2004 CHEVROLET TAHOE trailer

6. Then replace the
pressure cap.
Be sure the pressure
cap is hand-tight
and fully seated.Engine Fan Noise
Your vehicle has a clutched engine cooling fan. When
the clutch is engaged, the fan spins faster to provide
more air to cool the engine. In most everyday driving
conditions, the fan is spinning slower and the clutch is
not fully engaged. This improves fuel economy and
reduces fan noise. Under heavy vehicle loading, trailer
towing and/or high outside temperatures, the fan
speed increases as the clutch more fully engages.
So you may hear an increase in fan noise. This
is normal and should not be mistaken as the
transmission slipping or making extra shifts. It is
merely the cooling system functioning properly.
The fan will slow down when additional cooling is
not required and the clutch disengages.
You may also hear this fan noise when you start the
engine. It will go away as the fan clutch partially
disengages.
5-37

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 Trailer
LT TRNLeft Turn Signals and
SidemarkersFuses Usage
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 2 Rear 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
Center Instrument Panel Fuse Block
The center instrument panel utility block is located
underneath the instrument panel, to the left of the
steering column.
5-112

Device Usage
SEO Special Equipment Option
TRAILER Trailer Brake Wiring
UPFIT Uptter (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 Window Circuit
Breaker
Device Usage
SPARE Not Used
INFO Infotainment Harness Connection
Underhood Fuse Block
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 nger and pull straight out.
SeeEngine Compartment Overview on page 5-14for
more information on its location.
5-113

*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
5-115

Fuses Usage
SEO B2 Off-Road Lamps
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)Fuses Usage
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
SIRSupplemental Inatable
Restraint System
FRT PARKFront 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 Not Used
DRL Daytime Running Lamps
IPC/DICInstrument Panel Cluster/Driver
Information Center
HVAC/ECAS Climate Control Controller
5-116

(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.
6-9

Driving with a Trailer.......................................4-74
Dual Automatic Climate Control System.............3-27
Dual Climate Control System............................3-23
DVD
Rear Seat Entertainment System..................3-123
DVD Distortion..............................................3-133
DVD Messages.............................................3-133
DVD Player..................................................3-126
E
Easy Exit Seat...............................................2-68
Electrical System
Add-On Equipment.....................................5-110
Fuses and Circuit Breakers.........................5-110
Power Windows and Other Power Options....5-110
Windshield Wiper Fuses.............................5-110
Emissions Inspection and Maintenance
Programs...................................................3-52
Engine
Air Cleaner/Filter.........................................5-22
Battery.......................................................5-44
Check and Service Engine Soon Light............3-50
Coolant......................................................5-26
Coolant Heater............................................2-24
Coolant Temperature Gage...........................3-47
Drive Belt Routing.......................................6-17
Engine Compartment Overview......................5-14Engine (cont.)
Exhaust.....................................................2-43
Fan Noise..................................................5-37
Oil .............................................................5-17
Overheating................................................5-29
Starting......................................................2-23
ENGINE COOLANT HOT.................................3-70
Engine Hour Meter Display...............................3-41
Engine Oil Additives........................................5-20
ENGINE OVERHEATED..................................3-70
Entering or Exiting the Third Row Seats.............1-10
Entry Lighting.................................................3-19
Environmental Concerns..................................4-27
Erasing HomeLink
®Buttons..............................2-61
Event Data Recorders (EDR)............................. 7-9
Exit Lighting...................................................3-19
Express-Down Windows...................................2-17
Extender, Safety Belt.......................................1-47
Exterior Lamps...............................................3-14
F
Filter
Engine Air Cleaner......................................5-22
Finding a Program Type (PTY) Station
(RDS and XM™).......................3-85, 3-97, 3-112
Finding a Station..................3-78, 3-83, 3-95, 3-110
Finish Care..................................................5-104
6

H
Hazard Warning Flashers................................... 3-6
Head Restraints............................................... 1-9
Headlamp High/Low-Beam Changer.................... 3-8
Headlamps....................................................5-54
Bulb Replacement.......................................5-54
Front Turn Signal, Sidemarker and Daytime
Running Lamps........................................5-56
Halogen Bulbs............................................5-54
Roof Marker Lamps.....................................5-57
Side Identication Marker Lamps...................5-57
Headphones.................................................3-123
Heated Seats................................................... 1-6
Heating.........................................................3-31
Highway Hypnosis...........................................4-46
Hill and Mountain Roads..................................4-46
Hitches..........................................................4-72
HomeLink
®Transmitter....................................2-58
HomeLink®Transmitter, Programming................2-59
Hood
Checking Things Under................................5-12
Release.....................................................5-12
Horn............................................................... 3-6
How to Add Coolant to the Coolant
Surge Tank.................................................5-34
How to Add Fluid............................................5-26
How to Check Lubricant...................................5-51How to Check Power Steering Fluid..................5-39
How to Inspect...............................................5-22
How to Use This Manual...................................... ii
How to Wear Safety Belts Properly...................1-31
Hydroplaning..................................................4-42
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.....................................3-51
If the Light Is On Steady.................................3-51
If You Are Caught in a Blizzard.........................4-50
If You Are Stuck in Sand, Mud, Ice or Snow.......4-52
If You Do Decide To Pull A Trailer.....................4-66
Ignition Positions.............................................2-22
Infants and Young Children, Restraints...............1-50
Ination - Tire Pressure...................................5-69
Instrument Panel
Cluster.......................................................3-40
Overview..................................................... 3-4
Instrument Panel Brightness.............................3-18
Instrument Panel Fuse Block..........................5-111
Interior Lamps................................................3-18
J
Jump Starting.................................................5-44
8