light OLDSMOBILE AURORA 1999 Service Manual

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2-71 Malfunction Indicator Lamp
(Service Engine Soon Light)
Your vehicle is equipped
with a computer which
monitors operation of the
fuel, ignition and emission
control systems.
This system is called OBD II (On
-Board
Diagnostics
-Second Generation) and is intended to
assure that emissions are at acceptable levels for the life
of the vehicle, helping to produce a cleaner
environment. The SERVICE ENGINE SOON light
comes on to indicate that there is a problem and service
is required. Malfunctions often will be indicated by the
system before any problem is apparent. This may
prevent more serious damage to your vehicle. This
system is also designed to assist your service technician
in correctly diagnosing any malfunction.
NOTICE:
If you keep driving your vehicle with this light
on, after a while, your emission controls may not
work as well, your fuel economy may not be as
good and your engine may not run as smoothly.
This could lead to costly repairs that may not be
covered by your warranty.
NOTICE:
Modifications made to the engine, transaxle,
exhaust or fuel system of your vehicle or the
replacement of the original tires with other than
those of the same Tire Performance Criteria
(TPC) can affect your vehicle's emission controls
and may cause the SERVICE ENGINE SOON
light to come on. Modifications to these systems
could lead to costly repairs not covered by your
warranty. This may also result in a failure to pass
a required Emission Inspection/Maintenance test.
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2-72
This light should come on, as a check to show you it is
working, when the ignition is on and the engine is not
running. If the light doesn't come on, have it repaired.
This light will also come on during a malfunction in one
of two ways:

Light Flashing
-- A misfire condition has been
detected. A misfire increases vehicle emissions and
may damage the emission control system on your
vehicle. Dealer or qualified service center diagnosis
and service may be required.

Light On Steady
-- An emission control system
malfunction has been detected on your vehicle.
Dealer or qualified service center diagnosis and
service may be required.
If the Light Is Flashing
The following may prevent more serious damage to
your vehicle:

Reducing vehicle speed.

Avoiding hard accelerations.

Avoiding steep uphill grades.

If you are towing a trailer, reduce the amount of
cargo being hauled as soon as it is possible.If the light stops flashing and remains on steady, see ªIf
the Light Is On Steadyº following.
If the light continues to flash, when it is safe to do so,
stop the vehicle. Find a safe place to park your vehicle.
Turn the key off, wait at least 10 seconds and restart the
engine. If the light remains on steady, see ªIf the Light
Is On Steadyº following. If the light is still flashing,
follow the previous steps, and drive the vehicle to your
dealer or qualified service center for service.
If the Light Is On Steady
You may be able to correct the emission system
malfunction by considering the following:
Did you recently put fuel into your vehicle?
If so, reinstall the fuel cap, making sure to fully install
the cap. See ªFilling Your Tankº in the Index. The
diagnostic system can determine if the fuel cap has been
left off or improperly installed. A loose or missing fuel
cap will allow fuel to evaporate into the atmosphere. A
few driving trips with the cap properly installed should
turn the light off.
Did you just drive through a deep puddle of water?
If so, your electrical system may be wet. The condition
will usually be corrected when the electrical system
dries out. A few driving trips should turn the light off.
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2-73
Are you low on fuel?
As your engine starts to run out of fuel, your engine may
not run as efficiently as designed since small amounts of
air are sucked into the fuel line causing a misfire. The
system can detect this. Adding fuel should correct this
condition. Make sure to install the fuel cap properly. See
ªFilling Your Tankº in the Index. It will take a few
driving trips to turn the light off.
Have you recently changed brands of fuel?
If so, be sure to fuel your vehicle with quality fuel (see
ªFuelº in the Index). Poor fuel quality will cause your
engine not to run as efficiently as designed. You may
notice this as stalling after start
-up, stalling when you put
the vehicle into gear, misfiring, hesitation on acceleration
or stumbling on acceleration. (These conditions may go
away once the engine is warmed up.) This will be detected
by the system and cause the light to turn on.
If you experience one or more of these conditions,
change the fuel brand you use. It will require at least one
full tank of the proper fuel to turn the light off.
If none of the above steps have made the light turn off,
have your dealer or qualified service center check the
vehicle. Your dealer has the proper test equipment and
diagnostic tools to fix any mechanical or electrical
problems that may have developed.
Oil Pressure Warning Light
If you have a problem with
your oil, this light may stay
on after you start your
engine, or come on when
you are driving.
A warning chime and the message LOW OIL
PRESSURE may also come on.
These indicate that oil is not going through your engine
quickly enough to keep it cool. The engine could be low
on oil, or could have some other oil problem. Have it
fixed right away.
The oil light could also come on briefly when the
ignition is on but the engine is not running. The light
will come on as a test to show you it is working, but the
light will go out when you turn the ignition to START. If
it doesn't come on with the ignition on, you may have a
problem with the fuse or bulb. Have it fixed right away.
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2-74
CAUTION:
Don't keep driving if the oil pressure is low. If
you do, your engine can become so hot that it
catches fire. You or others could be burned.
Check your oil as soon as possible and have your
vehicle serviced.
NOTICE:
Damage to your engine from neglected oil
problems can be costly and is not covered by
your warranty.
Cruise Light
The CRUISE light comes
on whenever you set your
cruise control. See ªCruise
Controlº in the Index.
Fuel Gage
When the ignition is on,
your fuel gage tells you
about how much fuel you
have left.
When you have less than 3.0 gallons (11.3 L) of fuel
remaining, the message LOW FUEL will be displayed and
a chime will sound. You need to get more fuel right away.
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3-2
Comfort Controls
This section tells you how to operate your climate
control system. Your climate control system uses
ozone
-friendly R-134a refrigerant.
Automatic Electronic Climate Control
Your vehicle is equipped with a Dual Zone Automatic
Electronic Climate Control System. You can use the
automatic setting or override the automatic setting by
using the manual controls. Your vehicle also has the
flow
-through ventilation system described later in
this section.If the display ever starts flashing after the automatic
electronic climate control system is started, there is a
problem with the electronic climate control system and
you should see your dealer for service.
AUTO
-PUSH Knob
By pressing the AUTO
-PUSH knob, you have selected
the electronic climate control system to be in the
automatic mode. The climate control system will
automatically control the air temperature, air distribution
and the fan speed based on the temperature inside the
vehicle, the outside temperature and the sun load.

