Page 400 of 456
Relays Usage
PARK LAMP
RELAY MICROParking Lamps
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/Engine Control
Module (ECM)
STARTER
RELAY MINIStarter SolenoidRelays Usage
CMP CLU
RELAY MICROCompressor Clutch
IGN-1 RELAY
MICROIgnition Switch (ON)
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)
5-96
Page 401 of 456

J Cases Usage
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
Fuses Usage
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)
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
5-97
Page 402 of 456
Fuses Usage
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
WPR MOD Windshield Wiper Module Assembly
POSTO2 Post O2 Sensors
COMP CLUTCH Compressor Clutch
WPR SW Windshield Wiper/Washer Switch
Fuses Usage
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)
5-98
Page 405 of 456
Rear Underseat Fuse Block
(Passenger Side)
The passenger’s side rear fuse block is located under
the rear seat on the passenger’s side of the vehicle. The
carpet must be lifted up to access the rear fuse block.
To access the fuse block, push in the two tabs located at
each end of the fuse block cover. Then lift the cover off.
Relays Usage
PRIMARY
QUARTER A/C
RELAY MINIRear Air Conditioning
SPARE Not Used
REAR DEFOG
RELAY MINIRear Window Defogger
SPARE Not Used
AFTERBOIL
RELAY MICROAfterboil Pump
INT LAMP
RELAY MICROHush Panel Lamps, Puddle Lamps,
Overhead Courtesy Lamp Assembly
IGN 1 RELAY
MICROIgnition Switch
SPARE Not Used
RAP RELAY
(MICRO)Sunroof
FUEL PUMP
MOTOR
RLY MICROFuel Pump Motor
5-101
Page 406 of 456
Fuses Usage
INTERIOR
LAMPHush Panel Lamps, Puddle Lamps,
Overhead Courtesy Lamp Assembly
RT FRT
DR MODPassenger’s Door Module
RIMRear Integration Module (RIM),
Ignition Switch, Key Lock Cylinder
REAR FOG
LAMPRear Fog Lamps (Export Only)
SUSPNTN Suspension Module
VICS/RAPTV Tuner Assembly, Vehicle
Information Communication System
(VICS) Module, Sunroof
SPARE Not Used
POWER
SOUNDERPower Sounder, Inclination Sensor
AFTERBOIL Afterboil Heater Pump
CANISTER
VENTCanister Vent Solenoid
FUEL
PUMP MTRFuel Pump Motor
REAR HVAC Rear Climate Control System
R FRT HTD
SEAT MODPassenger’s Side Heated Seat
ModuleFuses Usage
REAR HATCH Rear Hatch Latch
AIR BAG Sensing Diagnostic Module (SDM)
REAR DEFOG Rear Window Defogger Element
IGN 1Shifter, Power Sounder, Rear
Parking Aid, Rearview Mirror, RIM
SPARE Not Used
SPARE Not Used
J Cases Usage
SUNROOF
MODPower Sunroof Module
POWER
LIFTGATEPower Liftgate
Circuit
BreakersUsage
DR MOD
PWR C/BDoor Modules
5-102
Page 418 of 456

At Least Once a Year
Starter Switch Check
{CAUTION:
When you are doing this inspection, the
vehicle could move suddenly. If the vehicle
moves, you or others could be injured.
1. Before you start, be sure you have enough room
around the vehicle.
2. Firmly apply both the parking brake and the regular
brake. SeeParking Brake on page 2-31.
Do not use the accelerator pedal, and be ready to
turn off the engine immediately if it starts.
3. Try to start the engine in each gear. The vehicle
should start only in PARK (P) or NEUTRAL (N). If
the vehicle starts in any other position, contact your
GM Goodwrench
®dealer for service.
Automatic Transmission Shift Lock
Control System Check
{CAUTION:
When you are doing this inspection, the
vehicle could move suddenly. If the vehicle
moves, you or others could be injured.
1. Before you start, be sure you have enough room
around the vehicle. It should be parked on a level
surface.
2. Firmly apply the parking brake. SeeParking Brake
on page 2-31.
Be ready to apply the regular brake immediately if
the vehicle begins to move.
3. With the engine off, turn the ignition to ON, but do
not start the engine. Without applying the regular
brake, try to move the shift lever out of PARK (P)
with normal effort. If the shift lever moves out
of PARK (P), contact your GM Goodwrench
®dealer
for service.
6-10
Page 419 of 456

Ignition Transmission Lock Check
While parked, and with the parking brake set, try to turn
the ignition to OFF in each shift lever position.
The ignition should turn to OFF only when the shift
lever is in PARK (P).
The key should come out only in OFF.
Contact your GM Goodwrench
®dealer if service is
required.
Parking Brake and Automatic
Transmission Park (P) Mechanism Check
{CAUTION:
When you are doing this check, your vehicle
could begin to move. You or others could be
injured and property could be damaged. Make
sure there is room in front of your vehicle in
case it begins to roll. Be ready to apply the
regular brake at once should the vehicle begin
to move.Park on a fairly steep hill, with the vehicle facing
downhill. Keeping your foot on the regular brake, set the
parking brake.
To check the parking brake’s holding ability: With
the engine running and transmission in
NEUTRAL (N), slowly remove foot pressure from
the regular brake pedal. Do this until the vehicle is
held by the parking brake only.
To check the PARK (P) mechanism’s holding ability:
With the engine running, shift to PARK (P). Then
release the parking brake followed by the regular
brake.
Contact your GM Goodwrench
®dealer if service is
required.
Underbody Flushing Service
At least every spring, use plain water to ush any
corrosive materials from the underbody. Take care to
clean thoroughly any areas where mud and other debris
can collect.
6-11
Page 449 of 456

I
Ignition Positions.............................................2-23
Immobilizer....................................................2-20
Immobilizer Operation......................................2-20
Infants and Young Children, Restraints...............1-33
In ation - Tire Pressure...................................5-59
Instrument Panel
Overview..................................................... 3-4
Instrument Panel (I/P)
Brightness..................................................3-20
Cluster.......................................................3-35
J
Jump Starting.................................................5-40
K
Keyless Entry System....................................... 2-4
Keys............................................................... 2-3
L
Labeling, Tire Sidewall.....................................5-54
Lamps
Exterior Lighting Battery Saver......................3-20
Fog ...........................................................3-19
Reading.....................................................3-21
LATCH System
Child Restraints...........................................1-40
Level Control..................................................4-51
Liftgate, Power...............................................2-12
Light
Airbag Readiness........................................3-38
Anti-Lock Brake System Warning...................3-40
Brake System Warning.................................3-39
Charging System.........................................3-39
Cruise Control.............................................3-48
Engine Coolant Temperature Warning.............3-42
Fog Lamp ..................................................3-47
Highbeam On.............................................3-48
Lights On Reminder.....................................3-48
Malfunction Indicator....................................3-43
Oil Pressure...............................................3-46
Safety Belt Reminder...................................3-37
Security.....................................................3-47
7