2007 BUICK LACROSSE Owner's Manual

Electrical System
Add-On Electrical Equipment
Notice:Do not add anything electrical to your
vehicle unless you check with your dealer
rst. Some electrical equipment can damage
your vehicle and the damage would not
be covered by your warranty. Some add-on
electrical equipment can keep other
components from working as they should.
Add-on equipment can drain your vehicle’s battery,
even if your vehicle is not operating.
Your vehicle has an airbag system. Before
attempting to add anything electrical to your
vehicle, seeServicing Your Airbag-Equipped
Vehicle on page 80.
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.
449

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.
450

Fuses Usage
DR/LCK
TRUNKDoor Locks, Trunk
RFA/MOD Remote Keyless Entry
PRK/SWTCH Ignition Key Lock
CLSTR Cluster
STR/WHL/
ILLUMSteering Wheel Controls
Illumination
ONSTAR/ALDL OnStar
®, Data Link
Fuses Usage
INT/ILLUM Interior Lamps
PWR/SEAT Power Seat
S/ROOF Sunroof
CNSTR Canister Vent
HVAC Climate Control System
HAZRD Turn Signal, Hazard
PRK/LAMP Park Lamps
CHMSL/BKUPCenter-High-Mounted
Stoplamp/Back-up Lamps
PWR/MIR Power Mirrors
CRUISE Cruise Control
RDO/AMP Radio, Amplier
HTD/SEAT Heated Seats
HTD/MIR Heated Mirrors
PWR/WNDW Power Window
Relays Usage
RAP Retained Accessory Power
PRK/LAMP Park Lamp Relay
R/DEFOG Rear Defogger Relay
451

Underhood Fuse Block
Some fuses and relays are located in the
underhood fuse block on the passenger’s side of
the vehicle in the engine compartment. See
Engine Compartment Overview on page 350for
more information on location.
Mini-Fuses Usage
1 Driver’s Side High-Beam
2 Passenger’s Side High-Beam
3 Driver’s Side Low-Beam
Mini-Fuses Usage
4 Passenger’s Side Low-Beam
5 Windshield Wiper
6 Washer/Regulated Voltage Control
7 Fog Lamps
8 Transaxle Control Module
9 Supplemental Inatable Restraint
10 Auxiliary Power
11 Horn
12 Emission
13 Air Conditioner Clutch
14 Oxygen Sensor
15 Powertrain Control Module
16Powertrain Control Module,
Electronic Throttle Control
17 Electronic Throttle Control
18 Display
19 Anti-lock Brake Solenoid
20 Fuel Injector
21 Transaxle Solenoid
22 Fuel Pump
23 Anti-lock Brake System
24 Ignition
452

J-Style Fuses Usage
25 Air Pump
26 Battery Main 1
27 Battery Main 2
28 Battery Main 3
29 Fan 1
30 Battery Main 4
31 Anti-lock Brake System Motor
32 Fan 2
33 Starter
Micro-Relays Usage
34 Headlamp High-Beam
35 Headlamp Driver Module
36 Fog Lamp
37 Ignition 1
38 Air Conditioning Compressor
39 Horn
40 Powertrain
41 Fuel Pump
Mini-Relays Usage
42 Fan 1
43 Fan 3
Mini-Relays Usage
44 Windshield Wiper High
45 Windshield Wiper
46 Fan 2
48 Crank
Spare Fuses Usage
49 Spare
50 Spare
51 Spare
52 Blank
53 Blank
54 Blank
Fuse Puller Usage
55 Fuse Puller
Diodes Usage
§Air Conditioner Compressor Clutch
Diode
453

Capacities and Specications
The following approximate capacities are given in English and metric conversions.
Capacities and Specications
ApplicationCapacities
English Metric
Air Conditioning Refrigerant R134aFor the air conditioning system refrigerant charge
amount, see the refrigerant caution label located
under the hood. See your dealer for more information.
Automatic Transaxle (Drain and Rell) 7.4 qt 7.0 L
Cooling System Including Reservoir
3.6L V6 and 3.8L V6 11.2 qt 10.6 L
Engine Oil with Filter
3.6L V6 5.5 qt 5.2 L
3.8L V6 4.5 qt 4.3 L
Fuel Tank
3.8L Engine (with NU6 emissions) sold new in CA, ME,
VT, NY, MA (see your dealer for bordering states)17.0 gal 64.4 L
3.8L Engine (without NU6 emissions) sold new in all
other states (see your dealer for more information)17.5 gal 66.2 L
3.6L Engines sold new in all states 17.5 gal 66.2 L
Wheel Nut Torque 100 lb ft
140Y
All capacities are approximate. When adding, be sure to ll to the approximate level, as recommended in this
manual. SeeScheduled Maintenance on page 462
454

Engine Specications
Engine VIN Code Transaxle Spark Plug Gap
3.6L V6 7 Automatic 0.044 inches (1.1 mm)
3.8L V6 2 Automatic 0.060 inches (1.52 mm)
455

✍NOTES
456