GM Service Manual Online
For 1990-2009 cars only

The wiring circuits in your vehicle are protected from short circuits by a combination of fuses, circuit breakers and fusible thermal links. This greatly reduces the chance of fires caused by electrical problems.

Look at the silver-colored band inside the fuse. If the band is broken or melted, replace the fuse. Be sure you replace a bad fuse with a new one of the identical size and rating.

If you ever have a problem on the road and don't have a spare fuse, you can borrow one that has the same amperage. Just pick some feature of your vehicle that you can get along without - like the radio or cigarette lighter - and use its fuse, if it is the correct amperage. Replace it as soon as you can.

Instrument Panel Fuse Block


Object Number: 807404  Size: A3

The fuse block access door is on the driver's side edge of the instrument panel. Pull off the cover to access the fuse block.

To remove fuses if you don't have a fuse extractor, hold the end of the fuse between your thumb and index finger and pull straight out.

You may have spare fuses located behind the fuse block access door. These can be used to replace a bad fuse. However, make sure it is of the correct amperage.


Object Number: 869179  Size: B4

Fuses

Usage

RR Wiper

Rear Window Wiper Switch

SEO ACCY

Special Equipment Option Accessory

WS WPR

Windshield Wipers

TBC ACCY

Truck Body Controller Accessory

IGN 3

Ignition, Heated Seats

4WD

Four-Wheel Drive System

HTR A/C

Climate Control System

LOCK

Power Door Lock Relay (Lock Function)

HVAC 1

Inside Rearview Mirror, Climate Control System

L DOOR

Driver's Door Harness Connection

CRUISE

Cruise Control

UNLOCK

Power Door Lock Relay (Unlock Function)

RR FOG LP

Rear Fog Lamp (Export Only)

BRAKE

Anti-Lock Brake System

DRIVER UNLOCK

Power Door Lock Relay (Driver's Door Unlock Function)

IGN 0

PCM, TCM

TBC IGN 0

Truck Body Controller

VEH CHMSL

Vehicle and Trailer High Mounted Stoplamp

LT TRLR ST/TRN

Left Turn Signal/Stop Trailer

LT TRN

Left Turn Signals and Sidemarkers

VEH STOP

Vehicle Stoplamps, Brake Module, Electronic Throttle Control Module

Body

Harness Connector

RT TRLR ST/TRN

Right Turn Signal/Stop Trailer

RT TRN

Right Turn Signals and Sidemarkers

DDM

Driver Door Module

AUX PWR 2

Rear Cargo Area Power Outlets

LOCKS

Power Door Lock System

ECC

Rear Electronic Climate Control, Liftgate

TBC 2C

Truck Body Controller

FLASH

Flasher Module

CB LT DOORS

Left Power Window Circuit Breaker

TBC 2B

Truck Body Controller

TBC 2A

Truck Body Controller

Center Instrument Panel Fuse Block

The center instrument panel utility block is located underneath the instrument panel, to the left of the steering column.


Object Number: 849614  Size: B2

Device

Usage

SEO

Special Equipment Option

TRAILER

Trailer Brake Wiring

UPFIT

Upfitter (Not Used)

SL RIDE

Ride Control Harness Connection

HDLR 2

Headliner Wiring Connector

BODY

Body Wiring Connector

DEFOG

Rear Defogger Relay

HDLNR 1

Headliner Wiring Connector 1

SPARE RELAY

Not Used

CB SEAT

Driver and Passenger Seat Module Circuit Breaker

CB RT DOOR

Right Power Window Circuit Breaker

SPARE

Not Used

INFO

Infotainment Harness Connection

Underhood Fuse Block


Object Number: 805146  Size: B3

The underhood fuse block in the engine compartment on the driver's side of the vehicle near the battery. Lift the cover for access to the fuse/relay block.

To remove fuses, hold the end of the fuse between your thumb and index finger and pull straight out.

See Engine Compartment Overview for more information on its location.


Object Number: 872399  Size: C2

*1 -- Gasoline Engine and Fuel Injection Rail #2.

