2003 CHEVROLET TRAIL BLAZER turn signal

Trailer Wiring HarnessYour 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
·Red: Battery Feed
·Dark Blue: Electric Brakes
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 quali®ed service center.
4-60

Service............................................................5-3
Doing Your Own Service Work.........................5-3
Adding Equipment to the Outside of
Your Vehicle..............................................5-4
Fuel................................................................5-4
Gasoline Octane............................................5-4
Gasoline Speci®cations....................................5-5
California Fuel...............................................5-5
Additives.......................................................5-6
Fuels in Foreign Countries...............................5-6
Filling Your Tank............................................5-7
Filling a Portable Fuel Container.......................5-9
Checking Things Under the Hood....................5-10
Hood Release..............................................5-10
Engine Compartment Overview.......................5-12
Engine Oil...................................................5-16
Engine Air Cleaner/Filter................................5-20
Automatic Transmission Fluid.........................5-22
Engine Coolant.............................................5-24
Radiator Pressure Cap..................................5-26
Engine Overheating.......................................5-27
Cooling System............................................5-29
Engine Fan Noise.........................................5-35Power Steering Fluid.....................................5-36
Windshield Washer Fluid................................5-37
Brakes........................................................5-38
Battery........................................................5-41
Jump Starting...............................................5-42
Rear Axle.......................................................5-47
Four-Wheel Drive............................................5-48
Bulb Replacement..........................................5-50
Taillamps and Turn Signal Lamps...................5-50
Replacement Bulbs.......................................5-51
Windshield Wiper Blade Replacement..............5-51
Tires..............................................................5-54
In¯ation - Tire Pressure.................................5-54
Tire Inspection and Rotation...........................5-55
When It Is Time for New Tires.......................5-57
Buying New Tires.........................................5-58
Uniform Tire Quality Grading..........................5-59
Wheel Alignment and Tire Balance..................5-60
Wheel Replacement......................................5-61
Tire Chains..................................................5-62
If a Tire Goes Flat........................................5-63
Changing a Flat Tire.....................................5-64
Section 5 Service and Appearance Care
5-1

Bulb Replacement
For the type of bulbs, seeReplacement Bulbs on
page 5-51.
For any bulb changing procedure not listed in this
section, contact your dealer.
Taillamps and Turn Signal Lamps
1. Open the liftgate.2. Remove the two
screws from the lamp
assembly.
3. Pull the assembly away from the vehicle.
5-50

4. Unclip the wiring harness (A) and remove the three
socket retaining screws (B).
5. Remove the socket by releasing the retaining tabs.
6. Holding the socket, pull the bulb to release it
from the socket.
7. Push the new bulb into the socket until it clicks.
8. Reinstall the socket and screws.
9. Reconnect the wiring harness.
10. Reinstall the lamp assembly and tighten the screws.
11. Close the liftgate.
Replacement Bulbs
Exterior Lamp Bulb Number
Taillamps 3157
Rear Turn Signal Lamps 3157
For any bulb not listed here, contact your dealer.
Windshield Wiper Blade
Replacement
Windshield wiper blades should be inspected at least
twice a year for wear or cracking.
Notice:Allowing the wiper blade arm to touch the
windshield when no wiper blade is installed
could damage the windshield. Any damage that
occurs would not be covered by your warranty. Do
not allow the wiper blade arm to touch the
windshield.
1. To remove the old wiper blades, lift the wiper arm
until it locks into a vertical position.
5-51

Fuses Usage
24 Unlock
25 Blank
26 Blank
27 OH Battery/OnStar
žSystem
29 RainsenseŸ Wipers
30 Parking Lamps
31Truck Body Controller 4 Cruise
Control
32 Truck Body Controller 5
33 Front Wipers
34 Vehicle Stop
35 Blank
36Heat Ventilation Air
Conditioning B
37 Front Parking Lamps
38 Left Turn Signal
Fuses Usage
39Heat Ventilation Air
Conditioning 1
40 Truck Body Controller 4
41 Radio
42 Trailer Park
43 Right Turn Signal
44 Heat Ventilation Air Conditioning
45 Rear Fog Lamps
46 Auxiliary Power 1
47 Ignition 0
48 Four-Wheel Drive
49 Blank
50 Truck Body Controller Ignition
51 Brakes
52 Truck Body Controller Run
5-97

Fuses Usage
22 Retained Accessory Power
23 Blank
24 Unlock
25 Blank
26 Blank
27 OH Battery/OnStar
žSystem
28 Sunroof
29 RainsenseŸ Wipers
30 Parking Lamps
31Truck Body Controller 4
Cruise Control
32 Truck Body Controller 5
33 Front Wipers
34 Vehicle Stop
35 Blank
36Heat Ventilation Air
Conditioning B
Fuses Usage
37 Front Parking Lamps
38 Left Turn Signal
39Heat Ventilation Air
Conditioning 1
40 Truck Body Controller 4
41 Radio
42 Trailer Park
43 Right Turn Signal
44 Heat Ventilation Air Conditioning
45 Rear Fog Lamps
46 Auxiliary Power 1
47 Ignition 0
48 Four-Wheel Drive
49 Blank
50 Truck Body Controller Ignition
51 Brakes
52 Truck Body Controller Run
5-99

