2005 CHEVROLET TRAIL BLAZER towing

Trailer Wiring Harness
Your vehicle may be equipped with a seven-wire trailer
towing harness. This harness has a seven-pin
universal heavy-duty trailer connector that is attached to
a bracket on the hitch platform. The seven-wire
harness contains the following trailer circuits:
Yellow: Left Stop/Turn Signal
Dark Green: Right Stop/Turn Signal
Brown: Running Lamps
White: Ground
Light Green: Back-up Lamps
Dark Blue: Electric Brakes
Red: Battery Feed (The chassis wiring ring terminal
must be fastened to a stud on the underhood
electrical center before the trailer feed will
become active.)
If you need to tow a light-duty trailer with a standard
four-way round pin connector, an adapter connector is
available from your dealer.
Your vehicle is also equipped with wiring for an electric
trailer brake controller. These wires are located
inside the vehicle on the driver’s side under the
instrument panel. These wires should be connected to
an electric trailer brake controller by your dealer or
a qualied service center.
4-64

6. Start the engine and let it run until you can feel the
upper radiator hose getting hot. Watch out for the
engine cooling fan.
7. By this time, the coolant level inside the radiator
ller neck may be lower. If the level is lower, add
more of the proper DEX-COOL
®coolant mixture
through the ller neck until the level reaches
the base of the ller neck.
8. Then replace the pressure cap. At any time during
this procedure if coolant begins to ow out of the
ller neck, reinstall 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 clutch is not engaged. This improves fuel
economy and reduces fan noise. Under heavy vehicle
loading, trailer towing, and/or high outside temperatures,
the fan speed increases when the clutch 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 disengages.
5-33

(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 airbag
coverings, and have them repaired or replaced.
The airbag 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)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. This service
can be complex; you should have your dealer perform
this service. See Engine Coolant on page 5-23 for
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)If you drive regularly under dusty conditions, inspect
the lter at each engine oil change.
(l)Visually inspect belt for fraying, excessive cracks, or
obvious damage. Replace belt if necessary.
6-8

Q
Questions and Answers About Safety Belts.........1-15
R
Radiator Pressure Cap....................................5-25
Radios..........................................................3-62
Care of Your Cassette Tape Player...............3-131
Care of Your CD and DVD Player................3-132
Care of Your CDs and DVDs.......................3-132
Navigation/Radio System, see Navigation
Manual.................................................3-116
Radio with Cassette and CD.........................3-89
Radio with CD....................................3-63, 3-73
Radio with Six-Disc CD..............................3-103
Rear Seat Audio........................................3-128
Setting the Time..........................................3-62
Theft-Deterrent..........................................3-129
Understanding Reception............................3-131
Rainsense™ Wipers.......................................... 3-9
Reading Lamps..............................................3-18
Rear Axle......................................................5-44
Locking........................................................ 4-9
Rear Climate Control System............................3-27
Rear Compartment Storage Panel/Cover............2-56
Rear Door Security Locks................................2-12
Rear Floor Storage Lid....................................2-58
Rear Safety Belt Comfort Guides......................1-26Rear Seat Audio (RSA)..................................3-128
Rear Seat Entertainment System.....................3-116
Rear Seat Operation......................................... 1-7
Rear Seat Passengers, Safety Belts..................1-23
Rearview Mirror with Compass..........................2-38
Rearview Mirror with Compass and
Temperature...............................................2-42
Rearview Mirror with OnStar®...........................2-37
Rearview Mirror with OnStar®and Compass.......2-40
Rearview Mirror with OnStar®, Compass, and
Temperature Display....................................2-44
Rearview Mirrors.............................................2-37
Reclining Seatbacks.......................................... 1-5
Recommended Fluids and Lubricants.................6-12
Recovery Hooks.............................................4-42
Recreational Vehicle Towing.............................4-49
Reduced Engine Power Light............................3-46
Remote Keyless Entry System............................ 2-5
Remote Keyless Entry System, Operation............ 2-6
Removing the Flat Tire and Installing the
Spare Tire..................................................5-69
Removing the Spare Tire and Tools...................5-67
Replacement Bulbs.........................................5-48
Reporting Safety Defects
Canadian Government..................................7-11
General Motors...........................................7-11
United States Government............................7-11
Restraint System Check
Checking the Restraint Systems....................1-67
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Tires (cont.)
Tire Sidewall Labelling..................................5-51
Tire Terminology and Denitions....................5-54
Uniform Tire Quality Grading.........................5-61
Wheel Alignment and Tire Balance.................5-62
Wheel Replacement.....................................5-63
When It Is Time for New Tires......................5-59
Top Strap......................................................1-39
Top Strap Anchor Location...............................1-41
Towing
Recreational Vehicle.....................................4-49
Towing a Trailer..........................................4-53
Your Vehicle...............................................4-49
Traction
Assist System (TAS)...................................... 4-8
Transmission
Fluid, Automatic...........................................5-21
Transmission Operation, Automatic....................2-24
Trip Odometer................................................3-33
Turn and Lane-Change Signals.......................... 3-7
Turn Signal/Multifunction Lever........................... 3-7U
Understanding Radio Reception.......................3-131
Uniform Tire Quality Grading............................5-61
V
Vehicle
Control........................................................ 4-5
Damage Warnings........................................... iv
Loading......................................................4-43
Symbols......................................................... iv
Vehicle Customization, DIC..............................3-56
Vehicle Data Collection and Event Data
Recorders..................................................7-10
Vehicle Identication
Number (VIN).............................................5-89
Service Parts Identication Label...................5-89
Vehicle Personalization
Memory Seat..............................................2-60
Ventilation Adjustment......................................3-27
Visors...........................................................2-16
Voltmeter Gage..............................................3-38
13