wiring GMC SIERRA DENALI 2004 Owners Manual

Air Bag Readiness Light
There is an air bag readiness light on the instrument
panel cluster, which shows the air bag symbol.
The system checks the air bag's electrical system for
malfunctions. The light tells you if there is an electrical
problem. The system check includes the air bag
sensors, the air bag modules, the passenger sensing
system (if equipped), the wiring and the crash sensing
and diagnostic module. For more information on the
air bag system, see
Air Bag Systems on page 1-62.
This light will come on
when you start your
vehicle, and it will ¯ash for
a few seconds. Then
the light should go out.
This means the system
is ready.
If the air bag readiness light stays on after you start the
vehicle or comes on when you are driving, your air
bag system may not work properly. Have your vehicle
serviced right away.
Air Bag Off Light
When you turn the right front passenger's air bag off,
this light will be lit and stay lit to remind you that the air
bag has been turned off. This light will go off when
you turn the air bag back on again. See
Air Bag
Off Switch on page 1-68for more on this, including
important safety information.The AIR BAG OFF light will
look like one of the following illustrations.
United States with Passenger Sensing System
3-30

Trailer Wiring Harness
Your pickup is equipped with the eight-wire trailer
towing harness. This harness with a seven-pin universal
heavy-duty trailer connector is attached to a bracket
on the hitch platform.
The Center High-Mounted Stoplamp (CHMSL) wire is
tied next to the trailer wiring harness for use with a
trailer, slide-in camper or cap.The eight-wire harness contains the following trailer
circuits:
·Yellow: Left Stop/Turn Signal
·Dark Green: Right Stop/Turn Signal
·Brown: Taillamps
·White: Ground
·Light Green: Back-up Lamps
·Light Blue: Center High-Mounted
Stoplamp (CHMSL)
·Red: Battery Feed
·Dark Blue: Trailer Brake
If your trailer is equipped with electrical brakes, you can
get a jumper harness/electric trailer brake control
with a trailer battery feed fuse from your dealer. This
harness and fuse should be installed by your dealer or a
quali®ed service center.
If you need to tow a light-duty trailer with a standard
four-way round pin connector, you can also get an
adapter from your dealer.
4-69

Instrument Panel Jumper Wiring Harness
{CAUTION:
Be sure to use only the correct trailer brake
harness, the one intended for use on your
vehicle. If you use some other trailer brake
harness, even if it seems to ®t, your trailer
brakes may not work at all. You could have a
crash in which you or others could be injured.
Use only the trailer brake harness intended for
your vehicle. If it is no longer available to you,
be sure to get a proper replacement from your
dealer.This harness is included with your vehicle as part of the
heavy-duty trailer wiring package.
This harness is for an electric brake controller and
includes a trailer battery feed fuse. It should be installed
by your dealer or a quali®ed service center.
4-70

Four-Wire Harness Adapter
This adapter is included
with your vehicle as part of
the heavy-duty trailer
wiring package.
Use this adapter to connect a standard four-way round
pin connector to the seven-wire harness on your
vehicle.Connect the adapter with the tab pointing up
(see arrow). The ¯ip cap on the vehicle's seven-wire
harness will lock onto the tab and help hold the adapter
in place. Plug the four-way round pin connector onto
the adapter.
4-71

Electrical System
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.
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.
5-105

Center 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
CB SEATDriver and Passenger Seat
Module Circuit Breaker
CB RT DOORRight Power Windows Circuit
Breaker
SPARE Not Used
INFOInfotainment Harness
Connection
5-108

