2001 CADILLAC SEVILLE sensor

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Light Sensor
The light sensor for the Daytime Running Lamps (DRL)
and the Twilight Sentinel is located on the driver's side
of the front defogger grille. If you cover the sensor, it
will read ªdarkº and the lamps will come on.
Exterior Lighting Battery Saver
If the manual parking lamps or headlamps have been
left on, the exterior lamps will turn off approximately
ten minutes after the ignition is turned to OFF.
This protects against draining the battery in case you
have accidentally left the headlamps or parking lamps
on. The battery saver does not work if the headlamps
are turned on after the ignition switch is turned to OFF.
If you need to leave the lamps on for more than
10 minutes, use the exterior lamps control knob to
turn the lamps back on. To delay the lamps from
turning off, see ªTwilight Sentinelº in the Index.

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Illuminated Entry
The illuminated entry system turns on the courtesy
lamps and the backlighting to the driver's door switches
and to the ignition key when a door is opened or if you
press the Remote Keyless Entry (RKE) transmitter
unlock button. The illuminated entry system works with
the light sensor and it must be dark outside in order for
the courtesy lamps or backlighting to turn on. The
courtesy lamps turn off approximately 25 seconds after
the last door is closed or after the ignition key is turned
to ON or if the RKE transmitter lock button is pressed.
The courtesy lamps turn off approximately 40 seconds
after the doors are unlocked with the RKE transmitter if
no door is opened.
Parade Dimming
This feature prohibits the dimming of the instrument
panel lights during daylight while the parking lamps are
on. This feature works with the light sensor and is fully
automatic. When the light sensor reads darkness outside,
the instrument panel lights can be adjusted by following
the steps under ªInstrument Panel Intensity/Brightness
Control.º Backlighting to the instrument panel will also
turn on.
Reading Lamps
The reading lamps are located in the roof. These lamps
and the interior courtesy lamps come on when any door
is opened and it is dark outside. The rear lamps come on
when a rear door is opened. Press the button near the
lamps to turn them on and off.
If the reading lamps are left on, they automatically shut
off 10 minutes after the ignition has been turned off.
Battery Load Management
The battery load management feature is designed to
monitor the vehicle's electrical load and determine when
the battery is in a heavy discharge condition. During
times of high electrical loading, the engine may idle at a
higher revolutions per minute (rpm) setting than normal
to make sure the battery charges. High electrical loads
may occur when several of the following are on:
headlamps, high beams, fog lamps, rear window
defogger, high blower fan, heated seats and engine
cooling fans.

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If the battery continues to discharge, even with the
engine idling at a higher rpm setting, some electrical
loads will automatically be reduced. When this occurs,
the rear window defogger may take slightly longer to
clear the glass, the heated seats may not get as warm as
they usually do and the fan blower may cut back to a
lower speed. For more battery saving information, see
ªBattery Saver Active Messageº in the Index.
Inadvertent Power Battery Saver
This feature is designed to protect your vehicle's battery
against drainage from the interior lamps, trunk lamp,
glove box lamp, cigarette lighters or the garage door
opener. When the ignition is turned off, the power to
these features will automatically turn off after
10 minutes. Power will be restored for an additional
10 minutes if any door is opened, the trunk is opened
or the courtesy lamp switch is turned on.
Mirrors
Electrochromic Day/Night Rearview Mirror
with Compass
Your vehicle has an electrochromic inside rearview
mirror with a compass. Your vehicle's mirror also
contains OnStar

controls and may contain passenger
airbag ON and OFF indicators for the Automatic
Occupant Sensor (AOS) System (If Equipped). For
more information about these features, see ªOnStarº and
ªAutomatic Occupant Sensor Systemºin the Index.

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Air Bag Readiness Light
There is an air bag readiness light on the instrument
panel, which shows AIR BAG (United States) or the air
bag symbol (Canada). The system checks the air bag's
electrical system for malfunctions. The light tells you if
there is an electrical problem. The system check
includes the air bag sensors, the air bag modules, the
wiring and the crash sensing and diagnostic module.
For more information on the air bag system, see ªAir
Bagº in the Index.
United States Canada
This light will come on when you start your vehicle, and
it will flash for a few seconds. Then the light should go
out. This means the system is ready.If the air bag readiness light stays on after you start the
vehicle or comes on when you are driving, your air bag
system may not work properly. Have your vehicle
serviced right away.
CAUTION:
If the air bag readiness light stays on after you
start your vehicle, it means the air bag system
may not be working properly. The air bags in
your vehicle may not inflate in a crash, or they
could even inflate without a crash. To help avoid
injury to yourself or others, have your vehicle
serviced right away if the air bag readiness light
stays on after you start your vehicle.
The air bag readiness light should flash for a few
seconds when you turn the ignition key to ON. If the
light doesn't come on then, have it fixed so it will be
ready to warn you if there is a problem.

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Passenger Air Bag On/Off Lights
(If Equipped)
United States Canada
If your vehicle is equipped with the Automatic
Occupant Sensor (AOS) system, when the key is turned
to ON or START, the passenger air bag ON/OFF lights
will come on for five seconds as a check. After five
seconds, either the OFF light or the ON light will stay
on to let you know if the right front passenger's frontal
and side impact air bags are off or on. See ªAutomatic
Occupant Sensor (AOS) Systemº in the Index for more
on this, including important safety information.If, after five seconds, one of the lights does not go out or
if there are no lights at all, there is a problem with the
lights. There may also be a problem with the lights if
they both don't come on as a check. See your dealer
for service.
United States Canada
If the OFF light appears, it means that the AOS system
has turned off the right front passenger's frontal and side
impact air bags.

