ECU BUICK LUCERNE 2010 Service Manual

3. Fill the cooling system with the proper DEX-COOLcoolant mixture, up to the base of the filler neck.
See Engine Coolant (4.6L Engine)
on page 6‑27orEngine Coolant (3.9L Engine) on page 6‑31.
4. Then fill the coolant recovery tank to the COLD FILL line.
5. Install the coolant recovery tank cap and the pressure cap. After a day or two of driving, when
the engine is cold, check the coolant level in the
recovery tank. If it is low, refill it to the COLD
FILL line.
If the coolant in the recovery tank is constantly low, you
should have a dealer service department inspect the
vehicle for leaks.
Notice: If the pressure cap is not tightly installed,
coolant loss and possible engine damage may
occur. Be sure the cap is properly and tightly
secured.
Engine Overheating
The vehicle has several indicators to warn of engine
overheating.
You will find a warning light about a hot engine as
well as an engine coolant temperature gauge on the
instrument panel cluster.
You may decide not to lift the hood when this warning
appears, but instead get service help right away.
See Roadside Assistance Program on page 8‑8.
If you do decide to lift the hood , make sure the vehicle
is parked on a level surface.
Then check to see if the engine cooling fans are
running. If the engine is overheating, both fans should
be running. If they are not, do not continue to run the
engine and have the vehicle serviced.
Notice: Engine damage from running the engine
without coolant is not covered by the warranty.
Notice: If the engine catches fire while driving with
no coolant, the vehicle can be badly damaged. The
costly repairs would not be covered by the vehicle
warranty. See Overheated Engine Protection
Operating Mode
on page 6‑37for information on
driving to a safe place in an emergency.
6-35

{WARNING:
A battery that is not properly vented can let
sulfuric acid fumes into the area under the rear
seat cushion. These fumes can damage the rear
seat safety belt systems. You might not be able to
see this damage and the safety belts might not
provide the protection needed in a crash. If a
replacement battery is ever needed, it must be
vented in the same manner as the original battery.
Always make sure that the vent hose is properly
reattached before reinstalling the seat cushion.
To be sure the vent hose (A) is properly attached, the
vent hose connectors (B) must be securely reattached
to the vent outlets (C) on each side of the battery and
the vent assembly grommet (D) must be secured to the
floor pan (E).
6-43

To replace one of these bulbs:1. Open the trunk. See Trunk on page 3‑12.
2. Remove the convenience net.
3. Remove the plastic wing nuts retaining the trunk trim.
4. Pull back the trunk trim.
5. Remove the three hex nuts holding the taillamp assembly in place.
6. Pull the taillamp assembly straight out. 7. Turn the bulb socket counterclockwise and pull it
straight out to remove it.
8. Pull the old bulb straight out of the socket.
9. Push the new bulb straight in until it clicks.
10. Push the bulb socket in and turn it clockwise to secure it in the taillamp assembly.
11. Push the taillamp assembly straight in to its original location.
When reinstalling the taillamp assembly, make
sure the plastic pin on the taillamp assembly lines
up and is inserted correctly into the opening of the
vehicle.
12. Reinstall the three hex nuts holding the taillamp assembly in place.
13. Put the trunk trim back into place.
14. Reinstall the plastic wing nuts that retain the trunk trim.
15. Put the convenience net back in its original location.
6-53

Taillamps and Back-Up Lamps
A. Taillamp
B. Back-up Lamp
To replace an auxiliary taillamp or back-up lamp bulb: 1. Open the trunk. See Trunk on page 3‑12.
2. Remove the three fasteners from the trunk trim.
3. Pull back the trunk trim to access the bulbs.
4. Turn the bulb socket counterclockwise to
remove it.
5. Pull the bulb straight out.
6. Push the bulb straight in until it clicks.
7. Push the bulb socket in and turn it clockwise to secure it.
8. Put the trunk trim and three fasteners back into place.
6-54

License Plate Lamp
To replace one of these bulbs:1. Remove the license plate.
2. Reach up through the opening above the license plate to access the two license plate lamps.
3. Turn the socket counterclockwise to remove.
4. Grasp the bulb in the socket and pull straight out.
5. Push the bulb straight into the socket until it clicks to secure it.
6. Push the socket in and turn it clockwise to secure it.
7. Reinstall the license plate in its original location.
Replacement Bulbs
Exterior Lamps Bulb Number
Back-up Lamp 921
Sidemarker, License Plate Lamp,
and Auxiliary Taillamp 194
Stoplamp, Taillamp, and Turn
Signal Lamp 3057K
For replacement bulbs not listed here, contact your
dealer.
Windshield Wiper Blade
Replacement
Windshield wiper blades should be inspected for wear
or cracking. See
Scheduled Maintenance on page 7‑3.
It is a good idea to clean or replace the wiper blade
assembly on a regular basis or when worn. For
proper windshield wiper blade length and type, see
Maintenance Replacement Parts on page 7‑11.
To replace the wiper blade assembly: 1. Turn the ignition to ACC/ACCESSORY with the engine off.
2. Pull the windshield wiper assembly away from the windshield.
6-55

