2010 BUICK LACROSSE high beam

Lighting 5-7
has a voltmeter gage or a voltage
display on the Driver Information
Center (DIC), you may see the
voltage move up or down. This is
normal. If there is a problem, an
alert will be displayed.
The battery can be discharged at
idle if the electrical loads are very
high. This is true for all vehicles.
This is because the generator
(alternator) may not be spinning fast
enough at idle to produce all the
power that is needed for very high
electrical loads.
A high electrical load occurs when
several of the following are on, such
as: headlamps, high beams, fog
lamps, rear window defogger,
climate control fan at high speed,
heated seats, engine cooling fans,
trailer loads, and loads plugged into
accessory power outlets.EPM works to prevent excessive
discharge of the battery. It does this
by balancing the generator's output
and the vehicle's electrical needs.
It can increase engine idle speed to
generate more power, whenever
needed. It can temporarily reduce
the power demands of some
accessories.
Normally, these actions occur in
steps or levels, without being
noticeable. In rare cases at the
highest levels of corrective action,
this action may be noticeable to the
driver. If so, a Driver Information
Center (DIC) message might be
displayed, such as BATTERY
SAVER ACTIVE, BATTERY
VOLTAGE LOW, or LOW BATTERY.
If one of these messages display, it
is recommended that the driver
reduce the electrical loads as much
as possible. See
Driver Information
Center (DIC) on page 4‑25.Battery Power Protection
The battery saver feature is
designed to protect the vehicle's
battery.
If the exterior lamps or any interior
light is left on and the ignition is
turned off, the battery rundown
protection system automatically
turns the lamp off after about
10 minutes.

9-30 Vehicle Care
Headlamp Aiming
The headlamp aiming system has
been preset at the factory.
If the vehicle is damaged in an
accident, the aim of the headlamps
may be affected and adjustment
may be necessary.
It is recommended that a dealer/
retailer adjust the headlamps. To
re-aim the headlamps yourself, use
the following procedure.
The vehicle should be properly
prepared as follows:
.The vehicle should be placed so
the headlamps are 7.6 m (25 ft.)
from a light colored wall.
.The vehicle must have all four
tires on a level surface which is
level all the way to the wall.
.The vehicle should be placed so
it is perpendicular to the wall or
other flat surface.
.The vehicle should not have any
snow, ice, or mud on it.
.The vehicle should be fully
assembled and all other work
stopped while headlamp aiming
is being performed.
.The vehicle should be normally
loaded with a full tank of fuel and
one person or 75 kg (160 lbs)
sitting in the driver's seat.
.Tires should be properly inflated.
Headlamp aiming is done with the
vehicle's low-beam headlamps. The
high-beam headlamps will be
correctly aimed if the low-beam
headlamps are aimed properly.
To adjust the vertical aim, do the
following:
1. Open the hood. See Hood
on
page 9‑5
Base
Up-Level

Vehicle Care 9-33
Bulb Replacement
For the proper type of replacement
bulbs, seeReplacement Bulbson
page 9‑37.
For any bulb changing procedure
not listed in this section, contact
your dealer/retailer.
Halogen Bulbs
{WARNING
Halogen bulbs have pressurized
gas inside and can burst if you
drop or scratch the bulb. You or
others could be injured. Be sure
to read and follow the instructions
on the bulb package.
High Intensity Discharge
(HID) Lighting
{WARNING
The low beam high intensity
discharge lighting system
operates at a very high voltage.
If you try to service any of the
system components, you could be
seriously injured. Have your
dealer/retailer or a qualified
technician service them.
The up–level vehicle has HID
headlamps. The park lamp function
is also a function of the HID
headlamp. After an HID headlamp
bulb has been replaced, the beam
might be a slightly different shade
than it was originally. This is normal.
Headlamps, Front Turn
Signal and Parking
Lamps
Base Headlamp Assembly
The base model vehicle has a
halogen high-beam headlamp, a
low-beam/Daytime Running Lamp
(DRL) headlamp and a turn signal/
parking lamp on the headlamp
assembly.

