2009 CADILLAC CTS sensor

Exterior Lighting Battery Saver
The exterior lamps turn off about 10 minutes after the
ignition is turned to LOCK/OFF, if the parking lamps
or headlamps have been left on. This protects against
draining the battery. The battery saver does not work
if the headlamps are turned on after the ignition is turned
to LOCK/OFF.
To keep the lamps on for more than 10 minutes, turn
the lamps back on with the exterior lamp control.
Instrument Panel Brightness
The knob with this symbol
is located on the instrument
panel to the left of the
steering column.
Turn the knob clockwise or counterclockwise to brighten
or dim the lights.
Turn the knob completely clockwise to turn on the
interior lamps.
Entry Lighting
The entry lighting system turns on the reading and
dome lamps and the backlighting to the exterior lamp
control, when a door is opened or if the transmitter
unlock button is pressed. If activated by the transmitter,
the lighting stays on for about 25 seconds. The entry
lighting system uses the light sensor on the instrument
panel; so it must be dark outside in order for the lamps
to turn on. The lamps turn off about 25 seconds after
the last door is closed. They dim then turn off if the
ignition key is turned to ON/RUN. They immediately
turn off if the power locks are used.
Parade Dimming
This feature does not let the instrument panel backlight
dim during daylight hours while the key is in the
ignition and the headlamps are on. Parade dimming
automatically works with the light sensor, located on top
of the dashboard. If it is dark enough outside and the
parking lamps are on, the backlight on the instrument
panel can be adjusted by turning the instrument panel
brightness knob clockwise or counterclockwise to
brighten or dim the lighting. SeeInstrument Panel
Brightness on page 3-20.
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Heated and Ventilated Seats:Press to heat or
ventilate the seat. SeeHeated and Ventilated Seats
on page 1-7.
_(Heated Windshield Washer, If Equipped):
For more information, seeWindshield Washer on
page 3-12.
Remote Start Climate Control Operation:For
vehicles with remote vehicle start feature and it is
activated, the climate control system heats and cools
the inside of the vehicle using the previous settings
of the system before the vehicle was turned off.
SeeRemote Vehicle Start on page 2-14.
The windshield defroster and/or rear window defogger
turn on if it is cold outside. If the vehicle has heated
seats, they turn on if the temperature inside the
vehicle is cooler than 54°F (12.5°C) or if the outside
temperature is cooler than 48°F (9°C).
Sensors
The solar sensor located
on the instrument panel,
near the windshield,
monitors the solar heat.
The interior temperature
sensor located on the
instrument panel to
the right of the steering
wheel, measures the
temperature of the
air inside the vehicle.
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The climate control system uses the information from
these sensors to adjust the fan speed and the air
delivery, in order to maintain the selected temperature.
The system may also supply cooler air to the side of
the vehicle facing the sun. The recirculation mode
will also be activated, as necessary.
Do not cover the sensors or the automatic climate
control system will not work properly.
Outlet Adjustment
Use the air outlets located in the center and on the side
of the instrument panel to direct the airow. Use the
thumbwheels near the air outlets to open or close off the
airow.
Operation Tips

Clear away any ice, snow, or leaves from air inlets
at the base of the windshield that could block the
ow of air into the vehicle.
Keep the path under the front seats clear of objects
to help circulate the air inside of the vehicle more
effectively.
Use of non-GM approved hood deectors can
adversely affect the performance of the system.
Check with your dealer/retailer before adding
equipment to the outside of the vehicle.
Passenger Compartment Air Filter
The passenger compartment air lter traps most of
the dust and pollen from the air entering the vehicle.
The lter will need to be changed periodically.
SeeScheduled Maintenance on page 6-4.
Using the climate control system without the passenger
air lter installed could let water or other debris enter
the system. This could cause a water leak or noises.
Make sure a new air lter is installed after removing the
old one.
The passenger compartment air lter is located under
the hood below the windshield wiper arm and the screen
on the passenger side of the vehicle. SeeEngine
Compartment Overview on page 5-14for more
information on location.