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BATTERY VOLTAGE LOW - 6: This message will
appear when the electrical system is charging less than
10.5 volts or if the battery has been drained. If this
message appears immediately after starting, it is possible
that the generator can still recharge the battery. The
battery should recharge while driving but may take a
few hours to do so. Consider using an auxiliary charger
(be sure to follow the manufacturer's instructions) to
boost the battery after returning home or to a final
destination. If this message appears while driving or
after starting your vehicle and stays on, have it checked
immediately to determine the cause of this problem.
To help the generator recharge the battery quickly, you
can reduce the load on the electrical system by turning
off the accessories. You can monitor battery voltage on
the DIC by pressing the INFO button. The normal
range is 11.5 to 15.5 volts.
CHANGE BRAKE PADS
- 125: This message is used
to notify you that the brake pads may have worn down.
A sensor is connected to the brake pads and is triggered
when they wear to a certain point. Have the front and
rear brakes serviced by your dealer as soon as possible.CHANGE ENGINE OIL
- 82: This means that the
life of the engine oil has expired and it should be
changed within 200 miles. See ªEngine Oilº and ªFilter
Recommendationsº in the Maintenance Schedule
booklet. After an oil change, the Oil Life Indicator must
be reset. See ªOil Life Indicator, How to Resetº in
the Index.
CHANGE TRANS FLUID
- 47: This message will
appear when it is time to replace the transaxle fluid.
See the Maintenance Schedule booklet for the proper
fluid and change intervals.
CHECK BRAKE FLUID
- 37: This message will
display if the ignition is in ON to inform the driver that
the brake fluid level is low. Have the brake system
serviced by a technician as soon as possible. See ªBrake
System Warning Lightº in the Index.
CHECK COOLANT LEVEL
- 2: This message
will appear when there is a low level of engine coolant.
Have the cooling system serviced by a technician as
soon as possible.

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PASSENGER DOOR AJAR - 141: The passenger's
door is open or ajar when this message appears.
The ignition must be in ON and the transaxle not in
PARK (P) for this message to display. A chime will
also sound when the vehicle's speed is greater
than 3 mph (4.8 km/h).
RIGHT REAR DOOR AJAR
- 143: The right
rear door is open or ajar when this message appears.
The ignition must be in ON and the transaxle not in
PARK (P) for this message to display. A chime will
also sound when the vehicle's speed is greater
than 3 mph (4.8 km/h).
SERVICE AC SYSTEM
- 14: This message appears
when the electronic sensors that control the air
conditioning and heating systems are no longer working.
Have the climate control system serviced if you notice a
drop in heating and air conditioning efficiency.
SERVICE AIR BAG
- 83: There is a problem with the
supplemental inflatable restraint (air bag) system when
this message appears. Let only a qualified technician
work on your vehicle. See your dealership for service
at once.SERVICE CHARGING SYS
- 102: This message
will display when a problem with the charging system
has been detected. Have your vehicle serviced at
your dealership.
SERVICE ELECTRICAL SYS
- 106: This message
will display if an electrical problem has occurred within
the Powertrain Control Module (PCM) or the ignition
switch. Have your vehicle serviced by your dealership.
SERVICE FUEL SYSTEM
- 101: The Powertrain
Control Module (PCM) has detected a problem within
the fuel system when this message appears. See your
dealership for service.
SERVICE IDLE CONTROL
- 107: A problem with
the idle control has occurred when this message displays.
Take your vehicle to your dealership for service.
SERVICE STABILITY SYS
- 54: If you ever see
the SERVICE STABILITY SYS message, it means
there may be a problem with your stability enhancement
system. If you see this message, try to reset the system
(stop; turn off the engine; then start the engine again).
If the SERVICE STABILITY SYS message still
comes on, it means there is a problem. You should see
your dealer for service. Reduce your speed and drive
accordingly. A single chime will also sound when this
message is displayed.

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Comfort Controls and Radio
System Personalization
These features allow both drivers to personalize their
own climate control settings as well as their radio
settings. For more information, see ªClimate Control
Personalizationº and ªRadio Personalizationº in
the Index.
The outside temperature is always available for display
if it has been selected for a DIC display when your
vehicle is running unless an overriding DIC message
appears. You can change the temperature from
Fahrenheit to Celsius by pressing the ENG/MET
(English/metric) button on the instrument panel.
For more information on the DIC, see ªDIC Messagesº
in the Index.The electronic sensor can be affected by road or engine
heat during idling, slow driving or when the engine is
first started after a short trip. To ensure proper automatic
climate control operation, the outside air temperature
display may not update as quickly as expected. This is to
allow the air surrounding the outside temperature sensor
to be as close to the actual outside conditions as
possible. This is determined by how much time has
elapsed since the vehicle has been turned off and by
vehicle speed.
Continuous Variable Road Sensing
Suspension (CVRSS) - STS Only
The CVRSS automatically adjusts the ride of your
vehicle. Automatic ride control is achieved through a
computer used to control and monitor the suspension
system. The controller receives input from various
sensors to determine the proper system response. If the
controller detects a problem within the system, the DIC
will display a SERVICE SUSPENSION SYS message.
If this message appears, have your vehicle serviced at
your dealership.