Page 287 of 404
2. Release tension of the wing screw clamp on the air
intake duct where it attaches to the air cleaner cover
near the top of the engine.
Turn the wing screw
counterclockwise, then detach the hose
from the air
cleaner cover.
3. To remove the air cleaner cover, push the duct and
resonator assembly rearward and up, and hold them
out
of the way.
cover and tube.
4. Reverse the instructions to replace the air cleaner
Low-Beam Headlamp Bulbs
If you need to replace a headlamp bulb, do
the following:
1. Remove the two bolts and pull out the headlamp
assembly for more hand clearance.
2. Twist the bulb assembly one-sixth of a turn
counterclockwise and pull out the bulb assembly.
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Page 288 of 404
3.
II II
Unclip the bulb
assembly from the
wiring harness and replace the
bulb assembly.
4. Reverse Steps 1 through 4 to replace the bulb
assembly, headlamp housing, air cleaner cover
and tube.
5. Replace the headlamp assembly by aligning the pin
and tightening the two bolts to secure it.
High-Beam Headlamp Bulbs
If you need to replace a headlamp bulb, do the following:
1. Remove the headlap assembly if you need more
hand clearance.
2. Pull up on the wiring harness. This unlocks the bulb.
- v-
3. Now you can reach in behind the lamp housing and
4. To replace the bulb, angle the new bulb into the
pull out
the bulb.
empty socket.
5. Push the base of the bulb down to lock it into place.
6. If you removed the headlamp assembly, reassemble
it by aligning the pin and tightening the two bolts to
secure it.
Page 289 of 404

Front Turn Signal
The turn signal bulb is on the inboard edge of the
headlamp assembly.
To replace a bulb, do the following:
1.
2.
3.
4.
Remove the headlamp assembly if you need more
hand clearance.
Reach in and press the locking tab while twisting the
bulb assembly one-quarter of a turn
counterclockwise.
Replace the bulb and reverse Step
2 to reassemble.
If you removed the headlamp assembly, reassemble
it by aligning the pin and tightening the two bolts to
secure
it.
Headlamp Aiming
Your vehicle has the composite headlamp system. These
headlamps have horizontal and vertical aim indicators.
The aim has been pre-set at the factory and should need
no further adjustment.
If your vehicle is damaged in an accident and the
headlamp aim seems
to be affected, see your Aurora
retailer. Headlamps on damaged vehicles may require
recalibration
of the horizontal aim by your Aurora retailer.
To check the aim, the vehicle should be properly
prepared as
follows:
e
0
e
The vehicle must have all four tires on a perfectly
level surface.
The vehicle should not have
any snow, ice or mud
attached to it.
There should not be any cargo or loading of the
vehicle, except it should have a full tank
of gas and
one person or
160 lbs. (75 kg) on the driver’s seat.
Tires should be properly inflated.
I NOTICE:
To make sure your headlamps are aimed
properly, read all the instructions before
beginning. Failure to
follow these instructions
could cause damage to headlamp parts.
State inspection stations will allow a vertical reading of
plus
0.76 degrees or minus 0.76 degrees from the center
of the bubble.
It is recommended that the upper limit not exceed plus
0.4 degrees from the center of the bubble. Other drivers
may flash their high beams at
you if your adjustment is
much above plus
0.4 degrees.
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Page 290 of 404
If you find that the headlamp aiming needs adjustment,
follow these steps:
Start with the vertical headlamp aim. Don't try
to adjust
the horizontal aim first. Adjustment screws can be
turned with an
E8 Torx@socket or T15 Torx screwdriver.
1. Check the vertical aim for each headlamp. The
vehicle must be on a level surface.
Turn the vertical
aiming screw until the bubble in
the level is centered
at
0 (zero).
2. Now adjust the horizontal aim. Check the horizontal
aim for each headlamp and adjust it as necessary.
Turn the horizontal aiming screw until the pointer is
lined up with the
0 (zero).
3. Now, visually re-check the vertical aim, to make
sure it is still correct after the horizontal aim
adjustment. Readjust,
if necessary.
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Page 303 of 404

Each new wheel should have the same load-carrying
capacity, diameter, width, offset and be mounted the
same way as the one it replaces.
If you need to replace any of your wheels, wheel bolts
or wheel nuts, replace them only with new
GM original
equipment parts. This way, you will be sure to have
the right wheel, wheel bolts and wheel nuts for your
Aurora model.
Using the wrong replacement wheels, wheel bolts
or wheel nuts on your vehicle can be dangerous.
It could affect the braking and handling of your
vehicle, make your tires lose air and make you
lose control.
You could have a collision in which
you or others could be injured. Always use the
correct wheel, wheel bolts and wheel nuts for replacement.
I
NOTICE:
The wrong wheel can also cause problems with
bearing life, brake cooling, speedometer or
odometer calibration, headlamp aim, bumper height, vehicle ground clearance and tire or tire
chain clearance to the body and chassis.
See “Changing a Flat Tire” in the Index for
more information.
Used Replacement Wheels
Putting
a used wheel on your vehicle is
dangerous.
You can’t know how it’s been used or
how
far it’s been driven. It could fail suddenly
and cause an accident.
If you have to replace a
wheel, use a new GM original equipment wheel.
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Page 314 of 404

Electrical System
Add-on Electrical Equipment
NOTICE:
Don’t add anything electrical to your Aurora
unless you check with your retailer first. 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 air bag system. Before attempting to
add anything electrical to your Aurora, see “Servicing
Your Air Bag-Equipped Aurora’’ in the Index.
Headlamp Wiring
The headlamp wiring is protected by a circuit breaker in
the wiring harness. An electrical overload will cause the
lamps
to go on and off, or in some cases to remain off.
If this happens, have your headlamp system checked
right away.
Windshield Wiper Fuses
The windshield wiper motor is protected by an internal
circuit breaker and a fuse in the fuse panel on the other
side of the instrument panel. 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 fixed.
Power Windows and Other Power Options
Circuit breakers in the fuse panel 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 fixed.
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Page 321 of 404
REAR COMPARTMENT
PASSENGER
SIDE FUSE BLOCK
OPEN
IS
PWR s-1-
r- DEFOG R IZ
IS I 1)
ICN 3
20
ltiN I
?h
ROSEQ
Fuse
172
3
4
5,6
7
839
10
11
12, 13
14
15
16
17
18
19
20
21
Usage
Spare
Open
Breaker
-- Power Window, Sunroof
Spare
Open
Spare
Open
Breaker
-- Power Seat
Spare
Open
Power Seat
Breaker
-- Headlamps
HVAC Blower Motor
Powertrain Control Module,
PASS-Key@II
Ignition
3
Ignition 1
Rear Defogger
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Page 324 of 404
Replacement Bulbs
OUTSIDE LAMPS BULB
Front
Front Turn Signal Lamps ............... .3 157NA
Halogen Headlamps
Low Beam
............................ 9006
HighBeam
........................... 9005
Rear
Back-up Lamps ......................... 3 155
Stop/Taillamps
.......................... 3057
Rear
Turn Signal Lamps .................. 3057
INSIDE LAMPS BULB
Overhead
Front Overhead Lamps .................... 168
Rail Courtesy/Reading Lamps
............... 168
For service information on other bulbs, contact your
Aurora retailer service department.
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