2004 GMC YUKON trailer

Fuses Usage
4WDFour-Wheel Drive System,
Auxiliary Battery
HTR A/C Climate Control System
LOCKPower Door Lock Relay
(Lock Function)
HVAC 1Inside Rearview Mirror,
Climate Control System
L DOORDriver’s Door Harness
Connection
CRUISE Cruise Control
UNLOCKPower Door Lock Relay
(Unlock Function)
RR FOG LP Rear Fog Lamp (Export Only)
BRAKE Anti-Lock Brake System
DRIVER UNLOCKPower Door Lock Relay
(Driver’s Door Unlock
Function)
IGN 0 PCM, TCM
TBC IGN 0 Truck Body Controller
VEH CHMSLVehicle and Trailer High
Mounted Stoplamp
LT TRLR ST/TRN Left Turn Signal/Stop TrailerFuses Usage
LT TRNLeft Turn Signals and
Sidemarkers
VEH STOPVehicle Stoplamps, Brake
Module, Electronic Throttle
Control Module
RT TRLR ST/TRN Right Turn Signal/Stop Trailer
RT TRNRight Turn Signals and
Sidemarkers
BODY Harness Connector
DDM Driver Door Module
AUX PWR 2Rear Cargo Area Power
Outlets
LOCKS Power Door Lock System
ECCRear Electronic Climate
Control, Liftgate
TBC 2C Truck Body Controller
FLASH Flasher Module
CB LT DOORSLeft Power Window Circuit
Breaker
TBC 2B Truck Body Controller
TBC 2A Truck Body Controller
5-115

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 Uptter (Not Used)
Device Usage
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 Window Circuit
Breaker
SPARE Not Used
INFOInfotainment Harness
Connection
5-116

*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 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—Rear
Cargo Area and Instrument
Panel
STUD 2Accessory Power/Trailer
Wiring Brake Feed
Fuses Usage
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
TBC BATTTruck Body Controller Battery
Feed
SUNROOF Sunroof
SEO B2 Off-Road Lamps
5-119

Fuses Usage
4WSVent Solenoid
Canister/Quadrasteer Module
Power
RR HVAC Rear Climate Control
AUX PWRAuxiliary Power
Outlet — 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 Wiring
PCM BPowertrain Control Module,
Fuel Pump
F/PMP Fuel Pump (Relay)
B/U LPBack-up Lamps, Automatic
Transmission Shift Lock
Control SystemFuses Usage
RR DEFOG Rear Window Defogger
HDLP-HI Headlamp High Beam Relay
PRIME Not Used
SIRSupplemental Inatable
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
LH HID Not Used
DRL Daytime Running Lamps
IPC/DICInstrument Panel
Cluster/Driver Information
Center
HVAC/ECAS Climate Control Controller
CIG LTR Cigarette Lighter
HI HDLP-RT High Beam Headlamp-Right
5-120

(c)Visually inspect hoses and have them replaced if they
are cracked, swollen or deteriorated. Inspect all pipes,
ttings and clamps; replace with genuine GM parts as
needed. To help ensure proper operation, a pressure test
of the cooling system and pressure cap and cleaning the
outside of the radiator and air conditioning condenser is
recommended at least once a year.
(d)Visually inspect wiper blades for wear or cracking.
Replace blade inserts that appear worn or damaged
or that streak or miss areas of the windshield.
(e)Make sure the safety belt reminder light and all your
belts, buckles, latch plates, retractors and anchorages
are working properly. Look for any other loose or
damaged safety belt system parts. If you see anything
that might keep a safety belt system from doing its
job, have it repaired. Have any torn or frayed safety belts
replaced. Also look for any opened or broken air bag
coverings, and have them repaired or replaced. (The air
bag system does not need regular maintenance.)
(f)Lubricate all key lock cylinders, hood latch assembly,
secondary latch, pivots, spring anchor, release pawl, rear
compartment hinges, outer liftgate handle pivot points,
rear door detent link, roller mechanism, liftgate handle
pivot points, latch bolt, fuel door hinge, cargo door hinge,
locks and folding seat hardware. More frequent
lubrication may be required when exposed to a corrosive
environment. Applying silicone grease on weatherstrips
with a clean cloth will make them last longer, seal better
and not stick or squeak.(g)Add uid as needed. A uid loss could indicate a
problem; repair as needed. Check vent hose at transfer
case for kinks and proper installation.
(h)Change automatic transmission uid and lter if the
vehicle is mainly driven under one or more of these
conditions:
In heavy city traffic where the outside temperature
regularly reaches 90°F (32°C) or higher.
In hilly or mountainous terrain.
When doing frequent trailer towing.
Uses such as found in taxi, police or delivery
service.
(i)Drain, ush and rell cooling system. See Engine
Coolant on page 5-26for what to use. Inspect hoses.
Clean radiator, condenser, pressure cap and ller neck.
Pressure test the cooling system and pressure cap.
(j)A uid loss in any vehicle system could indicate a
problem. Have the system inspected and repaired and
the uid level checked. Add uid if needed.
(k)Inspect system. Check all fuel and vapor lines and
hoses for proper hook-up, routing and condition.
Check that the purge valve works properly (if equipped).
Replace as needed.
6-8

