2005 BUICK LACROSSE wiring

Trunk
{CAUTION:
It can be dangerous to drive with the trunk lid
open because carbon monoxide (CO) gas can
come into your vehicle. You cannot 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.
SeeEngine Exhaust on page 2-30.
Trunk Lock
To unlock the trunk from the outside, use the remote
keyless entry transmitter. SeeRemote Keyless
Entry System Operation on page 2-4for more
information.
The ignition must be off, or the transaxle must be in
PARK (P), to unlock the trunk.
Remote Trunk Release
This feature is used to unlock the trunk from inside the
vehicle using the power door lock switch.
Press and hold the top of
the driver’s or front
passenger’s power
door lock switch for
one and one-half seconds
to unlock the trunk.
The vehicle must be in PARK (P) to unlock the trunk.
2-13

Airbag Readiness Light
There is an airbag readiness light on the instrument
panel, which shows the airbag symbol. The system
checks the airbag’s electrical system for malfunctions.
The system check includes the airbag modules, the
wiring and the crash sensing and diagnostic module. For
more information on the airbag system, seeAirbag
System on page 1-51.
This light will come on
when the vehicle is
started, and it will ash for
a few seconds. Then
the light should go out.
This means the system is
functioning properly.
If the airbag readiness light stays on after the vehicle is
started, or comes on as the vehicle is being driven,
there may be an electrical problem and the airbag
system may not work properly. Have the vehicle
serviced right away.{CAUTION:
If the airbag readiness light stays on after you
start your vehicle, it means the airbag system
may not be working properly. The airbags 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 airbag readiness light
stays on after you start your vehicle.
The airbag readiness light should ash for a few
seconds when you turn the ignition key to RUN. If the
light does not come on then, have it xed so it will
be ready to warn you if there is a problem.
3-33

Before starting, check all trailer hitch parts and
attachments, safety chains, electrical connector, lamps,
tires, and mirror adjustment. If the trailer has electric
brakes, start the vehicle and trailer moving and
then apply the trailer brake controller by hand to be sure
the brakes are working. This lets you check the
electrical connection at the same time.
During your trip, check occasionally to be sure that the
load is secure, and that the lamps and any trailer
brakes are still working.
Following Distance
Stay at least twice as far behind the vehicle ahead as
when driving the vehicle without a trailer. This can
help avoid situations that require heavy braking
and sudden turns.
Passing
More passing distance is needed up ahead when
towing a trailer. And, because the vehicle is a good deal
longer with the trailer, you will need to go much farther
beyond the vehicle you have passed before you
can return to the proper lane.
Backing Up
Hold the bottom of the steering wheel with one hand.
Then, to move the trailer to the left, move that hand
to the left. To move the trailer to the right, move your
hand to the right. Always back up slowly and, if possible,
have someone guide you.
Making Turns
Notice:Making very sharp turns while trailering
could cause the trailer to come in contact with the
vehicle. Your vehicle could be damaged. Avoid
making very sharp turns while trailering.
When turning with a trailer, make wider turns than
normal. Do this so the trailer will not strike soft shoulders,
curbs, road signs, trees, or other objects. Avoid jerky or
sudden maneuvers. Signal well in advance.
Turn Signals When Towing a Trailer
When towing a trailer, the vehicle may need a different
turn signal asher and/or extra wiring. Check with your
dealer. The arrows on the instrument panel will ash
whenever signaling a turn or lane change. Properly
hooked up, the trailer lamps will also ash, telling other
drivers you are about to turn, change lanes or stop.
When towing a trailer, the arrows on the instrument
panel will ash for turns even if the bulbs on the trailer
are burned out. 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.
4-39