*2 -- Gasoline Engine and Fuel Injection Rail #1.

*3 -- Gasoline Engine; Oxygen Sensors.

*4 -- Gasoline Engine; Oxygen Sensors.

*5 -- PCM Ignition

Fuses

Usage

GLOW PLUG

Not Used

CUST FEED

Accessory Power

STUD #1

Auxiliary Power

MBEC

Mid Bussed Electrical Center Power Feed, Front Seats, Right Doors

BLOWER

Front Climate Control Fan

LBEC

Left Bussed Electrical Center, Door Modules, Door Locks, Auxiliary Power Outlet--Rear Cargo Area and Instrument Panel

STUD 2

Accessory Power/Trailer Wiring Brake Feed

ABS

Anti-Lock Brakes

VSES/ECAS

Vehicle Stability

IGN A

Ignition Power

IGN B

Ignition Power

LBEC 1

Left Bussed Electrical Center, Left Doors, Truck Body Controller, Flasher Module

TRL PARK

Parking Lamps Trailer Wiring

RR PARK

Right Rear Parking and Sidemarker Lamps

LR PARK

Left Rear Parking and Sidemarker Lamps

PARK LP

Parking Lamps Relay

STARTER

Starter Relay

INTPARK

Interior Lamps

STOP LP

Stoplamps

TBC BATT

Truck Body Controller Battery Feed

SUNROOF

Sunroof

SEO B2

Off-Road Lamps

4WS

Vent Solenoid Canister/Quadrasteer Module Power

RR HVAC

Rear Climate Control

AUX PWR

Auxiliary Power Outlet -- Console

IGN 1

Ignition Relay

PCM 1

Powertrain Control Module

ETC/ECM

Electronic Throttle Control, Electronic Brake Controller

INJ 1

Ignition Coil, Fuel Injectors--Bank 1

INJ 2

Ignition Coil, Fuel Injectors--Bank 2

IGN E

Instrument Panel Cluster, Air Conditioning Relay, Turn Signal/Hazard Switch, Starter Relay

RTD

Ride Control

TRL B/U

Backup Lamps Trailer Wiring

PCM B

Powertrain Control Module, Fuel Pump

F/PMP

Fuel Pump (Relay)

O2A

Oxygen Sensors

B/U LP

Back-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

SIR

Supplemental Inflatable Restraint System

FRT PARK

Front Parking Lamps, Sidemarker Lamps

DRL

Daytime Running Lamps (Relay)

SEO IGN

Rear Defog Relay

TBC IGN1

Truck Body Controller Ignition

HI HDLP-LT

High Beam Headlamp-Left

LH HID

Left Hand High Intensity Discharge Lamps

DRL

Daytime Running Lamps

IPC/DIC

Instrument Panel Cluster/Driver Information Center

HVAC/ECAS

Climate Control Controller

CIG LTR

Cigarette Lighter

HI HDLP-RT

High Beam Headlamp-Right

HDLP-LOW

Headlamp Low Beam Relay

A/C COMP

Air Conditioning Compressor Relay

A/C COMP

Air Conditioning Compressor

RR WPR

Rear Wiper/Washer

RADIO

Audio System

SEO B1

Mid Bussed Electrical Center, HomeLink, Rear Heated Seats

LO HDLP-LT

Headlamp Low Beam-Left

BTSI

Brake Transmission Shift Interlock System

CRANK

Starting System

LO HDLP-RT

Headlamp Low Beam-Right

FOG LP

Fog Lamp Relay

FOG LP

Fog Lamps

HORN

Horn Relay

W/S WASH

Windshield and Rear Window Washer Pump Relay

W/S WASH

Windshield and Rear Window Washer Pump

INFO

OnStar/Rear Seat Entertainment

RADIO AMP

Radio Amplifier

RH HID

Right Hand High Intensity Discharge Lamp

HORN

Horn Fuse

EAP

Electric Adjustable Pedals

TREC

All-Wheel Drive Module

SBA

Supplemental Brake Assist