Press the AUTO
-PUSH knob. The lights on the
AUTO
-PUSH and the AUTO FAN knobs will
illuminate. Your current comfort setting will be
shown in the digital display.

Set the comfort level you want inside the vehicle by
using the colored buttons located below the climate
control display.

Turning the AUTO
-PUSH knob selects manual
air delivery mode operation of the climate
control system.
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3-3
Temperature Buttons
To adjust the comfort level you want maintained inside
the vehicle, use the red and blue buttons located below
the digital display. If you want a warmer comfort level,
push the red button. If you want a cooler comfort level,
push the blue button. Your selected comfort setting will
be displayed on the digital screen for five seconds, then
the outside temperature will be displayed.
Mode Control
Turn the AUTO
-PUSH knob to deliver air through the
floor, upper or windshield outlets. The system will stay
in the selected mode until the AUTO
-PUSH knob
is pressed.
AUTO FAN Knob
This knob controls the fan speed in either an automatic
mode or a manual mode.

Pressing the AUTO FAN knob puts the fan control in
the automatic mode. The AUTO FAN light will
appear below the knob. The fan speed indicators will
not be illuminated when the system is in the
automatic fan control mode.
Turning the AUTO FAN knob selects a manual fan
speed. Turn this knob clockwise to raise the fan
speed. Turn this knob counterclockwise to lower the
fan speed. Turning the AUTO FAN knob overrides
the automatic fan control mode. The fan speed
indicators will be illuminated while in the manual
fan control mode.
Automatic Operation
Press the AUTO
-PUSH knob when you want the system
to automatically adjust the interior temperature to your
preference. When the system is set for automatic
operation, air will come from the floor, the upper outlets
or the windshield outlets depending on the temperature
inside the vehicle, the outside temperature and the sun
load. Fan speed will vary as the system reaches and
maintains the comfort setting you have selected.
To find your comfort setting, start with the system in
automatic mode by pressing the AUTO
-PUSH knob.
Adjust the comfort setting by using the red and blue
buttons located below the digital display until you reach
a setting of 75F (24C) on the display. Give the vehicle
about 20 minutes to stabilize and then readjust the
comfort setting if necessary. The display will show the
comfort setting for five seconds and then it will show
the outside temperature.
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3-4
In cold weather, the system will delay turning on the fan
to avoid blowing cold air. The length of the delay
depends on the engine coolant temperature and the
outside temperature. Turning the AUTO FAN knob will
override this delay by turning off the automatic fan
mode and changing the fan speed.
Your automatic electronic climate control system has
two sun sensors located on the top of the instrument
panel that detect direct sunlight. To keep you and your
passengers comfortable, the system may supply cooler
air to the side toward the sun. Be careful not to put
anything over these sun sensors. The automatic
electronic climate control system may not operate
correctly if these sensors are covered.To change the automatic electronic climate control
display from an English display to a metric display, push
the OFF button located in the Driver Information Center
(DIC) for two seconds. The display in the DIC will also
change from an English to a metric display. To return to
an English display, repeat the above procedure.
Manual Operation
You may override the automatic airflow distribution by
turning the AUTO
-PUSH knob. After you turn this
knob, the comfort setting will be displayed for five
seconds, then the outside temperature will be displayed.
The fan control will remain in the automatic control
mode unless you turn the AUTO FAN knob to select a
manual fan speed.
UPPER: This setting directs airflow through the
upper air outlets located in the instrument panel and
door panels.
BI-LEVEL: This setting directs the airflow
through both the upper air outlets and the lower floor
outlets. There is also a small amount of air directed to
the front defroster and the side window defrosters.
HEAT: This setting directs most of the airflow to
the lower floor outlets with some airflow directed to the
side window defrosters. There is also a small amount of
airflow directed to the front defroster.
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3-5
DEFOG: This setting directs the majority of the
airflow to the lower floor outlets and the front defroster.
A small amount of airflow is directed to the side
window defroster outlets. This mode can be useful to
