2002 CADILLAC SEVILLE sensor

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Ultrasonic Rear Parking Assist (URPA)
Ultrasonic Rear Parking Assist can help you to determine
how close an object is to your rear bumper within a given
area, making parking easier.
The URPA display is located inside the vehicle, above the
rear window. It has three color
-coded lights that can be
seen through the rearview mirror or by turning around.
How the System Works
URPA comes on automatically when the shift lever is
moved into REVERSE (R) and the vehicle speed is
less than 3 MPH (5 km/h). When the system comes on,
the three lights on the display will illuminate to let you
know that the system is working. URPA senses how
close your vehicle is to an object. The distance is
determined by the four ultrasonic sensors located on
the rear bumper. When you shift into REVERSE (R) and an object is
detected, the following will occur in sequence
depending on the distance from the object:

At 5 feet (1.5 m) one amber light will be lit;

at 40 inches (1.0 m) both amber lights will be lit;

at 20 inches (0.5 m) a continuous chime will sound
and all three lights (amber/amber/red) will be lit; and

at 1 foot (0.3 m) a continuous chime will sound and
all three lights (amber/amber/red) will flash.
URPA can detect objects 3 inches (7.6 cm) and wider,
and at least 10 inches (25.4 cm) tall, but it cannot
detect objects that are above trunk level. In order for
the rear sensors to recognize an object, it must be within
operating range.

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If the URPA system is not functioning properly, the
display will flash red, indicating that there is a problem.
The light will also flash red while driving if a trailer is
attached to your vehicle, or a bicycle or object is on
the back of, or hanging out of your trunk. The light
will continue to flash until the trailer or the object is
removed and your vehicle is driven forward at least
15 mph (25 km/h).
It may also flash red if the ultrasonic sensors are not
kept clean. So be sure to keep your rear bumper free
of mud, dirt, snow, ice and slush or materials such as
paint or the system may not work properly. If after
cleaning the rear bumper and driving forward at least
15 mph (25 km/h), the display continues to flash red,
see your dealer. For cleaning instructions, see ªCleaning,
Outside of Your Vehicleº in the Index.It may also flash red if your vehicle is moving in
REVERSE (R) at a speed greater than 3 mph (5 km/h).
Other conditions that may affect system performance
include things like the vibrations from a jackhammer or
the compression of air brakes on a very large truck.
As always, drivers should use care when backing up a
vehicle. Always look behind you, being sure to check
for other vehicles, obstructions and blind spots.

3-4
(Recirculation): Press this button to limit the
amount of outside air entering your vehicle. This is
helpful when you are trying to cool the air quickly or
limit odors entering your vehicle. Press this button again
to turn off the recirculation feature.
If you notice the windows fogging, press the
recirculation button to exit the recirculation mode.
Recirculation is not available in the defrost mode.
A/C (Air Conditioning): Press this button to turn the
air conditioning compressor on and off. The system will
cool and dehumidify the air inside the vehicle.
When the compressor is off, A/C OFF appears on the
climate control panel display. Press the button again and
the compressor will turn back on.
The A/C OFF feature is not available in the
defrost mode.
AUTO (Automatic): The AUTO button will turn on the
system and automatically adjust the fan speed, air
delivery mode and temperature to your previously
programmed settings.When the system is set for automatic operation, sensors
will control the air delivery mode. Air will come from
the floor ducts, the instrument panel or windshield
outlets. The fan speed will vary as the system maintains
the selected temperature setting.
To find your comfort zone, start with the 75
F (24
C)
setting and allow about 30 minutes for the system to
regulate. Turn the TEMP knob to adjust the temperature if
necessary. If you choose 60
F (16
C), the system will
remain at that maximum cooling setting and will not
regulate fan speed. If you choose 90
F (32
C), the system
will remain at that maximum heating setting and will not
regulate fan speed. Choosing either maximum setting will
not cause the system to heat or cool any faster.
With the automatic setting, the air conditioning
compressor cycles on and off when needed to cool the
air. In cold weather, when the system senses the need for
heat, the airflow will be directed out the floor ducts. As
the interior temperature approaches a desired setting, the
fan speed will decrease. To maintain interior comfort,
the airflow may move to the instrument panel air outlets
and floor ducts. On bright sunny days in cold weather,
the airflow may come out of the instrument panel outlets
to maintain comfort and prevent stuffiness.