Customer Assistance Information (cont.)
Reporting Safety Defects to the United States
Government............................................7-11
Roadside Assistance Program......................... 7-6
Service Publications Ordering Information........7-12
D
Daytime Running Lamps..................................3-17
Defensive Driving............................................. 4-2
Defogging and Defrosting.........................3-25, 3-32
Delayed Locking.............................................2-10
Dinghy Towing................................................4-54
Doing Your Own Service Work........................... 5-3
Dolly Towing..................................................4-55
Dome Lamps.................................................3-20
Door
Delayed Locking..........................................2-10
Locks.......................................................... 2-8
Power Door Locks......................................... 2-9
Programmable Automatic Door Locks.............2-10
Rear Door Security Locks.............................2-12
Driver
Position, Safety Belt.....................................1-28
DRIVER DOOR AJAR.....................................3-71
Driver Information Center (DIC).........................3-58
DIC Operation and Displays..........................3-58
DIC Warnings and Messages........................3-70Driving
At Night.....................................................4-36
City...........................................................4-41
Defensive..................................................... 4-2
Drunken....................................................... 4-2
Freeway.....................................................4-42
Hill and Mountain Roads..............................4-44
In Rain and on Wet Roads...........................4-38
Off-Road....................................................4-22
Winter........................................................4-46
Driving Across an Incline..................................4-33
Driving Downhill..............................................4-31
Driving in Mud, Sand, Snow or Ice....................4-34
Driving in Water..............................................4-35
Driving On Grades..........................................4-73
Driving on Off-Road Hills.................................4-28
Driving on Snow or Ice....................................4-47
Driving Through Deep Standing Water...............4-40
Driving Through Flowing Water.........................4-40
Driving Uphill..................................................4-29
Driving with a Trailer.......................................4-71
Dual Automatic Climate Control System.............3-27
Dual Climate Control System............................3-23
DVD
Cleaning the Video Screen..........................3-139
Distortion..................................................3-137
Rear Seat Entertainment System..................3-122
DVD Player..................................................3-123
5

Headlamps....................................................5-55
Bulb Replacement.......................................5-55
Front Turn Signal, Sidemarker and Daytime
Running Lamps........................................5-56
Halogen Bulbs............................................5-55
Roof Marker Lamps.....................................5-58
Side Identication Marker Lamps...................5-57
Headphones.................................................3-129
Heated Seats................................................... 1-5
Heating.........................................................3-32
Highway Hypnosis...........................................4-44
Hill and Mountain Roads..................................4-44
Hitches..........................................................4-69
HomeLink
®Transmitter....................................2-55
HomeLink®Transmitter, Programming................2-56
Hood
Checking Things Under................................5-10
Release.....................................................5-11
Horn............................................................... 3-7
How to Add Coolant to the Coolant
Surge Tank.................................................5-34
How to Add Fluid............................................5-25
How to Check........................................5-23, 5-72
How to Check Lubricant...................................5-52
How to Check Power Steering Fluid..................5-39
How to Inspect...............................................5-21
How to Use This Manual...................................... ii
How to Wear Safety Belts Properly...................1-28
Hydroplaning..................................................4-40
I
If No Steam Is Coming From Your Engine..........5-31
If Steam Is Coming From Your Engine...............5-30
If the Light is Flashing.....................................3-53
If the Light Is On Steady.................................3-53
If You Are Caught in a Blizzard.........................4-48
If You Are Stuck in Sand, Mud, Ice or Snow.......4-50
If You Do Decide To Pull A Trailer.....................4-63
Ignition Positions.............................................2-21
Infants and Young Children, Restraints...............1-48
Ination - Tire Pressure...................................5-72
Instrument Panel
Cluster.......................................................3-41
Overview..................................................... 3-4
Instrument Panel Brightness.............................3-19
Instrument Panel Fuse Block..........................5-114
Interior Lamps................................................3-19
J
Jump Starting.................................................5-45
K
KEYFOB X BATTERY LOW.............................3-72
Keyless Entry System....................................... 2-4
Keys............................................................... 2-3
8

M
Maintenance Schedule
Additional Required Services........................... 6-6
At Each Fuel Fill........................................... 6-9
At Least Once a Month.................................. 6-9
At Least Once a Year..................................6-10
Introduction.................................................. 6-2
Maintenance Footnotes.................................. 6-7
Maintenance Record....................................6-16
Maintenance Requirements............................. 6-2
Normal Maintenance Replacement Parts.........6-14
Owner Checks and Services........................... 6-9
Recommended Fluids and Lubricants.............6-12
Scheduled Maintenance................................. 6-4
Using Your................................................... 6-3
Your Vehicle and the Environment................... 6-2
Maintenance When Trailer Towing.....................4-74
Making Turns.................................................4-72
Malfunction Indicator Light................................3-51
Manual Seats................................................... 1-3
Manual Windows............................................2-16
Matching Transmitter(s) to Your Vehicle............... 2-6
Memory Seat.................................................2-64
Message
DIC Warnings and Messages........................3-70Mexico, Central America and Caribbean Islands/
Countries (Except Puerto Rico and U.S. Virgin
Islands)....................................................... 7-5
Mirrors
Automatic Dimming Rearview with Compass
and Temperature Display...........................2-46
Automatic Dimming Rearview with OnStar
®,
Compass and Temperature Display.............2-44
Manual Rearview Mirror................................2-43
Outside Automatic Dimming Mirror.................2-51
Outside Camper-Type Mirrors........................2-49
Outside Convex Mirror.................................2-52
Outside Curb View Assist Mirrors...................2-52
Outside Heated Mirrors................................2-52
Outside Manual Mirrors................................2-49
Outside Power Camper-Type.........................2-50
Outside Power Foldaway Mirrors....................2-50
Outside Power Mirrors..................................2-50
Model Reference................................................ vi
MyGMLink.com................................................ 7-3
N
New Vehicle Break-In......................................2-20
Normal Maintenance Replacement Parts............6-14
10