Automatic Transmission Shift Lock Control
System Check.............................................6-14
Automatic Transmission...................................5-22
Fluid..........................................................5-22
Operation...................................................2-22
B
Backglass Wiper Blade Replacement.................5-53
Backing Up....................................................4-57
BATTERY NOT CHARGING.............................3-61
Battery Replacement......................................... 2-7
Battery Run-Down Protection............................3-19
Battery..........................................................5-41
Before Leaving on a Long Trip.........................4-35
Before You Drive............................................3-93
Before You Go Off-Roading..............................4-16
Body Lubrication Service..................................6-13
Brake Adjustment............................................5-40
Brake Fluid....................................................5-38
Brake Pedal Travel.........................................5-40
Brake Wear...................................................5-40
Brake............................................................2-28
Parking......................................................2-28
System Inspection.......................................6-17
System Warning Light..................................3-41
Brakes..........................................................5-38
Braking in Emergencies..................................... 4-8
Braking........................................................... 4-6Break-In, New Vehicle.....................................2-18
Bulb Replacement...........................................5-50
Replacement Bulbs......................................5-51
Taillamps and Turn Signal Lamps..................5-50
Buying New Tires...........................................5-58
C
California Fuel.................................................. 5-5
Canada ± Customer Assistance.......................... 7-4
Canadian Owners................................................ ii
Canadian Roadside Assistance........................... 7-6
Capacities and Speci®cations..........................5-100
Carbon Monoxide...................4-38, 4-50, 2-13, 2-32
Care of.........................................................5-82
Safety Belts................................................5-82
Your Cassette Tape Player..........................3-107
Your CD and DVD Player...........................3-108
Your CDs and DVDs..................................3-108
Cargo Cover..................................................2-49
Cargo Tie Downs............................................2-50
Cassette Tape Messages.................................3-79
Cassette Tape Player Service...........................6-11
Chains, Tires..................................................5-62
Charging System Light....................................3-39
Check...........................................................3-43
Engine Light...............................................3-43
Gages Warning Light...................................3-49
CHECK WASHER FLUID.................................3-62
2

Steering in Emergencies..................................4-11
Steering, Suspension and Front Drive Axle Boot
and Seal Inspection.....................................6-16
Steering Tips..................................................4-10
Steering Wheel Climate Controls.......................3-34
Steering Wheel Controls, Audio.......................3-106
Steering........................................................4-10
Stereo RCA Jacks..........................................3-94
Storage Areas................................................2-49
Convenience Net.........................................2-49
Front Storage Area......................................2-44
Glove Box..................................................2-43
Luggage Carrier..........................................2-47
Overhead Console.......................................2-43
Rear Floor Storage Lid.................................2-48
Storing a Flat or Spare Tire and Tools...............5-75
Stuck in Sand, Mud, Ice or Snow......................4-42
Sun Visors.....................................................2-15
Sunglasses Storage Compartment.....................2-43
Sunroof.........................................................2-50
T
Table............................................................2-47
Tachometer....................................................3-38
Taillamps.......................................................5-50
Turn Signal Lamps......................................5-50
Testing the Alarm............................................2-17
Theft-Deterrent, Radio....................................3-105Theft-Deterrent Systems...................................2-16
Content Theft-Deterrent................................2-16
Passlock
ž...................................................2-18
Tilt Wheel........................................................ 3-7
Tire In¯ation Check.........................................6-11
Tires.............................................................5-54
Buying New Tires........................................5-58
Chains.......................................................5-62
Changing a Flat Tire....................................5-64
If a Tire Goes Flat.......................................5-63
In¯ation -- Tire Pressure...............................5-54
Inspection and Rotation................................5-55
Uniform Tire Quality Grading.........................5-59
Wheel Alignment and Tire Balance.................5-60
Wheel Replacement.....................................5-61
When It Is Time for New Tires......................5-57
To Use the Engine Coolant Heater....................2-21
Top Strap Anchor Location...............................1-39
Top Strap......................................................1-38
Torque Lock...................................................2-31
Total Weight on Your Vehicle's Tires..................4-54
Towing..........................................................4-44
Recreational Vehicle.....................................4-44
Towing a Trailer..........................................4-50
Your Vehicle...............................................4-44
Traction........................................................... 4-9
Assist System (TAS)...................................... 4-9
Trailer Brakes.................................................4-55
Trailer Wiring Harness.....................................4-60
TRANS HOT IDLE ENGINE.............................3-62
14