9-34 Vehicle Care
To replace one of these bulbs:
1. Open the hood. SeeHood
on
page 9‑5.
A. Low-Beam Headlamp/DRL
B. High-Beam Headlamp
C. Parking/Turn Signal Lamp
2. If replacing a headlamp bulb, remove the dust cover from the
back of the headlamp housing
by turning counterclockwise
a quarter turn. 3. Remove the bulb socket from
the headlamp by turning
counterclockwise a quarter turn.
4. Remove the bulb from the socket.
5. Install the new bulb in the socket.
6. Install the bulb socket by turning clockwise a quarter turn.
7. If a headlamp bulb was replaced, Install the dust cover
in the back of the headlamp
housing by turning clockwise
a quarter turn.
Up–Level Headlamp Assembly
The up–level model vehicle has a
high intensity discharge (HID) high/
low beam, a dedicated DRL and a
turn signal lamp on the headlamp
assembly. The park lamp is also the
function of the HID headlamp. See
High Intensity Discharge (HID)
Lighting
on page 9‑33for more
information. To replace one of these bulbs:
1. Open the hood. See
Hood
on
page 9‑5.
A. DRL Lamp
B. Turn Signal Lamp
2. Turn the bulb socket counterclockwise to remove it
from the headlamp assembly.
3. Pull the bulb straight out from the socket.

Vehicle Care 9-37
A. Bulb Socket
B. Lamp Assembly
C. Bulb
3. Turn the bulb socket (A) counterclockwise to remove from
lamp assembly (C).
4. Pull the bulb (B) straight out of the bulb socket. 5. Push the replacement bulb
straight into the bulb socket and
turn the bulb socket clockwise to
install into lamp assembly.
6. Move the lamp assembly into the trunk lid engaging the clip
side first.
7. Push on the lamp side opposite the clip until the lamp assembly
snaps into place.
Replacement Bulbs
Exterior Lamp Bulb
Number
Back-Up Lamp W16W
Daytime Running
Lamp (Up-Level) 3157K
Fog Lamp H11LL
Front Turn Signal/
Park Lamp 3757NAK
Headlamp High
Beam (Base) H9
Headlamp Low
Beam (Base) H11LL
License Plate Lamp W5WLL
Rear Turn Signal 3757AK
For replacement bulbs not listed
here, contact your dealer/retailer.

9-40 Vehicle Care
J-CaseFuses Usage
28 Rear Window
Defogger
41 Brake
Vacuum Pump
42 Cooling Fan K2
45 Cooling Fan K1
Mini Fuses Usage 1 Transmission
Control Module
2 Engine Control
Module Battery
5 Engine Control
Module Ignition
8 Ignition Coils ‐Even
9 Ignition Coils ‐Odd
10 Engine Control
Module Mini Fuses Usage
11 Post Catalytic
Converter Oxygen
Sensor Heater
13 Trans Ignition / Fuel
System Control
Module
16 MAF
17 Airbag Module
18 SBZ Ignition
23 Variable Effort
Steering
29 Power Lumbar, Left
32 Body Control
Module
33 Heated Seat
34 Antilock Brake
System Valves
35 Amplifier
36 AFL Ignition
37 Right High Beam Mini Fuses Usage
38 Left High Beam
46 Cooling Fan Relay
47 Pre Catalytic
Converter Oxygen
Sensor Heater
48 Fog Lamps
49 Right High Intensity
Discharge
Headlamp
50 Left High Intensity
Discharge
Headlamp
51 Horn
52 Cluster Ignition
53 Inside Rearview
Mirror, Rear Vision
Camera,
Vacuum Pump
54 Heating, Ventilation
and Air Conditioning

