lock BUICK RIVIERA 1999 Repair Manual

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5-24
10. Lower the vehicle by turning the wheel wrench
counterclockwise. Lower the jack completely.
11. Using the wheel
wrench, tighten the
wheel nuts firmly in
a criss
-cross sequence
as shown.
CAUTION:
Incorrect wheel nuts or improperly tightened
wheel nuts can cause the wheel to become loose
and even come off. This could lead to an accident.
Be sure to use the correct wheel nuts. If you have
to replace them, be sure to get new GM original
equipment wheel nuts.
Stop somewhere as soon as you can and have
the nuts tightened with a torque wrench to
100 lb
-ft (140 N´m).

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6-6
The fuel door can also be
opened by using the release
in the trunk compartment,
on the driver's side of
the vehicle.
While refueling, hang the tethered cap in the notch on
the fuel door.
To remove the cap, turn it slowly to the left
(counterclockwise). The cap has a spring in it; if you let
go of the cap too soon, it will spring back to the right.

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6-7
CAUTION:
If you get gasoline on yourself and then
something ignites it, you could be badly burned.
Gasoline can spray out on you if you open the
fuel filler cap too quickly. This spray can happen
if your tank is nearly full, and is more likely in
hot weather. Open the fuel filler cap slowly and
wait for any ªhissº noise to stop. Then unscrew
the cap all the way.
Be careful not to spill gasoline. Clean gasoline from
painted surfaces as soon as possible. See ªCleaning the
Outside of Your Vehicleº in the Index.When you put the cap back on, turn it to the right
(clockwise) until you hear a clicking sound. Make
sure you fully install the cap. The diagnostic system
can determine if the fuel cap has been left off or
improperly installed. This would allow fuel to evaporate
into the atmosphere. See ªMalfunction Indicator Lampº
in the Index.
NOTICE:
If you need a new cap, be sure to get the right
type. Your dealer can get one for you. If you get
the wrong type, it may not fit properly. This may
cause your malfunction indicator lamp to light
and your fuel tank and emissions system may be
damaged. See ªMalfunction Indicator Lampº in
the Index.

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6-16
Remove the air cleaner assembly as follows:
1. Remove the air duct clamp and separate the hose
from the air cleaner cover. Rotate the hose on the
throttle body upward so it is out of the way.
2. Detach the electrical connector and remove the air
cleaner cover by flipping the two latches on the
bottom inboard side of the cover.
3. Tilt and pull the cover toward the engine to
disengage it from the assembly.
4. Remove the old filter and install the new one.
5. Reinstall the air cleaner cover by sliding the tabs into
the base of the air cleaner and locking the two
latches. Reinstall the electrical connector.
6. Rotate the inlet duct into position and slide it onto
the air cleaner outlet, then tighten the clamp.
Refer to the Maintenance Schedule to determine when to
replace the air filter.
See ªScheduled Maintenance Servicesº in the Index.
CAUTION:
Operating the engine with the air cleaner/filter
off can cause you or others to be burned. The air
cleaner not only cleans the air, it stops flame if
the engine backfires. If it isn't there, and the
engine backfires, you could be burned. Don't
drive with it off, and be careful working on the
engine with the air cleaner/filter off.
NOTICE:
If the air cleaner/filter is off, a backfire can cause
a damaging engine fire. And, dirt can easily get
into your engine, which will damage it. Always
have the air cleaner/filter in place when
you're driving.

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6-33
The driver's side low-beam headlamp access area
is behind and between the high
-beam area and the
air cleaner.
1. Loosen the two bolts on the inboard edge of the
headlamp assembly. This allows you to pull out
the assembly for more hand clearance when
changing bulbs.
2. Reach into the assembly
and turn the bulb socket
one
-quarter of a turn
toward the center of the
engine compartment,
while pressing it firmly.
3. Remove the wire connector from the bulb by
lifting the lock tab (B) and pulling it away from the
plastic base.
4. Install the bulb by putting the small tab (D) into the
small notch in the lamp (E).5. Turn the bulb socket one
-quarter of a turn making
sure the tab is properly engaged in the panel slot.
6. To reassemble, attach the wire connector (A) to the
plastic base making sure the lock tab (B) is over the
lock (C).
7. Replace the headlamp assembly and tighten the two
bolts on the inboard edge of the assembly.
Headlamp Aiming
Your vehicle has a headlamp system equipped with
horizontal and vertical aim indicators. The aim has been
pre
-set at the factory and should need no further
adjustment. This is true even though your vertical and
horizontal aim indicators may not fall exactly on the ª0º
(zero) marks on their scales.
If your vehicle is damaged in an accident, the headlamp
aim may be affected. Aim adjustment may be necessary
if it is difficult to see lane markers (for horizontal aim),
or if oncoming drivers flash their high beams at you (for
vertical aim). If you believe your headlamps need to be
re
-aimed, we recommend that you take it to your dealer
for service; however, it is possible for you to re
-aim
your headlamps as described in the following procedure.

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6-35
2. Turn the vertical aiming screw (C) until the level
bubble (D) is lined up with zero.
Front Turn Signal Lamps
The turn signal bulb is located in the front fascia.
1. Remove the panel on the underside of the bulb assembly
by pulling the two fasteners that hold it in place.
2. Reach in to press the locking tab and twist the bulb
socket one
-quarter of a turn counterclockwise and
pull the bulb out of the socket.
3. Replace the bulb, then reassemble by reversing Steps
1 and 2.
Taillamps/Rear Turn Signal/Back-Up
Lamps
Taillamps: A, B and C
Rear Turn Signal: A and C
Back
-Up Lamps: D
The entire taillamp assembly must be removed to
change any of these bulbs.

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6-37
3. Pull the taillamp assembly away from the vehicle
carefully, to avoid scratching the paint. The taillamp
has safety straps to help you hold the assembly while
replacing the bulbs.
The following instructions explain how to change
each bulb.1. Remove the bulb socket assembly by squeezing the
plastic lock and turning it one
-quarter of a turn
counterclockwise.

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6-59
Instrument Panel Fuse BlockFuse Usage
1 Air Bag
2 Injectors
3 Anti
-Lock Brake System
4 Left Exterior Lamps
5 Turn Signal Lamps
6 Oxygen Sensor
7 Climate Control
8 Right Exterior Lamps
9 HVAC Relay
10 MAF
11 Auxiliary Power
12 Interior Lamps
13 Chime
14 TMNSS
15 Cruise Control
16 Perimeter Lights
17 Not Used

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6-60
Fuse Usage
18 Not Used
19 Radio
20 Cooling Fan
21 Not Used
22 Not Used
23 Windshield Wipers
24 Flat Pack Motor
25 PCM
26 Cigarette Lighter
27 Crank
28 HVAC BlowerEngine Compartment Fuse Block

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6-62
To Remove the Rear Seat Cushion
1. Pull up on the front of the cushion to release the
front hooks.
2. Pull the cushion up and out toward the front of
the vehicle.
To Reinstall the Rear Seat Cushion
CAUTION:
A safety belt that isn't properly routed through
the seat cushion or is twisted won't provide the
protection needed in a crash. If the safety belt
hasn't been routed through the seat cushion at
all, it won't 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. Don't 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.