remove the moisture from the inside of the windshield
when the outside temperature is cold or the humidity
is high.
DEF (Defrost): This setting directs the majority
of the airflow to the windshield with some airflow to
the side window defrosters and lower floor outlets.
To increase the fan speed, turn the AUTO FAN
knob clockwise.
RECIRC ON: Press this button to limit the amount of
outside air entering your vehicle. This is helpful when
you are trying to cool the interior of the vehicle quickly
or limit the amount of outside air entering your vehicle
for some other reason. The RECIRC ON button and the
AUTO
-PUSH knob may be selected at the same time.
The system will remain in RECIRC ON until the
ignition is turned off, then the system will return back to
the previously selected mode. RECIRC ON may be
selected in all manual airflow modes except
front defrost.Operating the RECIRC ON mode in cold temperatures
or under high humidity conditions may cause moisture
to form on the inside of the windshield. If this condition
occurs, deselect the RECIRC ON button.
A/C ON: Press this button to turn the air conditioning
on and off. If the system is operating in the automatic
mode, the A/C ON indicator light will automatically
illuminate. In the auto mode, the A/C compressor will
only operate when the system determines it is needed.
OFF: Turn the AUTO
-PUSH knob to OFF. Turning the
system off will cause the fan to turn off and the airflow
to be directed out the lower floor outlets. The system
will still try to keep the interior of the vehicle at the
previously chosen comfort setting. The outside
temperature will show in the display when the system is
set to OFF.
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3-6 Air Conditioning
The air conditioner cools, dehumidifies and filters the
air for the inside of the vehicle.
The air conditioning compressor is enabled in all modes
unless the A/C ON button is in the off position (the
indicator light will not be illuminated). However, the air
conditioning compressor will not operate when the
outside temperature is below 42
F (7
C). When the air
conditioner is on, you may sometimes notice slight
changes in your vehicle's engine speed and power. This
is normal, because the system is designed to cycle the
compressor on and off to keep the desired cooling and
help fuel economy.
On very hot days, open the windows long enough to let
the hot air out. This reduces the time required to cool the
interior of the vehicle to a comfortable level. If the
system is in the automatic mode (AUTO
-PUSH knob
indicator light is on), during very hot days the system
will automatically go to the RECIRC ON mode and the
temperature door will be positioned at the full cold
position for maximum cooling. You can choose the
extreme comfort setting of 60
F (16
C), but the
system will not cool any faster by choosing the extreme
comfort setting.
Heating
In cold weather, if the automatic mode is selected
(AUTO
-PUSH knob indicator light is on), the system
will automatically direct the airflow out of the lower
floor outlets and the temperature door will be positioned
at the full hot position. You can choose the extreme
comfort setting of 90
F (32
C), but the system will not
warm up any faster by selecting the extreme
comfort setting.
In cold weather, the system will delay turning on the fan
to avoid blowing cold air. The length of the delay
depends on the engine coolant temperature and the
outside temperature. The fan speed will increase as the
temperature of the engine coolant increases. Turning the
AUTO FAN knob will override this delay by turning off
the automatic fan control mode and changing the
fan speed.
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3-7 Defogging and Defrosting
On cool, humid days, use the defog setting to keep the
windows clear while also providing heat through the
lower outlets. Turn the AUTO
-PUSH knob clockwise to
DEF to quickly remove fog or ice from the windshield.
Rear Window Defogger
R. DEFOG: Press this
button to warm the defogger
grid on the rear window. An
indicator light below the
button will glow while the
rear window defogger
is operating.
At speeds above 30 mph (48 km/h), the rear defogger
will stay on until you press the R. DEFOG button again.
At speeds below 30 mph (48 km/h), the rear window
defogger will turn off automatically after about
10 minutes of use. If you press it again, the defogger
will operate for about five minutes only. You can also
turn the defogger off by turning off the ignition.
Do not attach a temporary vehicle license across the
defogger grid on the rear window.
When you operate the rear window defogger,
the outside rearview mirrors are also heated to help
remove ice and fog.
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