INDEX i-5
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-49Additives . . . . . . . . . . . . . . . . . . . . . 8-51
Economy Driving . . . . . . . . . . . . . . 8-2
Filling a Portable Fuel
Container . . . . . . . . . . . . . . . . . . . 8-53
Filling the Tank . . . . . . . . . . . . . . . 8-52
Fuels in Foreign Countries . . . . 8-51
Gage . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Gasoline Specifications . . . . . . . 8-50
Low Fuel Warning Light . . . . . . . 4-24
Recommended . . . . . . . . . . . . . . . 8-50
Requirements, California . . . . . 8-51
System Messages . . . . . . . . . . . . 4-36
Fuses Engine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . 9-39
Fuses and Circuit Breakers . . . . . . . . . . . . . . . . . . . . 9-38
Instrument Panel Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . 9-41
Rear Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . 9-43G
GagesEngine CoolantTemperature . . . . . . . . . . . . . . . . 4-15
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Odometer . . . . . . . . . . . . . . . . . . . . . 4-14
Speedometer . . . . . . . . . . . . . . . . . 4-14
Tachometer . . . . . . . . . . . . . . . . . . . 4-14
Warning Lights and Indicators . . . . . . . . . . . . . . . . . . . 4-12
Garage Door Opener . . . . . . . . . . 4-45
Programming . . . . . . . . . . . . . . . . . 4-45
Gasoline Specifications . . . . . . . . . . . . . . . . . 8-50
General Information Service and Maintenance . . . . . 10-1
Towing . . . . . . . . . . . . . . . . . . . . . . . . 8-54
Vehicle Care . . . . . . . . . . . . . . . . . . . 9-2
Glove Box . . . . . . . . . . . . . . . . . . . . . . 3-1
GM Mobility Reimbursement Program . . . . . . . . . . . . . . . . . . . . . . 12-5
H
Halogen Bulbs . . . . . . . . . . . . . . . . . 9-33
Hazard Warning Flashers . . . . . . . 5-4
Head Restraints . . . . . . . . . . . . . . . . 2-2
Head-Up Display (HUD) . . . . . . . 4-28
HeadlampsAdaptive Forward
Lighting (AFL) . . . . . . . . . . . . . . . . 5-3
Aiming . . . . . . . . . . . . . . . . . . . . . . . . 9-30
Automatic . . . . . . . . . . . . . . . . . . . . . . 5-3
Bulb Replacement . . . . . . . . . . . . 9-33
Daytime Running Lamps (DRL) . . . . . . . . . . . . . . . . . 5-2
Flash-to-Pass . . . . . . . . . . . . . . . . . . 5-2
High Intensity Discharge (HID) Lighting . . . . . . . . . . . . . . . 9-33
High-Beam On Light . . . . . . . . . . 4-24
High/Low Beam Changer . . . . . . 5-2
Heated Steering Wheel . . . . . . . . . . . . . . . . 4-7

i-6 INDEX
Heated and Ventilated FrontSeats . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Heated Front Seats . . . . . . . . . . . . . 2-8
Heated Mirrors . . . . . . . . . . . . . . . . . 1-16
High-Beam On Light . . . . . . . . . . . 4-24
Highway Hypnosis . . . . . . . . . . . . . . 8-8
Hill and Mountain Roads . . . . . . . . 8-9
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
How to Wear Safety Belts Properly . . . . . . . . . . . . . . . . . . . . . . 2-13
I
Ignition Positions . . . . . . . . 8-18, 8-19
Ignition Transmission Lock
Check . . . . . . . . . . . . . . . . . . . . . . . . 9-28
Illumination Control . . . . . . . . . . . . . 5-5
Immobilizer . . . . . . . . . . . . . . . . . . . . 1-13
Infants and Young Children, Restraints . . . . . . . . . . . . . . . . . . . . 2-42
Instrument Cluster . . . . . . . . . . . . . 4-13
Instrument Panel . . . . . . . . . . . . . . . 5-5
Introduction . . . . . . . . . . . . . . . . . . .iii, 6-2
J
Jump Starting . . . . . . . . . . . . . . . . . . 9-75
K
Key and Lock Messages . . . . . . . 4-36
Keyless Entry Remote (RKE) System . . . 1-3, 1-5
Keyless Entry System . . . . . . . . . . 1-3
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
L
Labeling, Tire Sidewall . . . . . . . . . 9-47
Lamp Messages . . . . . . . . . . . . . . . 4-36
Lamps Daytime Running (DRL) . . . . . . . 5-2
Dome . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Exterior Controls . . . . . . . . . . . . . . . 5-1
Exterior Lamps Off
Reminder . . . . . . . . . . . . . . . . . . . . 5-2
Headlamps, Front Turn
Signal and Parking
Lamps . . . . . . . . . . . . . . . . . . . . . . 9-33
License Plate . . . . . . . . . . . . . . . . . 9-36 Lamps (cont.)
Malfunction Indicator . . . . . . . . . 4-17
Reading . . . . . . . . . . . . . . . . . . . . . . . 5-5
Sun Visor . . . . . . . . . . . . . . . . . . . . . . 5-5
Lap-Shoulder Belt . . . . . . . . . . . . . 2-19
LATCH System Replacing Parts After aCrash . . . . . . . . . . . . . . . . . . . . . . . 2-55
Latch, Lower Anchors and
Tethers for Children . . . . . . . . . . 2-48
Light Electric Parking Brake . . . . . . . . 4-20
Lighting Adaptive Forward . . . . . . . . . . . . . . 5-3
Entry . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Lights Airbag Readiness . . . . . . . . . . . . . 4-16
Antilock Brake System
(ABS) Warning . . . . . . . . . . . . . . 4-21
Charging System . . . . . . . . . . . . . 4-17
Cruise Control . . . . . . . . . . . . . . . . 4-25
Engine Oil Pressure . . . . . . . . . . 4-23