3-5
If your vehicle is sitting in direct sunlight on a hot day
and you have the climate control system in AUTO, the
air will first flow out the floor ducts for a few seconds.
This is normal. This removes hot air from the air outlets.
As the air is cooled, the airflow will enter the vehicle
through the instrument panel outlets.
To avoid blowing cold air in cold weather, the system
will start at a reduced fan speed until warm air is
available. The length time required for this to happen
depends on the outside air temperature, engine coolant
temperature or the time since the engine was last started.
As the coolant warms up, the fan speed will gradually
increase and air will flow from the floor ducts, with
some airflow to the windshield to prevent fogging under
most normal conditions. If you select defrost mode or a
fan speed manually, this function will be canceled.
If you leave your vehicle, the system will remember
the control setting the next time you start your engine,
except for recirculation and defrost. Each ignition cycle
cancels recirculation. Defrost will change to automatic
operation when the ignition is shut off and then turned
back on.Electronic Solar Sensor
The sensor monitors the sun's solar radiation and is located
near the end of the instrument panel near the windshield.
The climate control panel uses this information to
automatically make the necessary temperature and
airflow adjustments to maintain your comfort. The
climate control system may supply cooler air to one side
of your vehicle, if that side is facing the sun.
Be sure not to put anything over the electronic solar
sensor. If you do, the climate control system may not
function properly.

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Engine Air Cleaner/Filter
The engine air cleaner/filter is located next to the
coolant surge tank on the driver's side of the vehicle.
See ªEngine Compartment Overviewº in the Index for
more information on location. Be sure the engine has
cooled before following these steps to replace the engine
air cleaner/filter:
1. Loosen the air duct
clamp, which is located
at the mass airflow
sensor end of the
air duct.
2. Disconnect the air duct from the mass airflow sensor.

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Follow these steps to reinstall the engine air
cleaner/filter assembly:
1. Slide the cover into the slots in the bottom of
the base.
2. Close the cover and make sure that both latches are
secure and fully engaged.
3. Reinstall the clean air duct over the mass airflow
sensor. Make sure that the duct is secure around the
entire outer edge of the sensor.
4. Tighten the air duct 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.

6-32 Brake Wear
Your vehicle has four-wheel disc brakes.
Disc brake pads have built
-in wear indicators that make
a high
-pitched warning sound when the brake pads
are worn and new pads are needed. The sound may
come and go or be heard all the time your vehicle is
moving (except when you are pushing on the brake
pedal firmly).
CAUTION:
The brake wear warning sound means that soon
your brakes won't work well. That could lead to
an accident. When you hear the brake wear
warning sound, have your vehicle serviced.
Your vehicle also has electronic wear sensors that let
you know when the brake pads are significantly worn
and new pads are needed. The CHANGE BRAKE
PADS message will be displayed on the Driver
Information Center when the brake pads are worn and
need to be replaced. See ªChange Brake Pads Messageº
in the Index.
CAUTION:
The CHANGE BRAKE PADS message or the
high
-pitched warning sound means that soon
your brakes won't work well. That could lead
to an accident. When the CHANGE BRAKE
PADS message comes on and stays on, have your
vehicle serviced.
NOTICE:
Continuing to drive with worn-out brake pads
could result in costly brake repair.
Some driving conditions or climates may cause a brake
squeal when the brakes are first applied or lightly
applied. This does not mean something is wrong with
your brakes.

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When to Check
Check your tires once a month or more.
Don't forget your compact spare tire. It should be
at 60 psi (420 kPa).
How to Check
Use a good quality pocket
-type gage to check tire
pressure. You can't tell if your tires are properly inflated
simply by looking at them. Radial tires may look
properly inflated even when they're underinflated.
Be sure to put the valve caps back on the valve
stems. They help prevent leaks by keeping out dirt
and moisture.
Tire Pressure Monitor (TPM) System
(If Equipped)
The Tire Pressure Monitor (TPM) system uses radio and
sensor technology to check tire pressure levels. Sensors,
mounted on each road wheel, transmit tire pressure
readings to a receiver located in the trunk. Tire pressure
status and tire pressure warnings are shown on the
Driver Information Center (DIC) display. See ªDriver
Information Center (DIC)º in the Index, for details
regarding DIC controls and displays.
The system operates on a radio frequency subject to
Federal Communications Commission (FCC) Rules and
with Industry and Science Canada.
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference,
and (2) this device must accept any interference
received, including interference that may cause
undesired operation.