2004 CHEVROLET CLASSIC wiring

Lockout Protection
Lockout protection is intended to provide additional
security and convenience. While any door is open and
the key is in the ignition, the doors cannot be locked
by using the power door locks.
To override this feature, while the key is in the ignition
and any door is open, press and hold down the
power door lock switch for three seconds.
This feature cannot guarantee that you will never be
locked out of your vehicle. If the key is not in the ignition,
or if you use the manual door lock or the remote
keyless entry transmitter, you could still lock your key
inside your vehicle. Always remember to take your
key with you.
Leaving Your Vehicle
If you are leaving your vehicle, open your door and set
the locks from the inside, then get out and close the door.
Trunk
To unlock the trunk from the outside, insert the key and
turn the trunk lock cylinder. When closing the trunk
lid, push the truck lid in the center to ensure that the lock
fully latches.
{CAUTION:
It can be dangerous to drive with the trunk lid
open because carbon monoxide (CO) gas can
come into your vehicle. You can’t see or smell
CO. It can cause unconsciousness and even
death. If you must drive with the trunk lid open
or if electrical wiring or other cable
connections must pass through the seal
between the body and the trunk lid:
Make sure all other windows are shut.
Turn the fan on your heating or cooling
system to its highest speed and select the
control setting that will force outside air
into your vehicle. See “Climate Control
System” in the Index.
If you have air outlets on or under the
instrument panel, open them all the way.
See “Engine Exhaust” in the Index.
2-11

Air Bag Readiness Light
There is an air bag readiness light on the instrument
panel, 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 sensor, the air
bag modules, the wiring and the crash sensing and
diagnostic module. For more information on the air bag
system, seeSupplemental Restraint System (SRS)
on page 1-56.
This light will come on
when you start your
vehicle, and it will flash 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.{CAUTION:
If the air bag readiness light stays on after you
start your vehicle, it means the air bag system
may not be working properly. The air bags in
your vehicle may not inate in a crash, or they
could even inate without a crash. To help avoid
injury to yourself or others, have your vehicle
serviced right away if the air bag readiness light
stays on after you start your vehicle.
The air bag readiness light should flash for a few
seconds when you turn the ignition key to ON. If the
light doesn’t come on then, have it fixed so it will
be ready to warn you if there is a problem.
3-26

Turn Signals When Towing a Trailer
When you tow a trailer, your vehicle may need additional
wiring. Check with your dealer. The arrows on your
instrument panel will flash whenever you signal a turn or
lane change. Properly hooked up, the trailer lamps
will also flash, telling other drivers you are about to turn,
change lanes or stop.
When towing a trailer, the arrows on your instrument
panel will flash for turns even if the bulbs on the trailer
are burned out. Thus, you may think drivers behind
you are seeing your signal when they are not. It
is important to check occasionally to be sure the trailer
bulbs are still working.
Driving On Grades
Notice:Do not tow on steep continuous grades
exceeding 6 miles (9.6 km). Extended, higher than
normal engine and transaxle temperatures may result
and damage your vehicle. Frequent stops are very
important to allow the engine and transaxle to cool.
Reduce speed and shift to a lower gearbeforeyou start
down a long or steep downgrade. If you do not shift
down, you might have to use your brakes so much that
they would get hot and no longer work well.
Pay attention to the engine coolant gage. If the indicator
is in the red area, turn off the air conditioning to reduce
engine load. SeeEngine Overheating on page 5-22.
Parking on Hills
{CAUTION:
You really should not park your vehicle, with a
trailer attached, on a hill. If something goes
wrong, your rig could start to move. People
can be injured, and both your vehicle and the
trailer can be damaged.
But if you ever have to park your rig on a hill, here is
how to do it:
1. Apply your regular brakes, but do not shift into
PARK (P) yet.
2. Have someone place chocks under the trailer
wheels.
3. When the wheel chocks are in place, release the
regular brakes until the chocks absorb the load.
4. Reapply the regular brakes. Then apply your
parking brake and shift into PARK (P).
5. Release the regular brakes.
4-43