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Airbag Readiness Light
The system checks the airbag’s electrical system for
possible malfunctions. If the light stays on it indicates
there is an electrical problem. The system check
includes the airbag sensor, the pretensioners, the
airbag modules, the wiring and the crash sensing
and diagnostic module. For more information on the
airbag system, seeAirbag System on page 1-58.
The airbag readiness light
ashes for a few seconds
when the engine is
started. If the light does
not come on then, have it
xed immediately.{CAUTION:
If the airbag readiness light stays on after the
vehicle is started or comes on while driving, it
means the airbag system might not be working
properly. The airbags in the vehicle might not
inate in a crash, or they could even inate
without a crash. To help avoid injury, have the
vehicle serviced right away.
If there is a problem with the airbag system, an airbag
Driver Information Center (DIC) message can also come
on. SeeDIC Warnings and Messages on page 3-58
for more information.
3-36

Engine Oil Low Add Oil
If the vehicle has an oil level sensor, this message
displays if the oil level in the vehicle is low. Check the
oil level and correct it as necessary. You may need to let
the vehicle cool or warm up and cycle the ignition to
be sure this message clears.
This message clears itself after 10 seconds, until the
next ignition cycle. SeeEngine Oil on page 5-18
for additional information.
Engine Overheated Idle Engine
Notice:If you drive your vehicle while the engine
is overheating, severe engine damage may occur.
If an overheat warning appears on the instrument
panel cluster and/or DIC, stop the vehicle as soon as
possible. Do not increase the engine speed above
normal idling speed. SeeEngine Overheating
on page 5-37for more information.
This message displays when the engine coolant
temperature is too hot. Stop and allow the vehicle to
idle until it cools down. SeeEngine Coolant
Temperature Warning Light on page 3-41.
SeeOverheated Engine Protection Operating Mode on
page 5-39for information on driving to a safe place
in an emergency.
Engine Power Is Reduced
This message displays when the engine power is
being reduced to protect the engine from damage.
There could be several malfunctions that might cause
this message. Reduced engine power can affect
the vehicle’s ability to accelerate. If this message is on,
but there is no reduction in performance, proceed to
your destination. The performance may be reduced the
next time the vehicle is driven. The vehicle may be
driven at a reduced speed while this message is on, but
acceleration and speed may be reduced. Anytime this
message stays on, the vehicle should be taken to
your dealer/retailer for service as soon as possible.
Fuel Level Low
This message displays when the vehicle is low on fuel.
Rell the fuel tank as soon as possible. A chime may
sound when this message displays. SeeFilling the Tank
on page 5-8.
Heated Washer Fluid Wash (Washer)
Wipes Pending
If the vehicle has this feature, this message displays
when you turn on the heated windshield washer
uid system. See “Heated Windshield Washer” under
Windshield Washer on page 3-12for more information.
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Service A/C System
This message displays when the electronic sensors that
control the air conditioning and heating systems are
no longer working. Have the climate control system
serviced by your dealer/retailer if you notice a drop in
heating and air conditioning efficiency.
Service All Wheel Drive
This message displays if a problem occurs with the
All-Wheel Drive (AWD) system. The vehicle will run in
2WD. This could be caused by:
An electronics problem
An AWD system oil overheat
Worn out or overheated clutch plates
Various electrical issues
If this message appears, stop as soon as possible
and turn off the ignition for 30 seconds. Restart
the vehicle and check for the message on the DIC
display. If the message is still displayed or appears
again when you begin driving, the system needs service.
See your dealer/retailer right away.
Service Battery Charging System
This message displays when there is a problem with the
generator and battery charging systems. Driving with this
problem could drain the battery. Turn off all unnecessary
accessories. Stop and turn off the vehicle as soon as it is
safe to do so. Have the electrical system checked by your
dealer/retailer. Under certain conditions, the charging
system light may also turn on in the instrument panel
cluster. SeeCharging System Light on page 3-38for
more information.