Tire Chains
{WARNING:
If your vehicle has P235/55R17, or P245/50R18
size tires, do not use tire chains. There is not
enough clearance.
Tire chains used on a vehicle without the proper
amount of clearance can cause damage to the
brakes, suspension, or other vehicle parts. The
area damaged by the tire chains could cause you
to lose control of your vehicle and you or others
may be injured in a crash.
Use another type of traction device only if its
manufacturer recommends it for use on your
vehicle and tire size combination and road(Continued)
WARNING: (Continued)
conditions. Follow that manufacturer's
instructions. To help avoid damage to your
vehicle, drive slowly, readjust or remove the
device if it is contacting your vehicle, and do not
spin your vehicle's wheels.
If you do find traction devices that will fit, install
them on the front tires.
Notice: If your vehicle has P225/60R16 size tires,
use tire chains only where legal and only when you
must. Use only SAE Class S‐type chains that are the
proper size for your tires. Install them on the front
tires and tighten them as tightly as possible with the
ends securely fastened. Drive slowly and follow the
chain manufacturer's instructions. If you can hear
the chains contacting your vehicle, stop and
retighten them. If the contact continues, slow down
until it stops. Driving too fast or spinning the wheels
with chains on will damage your vehicle.
6-80

Removing the Spare Tire and Tools
The equipment you will need is located in the trunk.1. Open the trunk. See Trunk on page 3‑12.
2. Turn the center retainer
counterclockwise to
remove it.
3. Lift and remove the compact spare tire cover.
4. Turn the retainer that secures the jack and wheel wrench counterclockwise and remove the washer.
5. Remove the jack container with the jack and the wheel wrench.
6. Remove the spare tire from the vehicle. See Compact Spare Tire on page 6‑100.
6-92

A. Center Retainer
B. Compact Spare Tire Cover
C. Retainer
D. Washer E. Jack Container F. Spare Tire
G. Wheel Wrench H. Jack I. Foam Insert
J. Bolt
1. Open the trunk. See Trunk on page 3‑12.
2. Place the foam insert (I) in the trunk compartment.
3. Reinstall the compact spare tire (F) face down. Line up the wheel center hole with the bolt (J).
Then place it on the compartment floor. 4. Insert the jack container (E) into the spare tire (F).
5. Insert the wheel wrench (G) and jack (H) into the
center of the compact spare tire making sure to
line up the wheel nut hole with the bolt (I) on the
compartment floor.
6. Secure the compact spare tire and the jack container (E) with the washer (D) and the
retainer (C).
7. Reinstall the compact spare tire cover (B).
8. Secure with the center retainer (A).
The compact spare tire is for temporary use only.
Replace the compact spare tire with a full-size tire as
soon as you can. See Compact Spare Tire
on
page 6‑100.
6-99

To reinstall the rear seat cushion, do the following:
{WARNING:
A safety belt that is not properly routed through
the seat cushion or is twisted will not provide the
protection needed in a crash. If the safety belt has
not been routed through the seat cushion at all, it(Continued)
WARNING: (Continued)
will not be there to work for the next passenger.
The person sitting in that position could be badly
injured. After reinstalling the seat cushion, always
check to be sure that the safety belts are properly
routed and are not twisted.
1. Buckle the center passenger position safety belt, then route the safety belts through the proper slots
in the seat cushion. Do not let the safety belts get
twisted.
2. Slide the rear of the cushion up and under the seatback so the rear-locating guides hook into the
wire loops on the back frame.
3. With the seat cushion lowered, push rearward and then press down on the seat cushion until the
spring locks on both ends engage.
4. Check to make sure the safety belts are properly routed and that no portion of any safety belt is
trapped under the seat. Also make sure the seat
cushion is secured.
6-114

Services Provided
.Emergency Fuel Delivery:Delivery of enough
fuel for the vehicle to get to the nearest service
station.
.Lock‐Out Service: Service is provided to unlock
the vehicle if you are locked out. A remote unlock
may be available if you have OnStar
®. For security
reasons, the driver must present identification
before this service is given.
.Emergency Tow From a Public Road or
Highway: Tow to the nearest Buick dealer for
warranty service, or if the vehicle was in a crash
and cannot be driven. Assistance is also given
when the vehicle is stuck in sand, mud, or snow.
.Flat Tire Change: Service is provided to change
a flat tire with the spare tire. The spare tire,
if equipped, must be in good condition and
properly inflated. It is the owner's responsibility for
the repair or replacement of the tire if it is not
covered by the warranty.
.Battery Jump Start: Service is provided to jump
start a dead battery.
.Trip Interruption Benefits and Assistance:
If your trip is interrupted due to a warranty failure,
incidental expenses may be reimbursed during the
5 years/100,000 miles (160 000 km) Powertrain
warranty period. Items considered are hotel,
meals, and rental car.
Services Not Included in Roadside
Assistance
.Impound towing caused by violation of any laws.
.Legal fines.
.Mounting, dismounting or changing of snow tires,
chains, or other traction devices.
.Towing or services for vehicles driven on a
non-public road or highway.
8-9