Appearance Care............................................5-80
Cleaning the Inside of Your Vehicle.................5-80
Care of Safety Belts......................................5-83
Weatherstrips...............................................5-83
Cleaning the Outside of Your Vehicle..............5-83
Sheet Metal Damage.....................................5-85
Finish Damage.............................................5-85
Underbody Maintenance................................5-86
Chemical Paint Spotting.................................5-86
Vehicle Care/Appearance Materials..................5-86
Vehicle Identication......................................5-88
Vehicle Identification Number (VIN).................5-88
Service Parts Identification Label.....................5-88Electrical System............................................5-89
Add-On Electrical Equipment..........................5-89
Headlamp Wiring..........................................5-89
Windshield Wiper Fuses................................5-89
Power Windows and Other Power Options.......5-89
Fuses and Circuit Breakers............................5-90
Capacities and Specications..........................5-95
Normal Maintenance Replacement Parts..........5-96
Section 5 Service and Appearance Care
5-2

1. Open the hood.
2. Carefully pull directly up on the two latches to
unhook the lamp assembly.
3. Remove the lamp assembly from the vehicle by
pulling it forward. Use care not to scratch the
vehicle with the lamp or the lamp with the fender.4. Unclip the wiring harness and twist the socket
less than one-quarter turn counterclockwise and
remove it.
5. Gently wiggle the bulb from the socket. Replace the
old bulb with a new bulb.
6. Turn the socket back into place and reconnect the
wiring harness to the socket.
7. Return the lamp assembly to its original position.
Be sure to line up the holes in the lamp assembly
to the round ends of the mounting pins.
8. Press down on the two latches to hook the lamp
assembly in place.
5-46

Electrical System
Add-On Electrical Equipment
Notice:Don’t add anything electrical to your vehicle
unless you check with your dealer rst. Some
electrical equipment can damage your vehicle and
the damage wouldn’t be covered by your warranty.
Some add-on electrical equipment can keep other
components from working as they should.
Your vehicle has an air bag system. Before attempting
to add anything electrical to your vehicle, see
Servicing Your Air Bag-Equipped Vehicle on page 1-62.
Headlamp Wiring
The headlamp wiring is protected by fuses, one for each
headlamp, in the fuse block. An electrical overload
will cause the lamps to turn off. If this happens, have
your headlamp wiring checked right away.
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 fixed.
Power Windows and Other Power
Options
Circuit breakers in the fuse block 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 fixed or
goes away.
5-89

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 in the wiring itself.
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 a 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.
There are three fuse blocks in your vehicle: two
instrument panel fuse blocks and the engine
compartment fuse block.
There is a fuse puller located on the engine
compartment fuse block. It can be used to easily
remove fuses from the fuse block.The instrument panel fuse
blocks are located at each
end of the instrument
panel. To access
the fuses, open the fuse
panel door by pulling out.
To reinstall the door, insert the hooks at the front end
first, then push the door into the instrument panel
to secure it.
5-90

D
Daytime Running Lamps (DRL).........................3-13
Defensive Driving............................................. 4-2
Defogging and Defrosting.................................3-20
Delayed Headlamps........................................3-14
Delayed Locking............................................... 2-8
Dinghy Towing................................................4-30
Doing Your Own Service Work........................... 5-3
Dolly Towing..................................................4-32
Dome Lamp...................................................3-15
Door
Ajar Light...................................................3-34
Delayed Locking........................................... 2-8
Door Ajar Reminder....................................... 2-8
Locks.......................................................... 2-7
Power Door Locks......................................... 2-8
Programmable Automatic Door Locks............... 2-9
Rear Door Security Locks.............................2-10
Driver
Position, Safety Belt.....................................1-14
Six-Way Power Seat...................................... 1-3
Driving
At Night.....................................................4-14
City...........................................................4-18
Defensive..................................................... 4-2
Drunken....................................................... 4-2
Freeway.....................................................4-19Driving (cont.)
Hill and Mountain Roads..............................4-22
In Rain and on Wet Roads...........................4-15
Winter........................................................4-23
Driving On Grades..........................................4-43
Driving on Snow or Ice....................................4-24
Driving Through Deep Standing Water...............4-17
Driving Through Flowing Water.........................4-17
Driving with a Trailer.......................................4-42
E
Electrical System
Add-On Equipment......................................5-89
Fuses and Circuit Breakers...........................5-90
Headlamp Wiring.........................................5-89
Power Windows and Other Power Options......5-89
Windshield Wiper Fuses...............................5-89
Emergency Trunk Release Handle.....................2-12
Emissions Inspection and Maintenance
Programs...................................................3-32
Engine
Air Cleaner/Filter.........................................5-17
Battery.......................................................5-38
Check and Service Engine Soon Light............3-30
Coolant......................................................5-19
Coolant Heater............................................2-19
4