*1Ð Gasoline Engine and Diesel Engine.
*2Ð Gasoline Engine; ECMRPV Ð Diesel Engine.
*3Ð Gasoline Engine; FUEL HT Ð Diesel Engine.
*4Ð Gasoline Engine; ECM I Ð Diesel Engine.
*5Ð IGN/EDU
Fuses Usage
GLOW PLUGDiesel Glow Plugs and Intake
Air Heater
CUST FEED Gasoline Accessory Power
STUD #1Auxiliary Power (Single
Battery and Diesels Only)/
Dual Battery (TP2) Do not
install fuse.
MBECMid Bussed Electrical Center
Power Feed, Front Seats,
Right Doors
BLOWER Front Climate Control Fan
LBECLeft Bussed Electrical
Center, Door Modules,
Door Locks, Auxiliary Power
Outlet Ð Rear Cargo Area
and Instrument Panel
Fuses Usage
STUD 2Accessory Power/Trailer
Wiring Brake Feed
ABS Anti-Lock Brakes
VSES/ECAS Vehicle Stability
IGN A Ignition Power
IGN B Ignition Power
LBEC 1Left Bussed Electrical Center,
Left Doors, Truck Body
Controller, Flasher Module
TRL PARK Parking Lamps Trailer Wiring
RR PARKRight Rear Parking and
Sidemarker Lamps
LR PARKLeft Rear Parking and
Sidemarker Lamps
PARK LP Parking Lamps Relay
STARTER Starter Relay
INTPARK Interior Lamps
STOP LP Stoplamps
5-111

Fuses Usage
TBC BATTTruck Body Controller
Battery Feed
SUNROOF Sunroof
SEO B2 Off-Road Lamps
4WSVent Solenoid
Canister/Quadrasteer
Module Power
RR HVAC Not Used
AUX PWRAuxiliary Power
Outlet Ð Console
IGN 1 Ignition Relay
PCM 1 Powertrain Control Module
ETC/ECMElectronic Throttle Control,
Electronic Brake Controller
IGN EInstrument Panel Cluster,
Air Conditioning Relay,
Turn Signal/Hazard Switch,
Starter Relay
RTD Ride Control
TRL B/U Backup Lamps Trailer WiringFuses Usage
PCM BPowertrain Control Module,
Fuel Pump
F/PMP Fuel Pump (Relay)
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
02B Oxygen Sensors
SIRSupplemental 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
5-112

Theft-Deterrent Systems...................................2-15
Content Theft-Deterrent................................2-16
Passlock
ž...................................................2-17
TIGHTEN FUEL CAP......................................3-62
Tilt Wheel........................................................ 3-5
Tire Sidewall Labeling......................................5-60
Tire Size.......................................................5-63
Tire Terminology and De®nitions........................5-64
Tires.............................................................5-59
Buying New Tires........................................5-70
Chains.......................................................5-74
Changing a Flat Tire....................................5-76
If a Tire Goes Flat.......................................5-75
In¯ation - Tire Pressure................................5-67
Inspection and Rotation................................5-68
Spare Tire..................................................5-95
Uniform Tire Quality Grading.........................5-71
Wheel Alignment and Tire Balance.................5-72
Wheel Replacement.....................................5-73
When It Is Time for New Tires......................5-69
To Use the Engine Coolant Heater....................2-21
Tonneau Cover...............................................2-43
Top Strap......................................................1-40
Top Strap Anchor Location...............................1-42
Torque Lock...................................................2-28
Total Weight on Your Vehicle's Tires..................4-63
Tow/Haul Mode...............................................2-24
Tow/Haul Mode Light.......................................3-44Towing
Recreational Vehicle.....................................4-48
Towing a Trailer..........................................4-58
Your Vehicle...............................................4-48
Traction
Manual Selectable Ride................................. 4-9
TRACTION ACTIVE........................................3-63
Trailer
Recommendations.......................................4-57
Trailer Brakes.................................................4-64
Trailer Wiring Harness.....................................4-69
Transfer Case................................................5-46
Transmission
Fluid, Automatic...........................................5-18
Temperature Gage.......................................3-39
TRANSMISSION HOT.....................................3-63
Transmission Operation, Automatic....................2-22
Transmission, Transaxle, Transfer Case Unit
Repair Manual............................................7-11
Transportation Options...................................... 7-8
Traveling to Remote Areas...............................4-20
Trip Information Button....................................3-47
Trip Odometer................................................3-29
Truck-Camper Loading Information....................4-55
Turn and Lane Change Signals.......................... 3-6
TURN SIGNAL ON.........................................3-63
Turn Signal/Multifunction Lever........................... 3-5
Turn Signals When Towing a Trailer..................4-66
Two-Tiered Loading.........................................4-54
14