Service Brake Assist
This message displays if there is a problem with the
brake system. The brake system warning light and the
antilock brake system (ABS) warning light may also
display on the instrument panel cluster. SeeBrake
System Warning Light on page 3-39andAntilock Brake
System (ABS) Warning Light on page 3-40for more
information. Stop as soon as possible and turn off the
vehicle. Restart the vehicle and check for the message
on the DIC display. If the message displays immediately
or again after you begin driving, the brake system
needs service. See your dealer/retailer as soon as
possible. SeeBrakes on page 5-42for more information.
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The message could display if the stability system
takes longer than usual to complete its diagnostic
checks due to driving conditions.
The message displays if an engine or vehicle related
problem has been detected and the vehicle needs
service. See your dealer/retailer.
The message turns off as soon as the conditions that
caused the message to be displayed are no longer
present.
Start Aborted By Theft Deterrent
This message displays if there is a communication
problem between the keyless access system and the
vehicle. The vehicle cannot be started when this
message displays. See your dealer/retailer for service.
Suspension Mode Sport (CTS-V Only)
This message will be displayed when sport mode is
selected using the Magnetic Ride Control button in the
center of the instrument panel. SeeMagnetic Ride
Control™ on page 4-8for more information.
Suspension Mode Tour (CTS-V Only)
This message will be displayed when touring mode
is selected using the Magnetic Ride Control button in
the center of the instrument panel. SeeMagnetic
Ride Control™ on page 4-8for more information.
Theft Attempted
This message displays if the theft-deterrent system has
detected a break-in attempt while you were away
from the vehicle. SeeTheft-Deterrent System on
page 2-26for more information.
Tighten Gas Cap
This message displays when the fuel cap has not been
fully tightened. Recheck the fuel cap to ensure that it
is on and tightened properly.
Tire Learning Active
This message displays when the Tire Pressure Monitor
System (TPMS) is re-learning the tire positions on
the vehicle. The tire positions must be re-learned after
rotating the tires or after replacing a tire or sensor.
SeeTire Inspection and Rotation on page 5-76,
Tire Pressure Monitor System on page 5-71, and
Inflation - Tire Pressure on page 5-69for more
information.
3-71

See the example following. When you end this
high-speed driving, return the tires to the cold tire
ination pressure shown on the Tire and Loading
Information label. SeeLoading the Vehicle on page 4-20
andInflation - Tire Pressure on page 5-69.
Example:
You will nd the maximum load and ination pressure
molded on the tire’s sidewall, in small letters, near
the rim ange. It will read something like this: Maximum
load 690 kg (1521 lbs) 300 kPa (44 psi) Max. Press.
For this example, you would set the ination pressure for
high-speed driving at 44 psi (300 kPa).
Tire Pressure Monitor System
The Tire Pressure Monitor System (TPMS) uses radio
and sensor technology to check tire pressure levels.
The TPMS sensors monitor the air pressure in
your vehicle’s tires and transmit tire pressure readings
to a receiver located in the vehicle.Each tire, including the spare (if provided), should be
checked monthly when cold and inated to the ination
pressure recommended by the vehicle manufacturer
on the vehicle placard or tire ination pressure label.
(If your vehicle has tires of a different size than the
size indicated on the vehicle placard or tire ination
pressure label, you should determine the proper
tire ination pressure for those tires.)
As an added safety feature, your vehicle has been
equipped with a tire pressure monitoring system (TPMS)
that illuminates a low tire pressure telltale when one
or more of your tires is signicantly under-inated.
Accordingly, when the low tire pressure telltale
illuminates, you should stop and check your tires as soon
as possible, and inate them to the proper pressure.
Driving on a signicantly under-inated tire causes the
tire to overheat and can lead to tire failure. Under-ination
also reduces fuel efficiency and tire tread life, and may
affect the vehicle’s handling and stopping ability.
Please note that the TPMS is not a substitute for proper
tire maintenance, and it is the driver’s responsibility to
maintain correct tire pressure, even if under-ination has
not reached the level to trigger illumination of the
TPMS low tire pressure telltale.
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