fuse CHEVROLET SILVERADO 2003 1.G User Guide

Auxiliary Battery
The auxiliary battery provision can be used to supply
electrical power to additional equipment that you
may choose to add, such as a slide-in camper.
If your vehicle has this
provision, this relay will be
located on the passenger's
side of the vehicle, next
to the auxiliary battery.When using this provision, connection should only be
made to the upper stud (A) of the relay. Do not
make connections to the lower stud (B) of the relay.
The auxiliary battery circuit is protected by a megafuse
located behind the auxiliary battery.
Be sure to follow the proper installation instructions that
are included with any electrical equipment that you
install.
Notice:When using the auxiliary battery provision,
the electrical load must not exceed 30 amps.
Always turn off any electrical equipment when not
in use. Leaving electrical equipment on for extended
periods will drain your battery.
Power Winches
If you wish to use a power winch on your vehicle, only
use it when your vehicle is stationary or anchored.
4-94

Bulb Replacement..........................................5-59
Halogen Bulbs..............................................5-59
Headlamps..................................................5-59
Front Turn Signal, Sidemarker and Daytime
Running Lamps.........................................5-61
Roof Marker Lamps......................................5-62
Center High-Mounted Stoplamp (CHMSL) and
Cargo Lamp.............................................5-63
Pickup Box Identi®cation and Fender Marker
Lamps.....................................................5-65
Taillamps.....................................................5-65
Replacement Bulbs.......................................5-67
Windshield Wiper Blade Replacement..............5-68
Tires..............................................................5-69
In¯ation -- Tire Pressure................................5-69
Dual Tire Operation.......................................5-70
Tire Inspection and Rotation...........................5-71
When It Is Time for New Tires.......................5-73
Buying New Tires.........................................5-74
Uniform Tire Quality Grading..........................5-75
Wheel Alignment and Tire Balance..................5-76
Wheel Replacement......................................5-76
Tire Chains..................................................5-78
If a Tire Goes Flat........................................5-79
Changing a Flat Tire.....................................5-80Appearance Care..........................................5-100
Cleaning the Inside of Your Vehicle...............5-100
Care of Safety Belts....................................5-103
Weatherstrips.............................................5-103
Cleaning the Outside of Your Vehicle.............5-103
Sheet Metal Damage...................................5-105
Finish Damage...........................................5-106
Underbody Maintenance...............................5-106
Chemical Paint Spotting...............................5-106
Vehicle Care/Appearance Materials................5-107
Vehicle Identi®cation.....................................5-108
Vehicle Identi®cation Number (VIN)................5-108
Service Parts Identi®cation Label...................5-109
Electrical System..........................................5-109
Add-On Electrical Equipment.........................5-109
Windshield Wiper Fuses...............................5-109
Power Windows and Other Power Options......5-109
Fuses and Circuit Breakers..........................5-110
Capacities and Speci®cations........................5-118
Capacities and Speci®cations........................5-118
Normal Maintenance Replacement Parts.........5-121
Section 5 Service and Appearance Care
5-2

CAUTION: (Continued)
·
Be sure to use the proper nuts, bolts and
other fasteners. ªEnglishº and ªmetricº
fasteners can be easily confused. If you
use the wrong fasteners, parts can later
break or fall off. You could be hurt.
Adding Equipment to the Outside of
Your Vehicle
Things you might add to the outside of your vehicle can
affect the air¯ow around it. This may cause wind
noise and affect windshield washer performance. Check
with your dealer before adding equipment to the
outside of your vehicle.
Fuel
If your vehicle has a diesel engine, see ªDiesel Fuel
Requirements and Fuel Systemº in the Diesel Engine
Supplement.
For vehicles with gasoline engines, please read this.
Gasoline Octane
For all except the Silverado SS model, use regular
unleaded gasoline with a posted octane of 87 or higher.
If the octane is less than 87, you may get a heavy
knocking noise when you drive. If this occurs, use a
gasoline rated at 87 octane or higher as soon as
possible. Otherwise, you might damage your engine. A
little pinging noise when you accelerate or drive
uphill is considered normal. This does not indicate a
problem exists or that a higher-octane fuel is necessary.
If you are using 87 octane or higher-octane fuel and
hear heavy knocking, your engine needs service.
If you have the Silverado SS model, use premium
unleaded gasoline with a posted octane of 91 or higher
for best performance. You may also use middle
grade or regular unleaded gasoline rated at 87 octane
or higher, but your vehicle's acceleration may be slightly
reduced. If the octane is less than 87, you may get a
heavy knocking noise when you drive. If this occurs, use
gasoline rated at 87 octane or higher as soon as
possible. Otherwise, you might damage your engine.
5-4

A. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 5-21.
B. Coolant Surge Tank. See
Engine Coolant on
page 5-30.
C. Air Filter Restriction Indicator (If Equipped). See
Engine Air Cleaner/Filter on page 5-21.
D. Engine Oil Dipstick. See
Engine Oil on page 5-16.
E. Automatic Transmission Dipstick (If equipped).
See
Automatic Transmission Fluid (Except Allison
Transmissionž) on page 5-23orAutomatic
Transmission Fluid (Allison Transmissionž)on
page 5-26.
F. Fan. See
Cooling System on page 5-36.
G. Engine Oil Fill. See
Engine Oil on page 5-16.H. Power Steering Fluid Reservoir. See
Power Steering
Fluid on page 5-42.
I. Remote Negative (-) Terminal (GND). See
Jump
Starting on page 5-48.
J. Remote Positive (+) Terminal. See
Jump Starting on
page 5-48.
K. Brake Fluid Reservoir. See
Brakes on page 5-44.
L. Clutch Fluid Reservoir (If Equipped). See
Hydraulic
Clutch on page 5-29.
M. Underhood Fuse Block. See
Fuses and Circuit
Breakers on page 5-110.
N. Battery. See
Battery on page 5-47.
O. Windshield Washer Fluid Reservoir. See
Windshield
Washer Fluid on page 5-43.
5-11

A. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 5-21.
B. Coolant Surge Tank. See
Engine Coolant on
page 5-30.
C. Air Filter Restriction Indicator (If Equipped). See
Engine Air Cleaner/Filter on page 5-21.
D. Engine Oil Dipstick. See
Engine Oil on page 5-16.
E. Automatic Transmission Dipstick (If Equipped).
See
Automatic Transmission Fluid (Except Allison
Transmissionž) on page 5-23orAutomatic
Transmission Fluid (Allison Transmissionž)on
page 5-26.
F. Engine Oil Fill. See
Engine Oil on page 5-16.
G. Fan. See
Cooling System on page 5-36.H. Remote Negative (-) Terminal (GND). See
Jump
Starting on page 5-48.
I. Power Steering Fluid Reservoir. See
Power Steering
Fluid on page 5-42.
J. Remote Positive (+) Terminal. See
Jump Starting on
page 5-48.
K. Brake Fluid Reservoir. See
Brakes on page 5-44.
L. Clutch Fluid Reservoir (If Equipped). See
Hydraulic
Clutch on page 5-29.
M. Underhood Fuse Block. See
Fuses and Circuit
Breakers on page 5-110.
N. Battery. See
Battery on page 5-47.
O. Windshield Washer Fluid Reservoir. See
Windshield
Washer Fluid on page 5-43.
5-13

A. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 5-21.
B. Coolant Surge Tank. See
Engine Coolant on
page 5-30.
C. Air Filter Restriction Indicator (If Equipped). See
Engine Air Cleaner/Filter on page 5-21.
D. Engine Oil Dipstick. See
Engine Oil on page 5-16.
E. Automatic Transmission Dipstick (If Equipped).
See
Automatic Transmission Fluid (Except Allison
Transmissionž) on page 5-23orAutomatic
Transmission Fluid (Allison Transmissionž)on
page 5-26.
F. Engine Oil Fill. See
Engine Oil on page 5-16.
G. Fan. See
Cooling System on page 5-36.H. Remote Negative (-) Terminal (GND). See
Jump
Starting on page 5-48.
I. Remote Positive (+) Terminal. See
Jump Starting on
page 5-48.
J. Power Steering Fluid Reservoir. See
Power Steering
Fluid on page 5-42.
K. Brake Fluid Reservoir. See
Brakes on page 5-44.
L. Clutch Fluid Reservoir (If Equipped). See
Hydraulic
Clutch on page 5-29.
M. Underhood Fuse Block. See
Fuses and Circuit
Breakers on page 5-110.
N. Battery. See
Battery on page 5-47.
O. Windshield Washer Fluid Reservoir. See
Windshield
Washer Fluid on page 5-43.
5-15

Service Parts Identi®cation Label
You'll ®nd this label located in the glove box. It's very
helpful if you ever need to order parts. On this label is:
·your VIN,
·the model designation,
·paint information and
·a list of all production options and special
equipment.
Be sure that this label is not removed from the vehicle.
Electrical System
Add-On Electrical Equipment
Notice:Don't add anything electrical to your
vehicle unless you check with your dealer ®rst.
Some electrical equipment can damage your vehicle
and the damage wouldn't be covered by your
warranty. Some add-on electrical equipment can
keep other components from working as they
should.Your vehicle has an air bag system. Before attempting
to add anything electrical to your vehicle, see
Servicing Your Air Bag-Equipped Vehicle on page 1-80.
Windshield Wiper Fuses
The windshield wiper motor is protected by an internal
circuit breaker and a fuse. If the motor overheats due to
heavy snow, etc., the wiper will stop until the motor
cools. If the overload is caused by some electrical
problem and not snow, etc., be sure to get it ®xed.
Power Windows and Other Power
Options
Circuit breakers protect the power windows and other
power accessories. When the current load is too heavy,
the circuit breaker opens and closes, protecting the
circuit until the problem is ®xed or goes away.
5-109

Fuses and Circuit Breakers
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 ®res 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
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, hold the end of the fuse between your
thumb and index ®nger 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.
5-110

Fuses Usage
RR Wiper Not Used
SEO ACCYSpecial Equipment Option
Accessory
WS WPR Windshield Wipers
TBC ACCYTruck Body Controller
Accessory
IGN 3 Ignition, Heated Seats
4WDFour-Wheel Drive System,
Auxiliary Battery
Fuses Usage
HTR A/C Climate Control System
LOCK (Relay)Power Door Lock Relay
(Lock Function)
HVAC 1 Climate Control System
L DOORDriver's Door Harness
Connection
CRUISECruise Control, Power Take
Off (PTO)
UNLOCK (Relay)Power Door Lock Relay
(Unlock Function)
RR FOG LP Not Used
BRAKE Anti-Lock Brake System
DRIVER UNLOCKPower Door Lock Relay
(Driver's Door Unlock
Function)
IGN 0 TCM
TBC IGN 0 Truck Body Controller
VEH CHMSLVehicle and Trailer High
Mounted Stoplamp
LT TRLR ST/TRN Left Turn Signal/Stop Trailer
LT TRNLeft Turn Signals and
Sidemarkers
VEH STOPVehicle Stoplamps, Brake
Module, Electronic Throttle
Control Module
RT TRLR ST/TRN Right Turn Signal/Stop Trailer
5-111

Fuses Usage
RT TRNRight Turn Signals and
Sidemarkers
BODY Harness Connector
DDM Driver Door Module
AUX PWR 2 Not Used
LOCKS Power Door Lock System
ECC Not Used
TBC 2C Truck Body Controller
FLASH Flasher Module
CB LT DOORSLeft Power Windows Circuit
Breaker
TBC 2B Truck Body Controller
TBC 2A Truck Body ControllerCenter Instrument Panel Fuse Block
The center instrument panel utility block is located
underneath the instrument panel, to the left of the
steering column.
Device Usage
SEO Special Equipment Option
TRAILER Trailer Brake Wiring
UPFIT Up®tter (Not Used)
SL RIDERide 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
5-112