2 Post O2 Sensors
COMP CLUTCH Compressor Clutch
WPR SW Windshield Wiper/Washer Switch
FOG LAMP Fog Lamps
OUTLETCenter Console Accessory Power
Outlet
EVEN COILS Even Injection Coils
I/P OUTLETInstrument Panel Accessory Power
Outlet
CCP Climate Control
PREO2/CAMDriver’s and Passenger’s Side
Oxygen Sensors, CAM Phaser
SPARE Not Used
SPARE Not Used
SPARE Not Used
Circuit
BreakersUsage
HDLP WASH
C/B-OPTHeadlamp Washer Motor (Optional)
5-106
Page 416 of 468
Fuses Usage
L FRT HTD
SEAT MODDriver’s Heated Seat Module
MEM/ADAPT
SEATDriver’s Power Seat Switch, Memory
Seat Module
THEFTUniversal Garage Door Opener,
Intrusion Sensor, Diversity Antenna
Module
REVERSE
LAMPISRVM (Inside Rearview Mirror),
License Plate Lamp Assembly
SPARE Not Used
POSITION
LAMPTaillamp Assemblies, Front Position
Lamp Assemblies
SPARE Not Used
ELC COMP ELC Compressor, ELC Solenoid
AUDIO Radio, OnStar Module
FFS SW Flip Fold Seat Switch
REAR DR MOD Rear Door Modules
FFSM Flip Fold Seat Module
DRIVER
DR MODDriver’s Door ModuleFuses Usage
BASSTaillamps, Center High-Mounted
Stop Lamp, Flasher Module, ABS
Module, Trailer Lamps
HDLP
LEVELINGHeadlamp Leveling System Chassis
Sensors (Export Only)
SPARE Not Used
CCP CCP (Climate Control Panel)
IGN 3Heated Seat Modules, Air Inlet
Motor, Shifter Assembly
J Cases Usage
AMP Audio Ampli er
ELC ELC Compressor
Circuit
BreakersUsage
SEAT C/BPower Seat Switches, Memory Seat
Module
5-108
Page 452 of 468

Audio System(s).............................................3-93
Audio Steering Wheel Controls....................3-124
Care of Your CD and DVD Player................3-126
Care of Your CDs and DVDs.......................3-126
Diversity Antenna System............................3-126
Navigation/Radio System.............................3-110
Radio with CD............................................3-94
Setting the Time..........................................3-93
Theft-Deterrent Feature...............................3-123
Understanding Radio Reception...................3-125
XM™ Satellite Radio Antenna System...........3-127
Automatic Transmission
Fluid..........................................................5-24
Operation...................................................2-25
B
Backing Up....................................................4-56
Battery..........................................................5-43
Battery Replacement......................................... 2-7
Battery Saver Active........................................3-64
Battery Voltage High.......................................3-64
Battery Voltage Low........................................3-65
Before Leaving on a Long Trip.........................4-37
Before You Drive...........................................3-110
Before You Go Off-Roading..............................4-17Brake
Panic Assist................................................4-11
Parking......................................................2-29
System Warning Light..................................3-41
Brake Adjustment............................................5-43
Brake Fluid....................................................5-40
Brake Pedal, Throttle.......................................2-23
Brake Pedal Travel.........................................5-43
Brake Wear...................................................5-42
Brakes..........................................................5-40
Braking........................................................... 4-6
Braking in Emergencies..................................... 4-9
Break-In, New Vehicle.....................................2-20
Bulb Replacement...........................................5-54
Back-Up and License Plate Lamps.................5-57
Center High-Mounted Stoplamp (CHMSL)........5-57
Front Turn Signal and Fog Lamps..................5-56
Halogen Bulbs............................................5-54
Headlamps, Sidemarker, and Parking Lamps.....5-55
High Intensity Discharge (HID) Lighting...........5-54
Replacement Bulbs......................................5-58
Sidemarker Lamps.......................................5-57
Taillamps, Turn Signal, Stoplamps and
Sidemarker Lamps...................................5-57
Buying New Tires...........................................5-72
2