Tire Chains..................................................5-66
If a Tire Goes Flat........................................5-67
Changing a Flat Tire.....................................5-68
Removing the Spare Tire and Tools................5-69
Removing the Flat Tire and Installing the
Spare Tire................................................5-71
Storing a Flat or Spare Tire and Tools............5-76
Compact Spare Tire......................................5-77
Appearance Care............................................5-78
Fabric/Carpet...............................................5-78
Vinyl...........................................................5-80
Leather.......................................................5-80
Instrument Panel..........................................5-80
Interior Plastic Components............................5-80
Glass Surfaces.............................................5-80
Care of Safety Belts......................................5-81
Weatherstrips...............................................5-81
Washing Your Vehicle...................................5-81
Cleaning Exterior Lamps/Lenses.....................5-81
Finish Care..................................................5-82Windshield and Wiper Blades.........................5-82
Aluminum or Chrome-Plated Wheels................5-83
Tires...........................................................5-83
Sheet Metal Damage.....................................5-84
Finish Damage.............................................5-84
Underbody Maintenance................................5-84
Chemical Paint Spotting.................................5-84
Vehicle Care/Appearance Materials..................5-85
Vehicle Identication......................................5-86
Vehicle Identication Number (VIN).................5-86
Service Parts Identication Label.....................5-86
Electrical System............................................5-87
Add-On Electrical Equipment..........................5-87
Headlamp Wiring..........................................5-87
Windshield Wiper Fuses................................5-87
Power Windows and Other Power Options.......5-88
Fuses and Circuit Breakers............................5-88
Instrument Panel Fuse Block..........................5-88
Underhood Fuse Block..................................5-90
Capacities and Specications..........................5-92
Section 5 Service and Appearance Care
5-2

3. Remove the four plastic wing nuts retaining the
trunk trim. There are two wing nuts located on
the driver’s side (shown) and two located on the
passenger’s side of the vehicle.
4. Pull back the trunk trim.5. Remove the two wing nuts holding the taillamp
assembly in place.
6. Pull out the taillamp assembly and disconnect the
wiring harness.
5-49

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 airbag system. Before attempting to
add anything electrical to your vehicle, seeServicing
Your Airbag-Equipped Vehicle on page 1-64.
Headlamp Wiring
The headlamp wiring is protected by a circuit breaker in
the underhood fuse block. An electrical overload will
cause the headlamps to go on and off, or in some cases
to remain off. If this happens, have the headlamp
system checked right away.
Windshield Wiper Fuses
The windshield wiper motor is protected by a 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, have
it xed.
5-87

Power Windows and Other
Power Options
Circuit breakers in the instrument panel 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 xed.
Fuses and Circuit Breakers
The wiring circuits in the vehicle are protected from
short circuits by a combination of fuses, circuit breakers
and in the fuse block wiring itself. This greatly reduces
the chance of res caused by electrical problems.
Look at the silver-colored band inside the fuse. If the
band is broken or melted, replace the fuse. Make sure a
bad fuse is replaced with a new one of the identical
size and rating.
Instrument Panel Fuse Block
The instrument panel fuse
block is located on the
passenger’s side of
the instrument panel. Pull
off the cover labeled
FUSES to expose the
fuse block.
5-88

Cruise Control Lever.......................................3-10
Cruise Control Light........................................3-43
Cupholder(s)..................................................2-40
Customer Assistance Information
Courtesy Transportation.................................. 7-7
Customer Assistance for Text
Telephone (TTY) Users............................... 7-4
Customer Assistance Offices........................... 7-4
Customer Satisfaction Procedure..................... 7-2
GM Mobility Reimbursement Program............... 7-5
Reporting Safety Defects to General Motors....7-11
Reporting Safety Defects to the Canadian
Government............................................7-11
Reporting Safety Defects to the United States
Government............................................7-10
Roadside Assistance Program......................... 7-6
Service Publications Ordering Information........7-11
D
Daytime Running Lamps/Automatic
Headlamp System.......................................3-14
Defensive Driving............................................. 4-2
Delayed Entry Lighting.....................................3-17
Delayed Exit Lighting.......................................3-17
Delayed Locking.............................................2-11
Doing Your Own Service Work........................... 5-4
Door
Ajar Light...................................................3-45Door (cont.)
Delayed Locking..........................................2-11
Locks........................................................2-10
Power Door Locks.......................................2-11
Driver
Position, Safety Belt.....................................1-15
Driver Information Center (DIC).........................3-47
DIC Operation and Displays..........................3-47
DIC Vehicle Personalization..........................3-71
DIC Warnings and Messages........................3-53
Driving
At Night.....................................................4-15
City...........................................................4-19
Defensive..................................................... 4-2
Drunken....................................................... 4-2
Freeway.....................................................4-20
Hill and Mountain Roads..............................4-22
In Rain and on Wet Roads...........................4-16
Rocking Your Vehicle to Get it Out.................4-28
Winter........................................................4-24
Dual Automatic Climate Control System.............3-24
E
Electrical System
Add-On Equipment......................................5-87
Fuses and Circuit Breakers...........................5-88
Headlamp Wiring.........................................5-87
Instrument Panel Fuse Block.........................5-88
4