2009 CADILLAC STS climate control

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.
The climate control system uses the information
from these sensors to adjust the temperature, 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.
Do not cover the sensors or the automatic climate
control system will not work properly.
Outlet Adjustment
Use the lever located in the center of each outlet to
change the direction of the airow, either side-to-side or
up and down. Use the thumbwheels to open or close
the outlets to adjust the airow.
Turn the thumbwheel towards the vehicle door to open
the outlets and allow the maximum amount of air to
enter your vehicle. Turn the thumbwheel towards
the center console to close the outlets and minimize
the amount of air entering the vehicle.
Operation Tips

Clear away any ice, snow or leaves from the air
inlets at the base of the windshield that may
block the ow of air into your vehicle.
Use of non-GM approved hood deectors may
adversely affect the performance of the system.
Keep the path under the front seats clear of objects
to help circulate the air inside of your vehicle more
effectively.
If the airow seems low when the fan speed is at
the highest setting, the passenger compartment air
lter may need to be replaced. For more information,
seePassenger Compartment Air Filter on page 3-54.
3-52

Rear Climate Control System
The vehicle has a rear climate control system. The base
model includes air outlets in the rear of the center console
for cooling and under-seat air outlets for heating. The
temperature, amount of airow, and the air delivery mode
is controlled automatically by the front climate control
system.
Some vehicles may have an optional climate control
panel for the rear passenger, located on the back of the
center console.
A. Temperature Control
B. Air Delivery Mode
ControlC. Heated Seat
D. Heated Seat
Indicator
9(Off):Turns off the airow to the rear seat
passengers. With the air delivery off there may be an
increase in the air rush sound of the front system.Temperature Control:Turn clockwise or
counterclockwise to increase or decrease the
temperature.
Air Delivery Mode Control:Turn to change the
direction of the airow for the rear seat passengers.
To change the current mode, select one of the following:
Y(Vent):Air is directed to the console outlets.
\(Bi-Level):Air is directed to the console and the
oor outlets.
[(Floor):Air is directed to the oor outlets.
The front climate control system automatically controls
the amount of airow to the rear seat passengers,
regardless of optional equipment. Airow to the rear
system turns off when defrost is selected on the front
climate control panel, in order to direct air to clear the
windshield.
z(Heated Seat):Press to turn on rear heated seats.
There are two buttons, each with three indicator lights,
located between the climate control knobs on the rear
climate control panel.
Keep the area under the front seats clear of any objects
so the air in the vehicle can circulate effectively.
3-53

Passenger Compartment Air Filter
Your vehicle may be equipped with a passenger
compartment air lter. There are two types of lters
available. There is a standard dust lter that traps small
particles including pollen. There is, also, a dust/odor lter
available that traps dust and pollen and uses a charcoal
element to help reduce many offensive odors from
entering your vehicle. The lter will need to be changed
periodically. For information on when to change the
passenger compartment air lter, seeScheduled
Maintenance on page 6-4.
Notice:Driving without a passenger compartment
air lter in place can cause water and small particles,
like paper and leaves, to be pulled into your climate
control system which may cause damage to it. Make
sure you always replace the old lter with a new one.The access panel for the passenger compartment air
lter is located under the hood near the windshield, on the
passenger side of the vehicle. SeeEngine Compartment
Overview on page 5-12for more information on location.
SeeDoing Your Own Service Work on page 5-4for
information on doing your own service work.
To access the passenger compartment air lter:
1. Pull back the rubber hood seal from the edge of the
leaf screen vent cover.
2. Remove the three fasteners that hold the lter
cover in place and slide the cover off.
3. To access the lter, remove the water deector by
lifting the outboard edge of the deector to release
the retention tab.
3-54

BATTERY NOT CHARGING SERVICE
CHARGING SYS (System)
This symbol appears with
this message.
This message displays when a problem with the
charging system has been detected. Have your
vehicle serviced by your dealer/retailer.
BATTERY SAVER ACTIVE
This message displays when the system detects that the
battery voltage is dropping beyond a reasonable level.
The battery saver system starts reducing certain features
of the vehicle that may be noticeable. At the point that
the features are disabled, this message is displayed.
It means that the vehicle is trying to save the charge
in the battery.
Turn off all unnecessary accessories to allow the battery
to recharge.
The normal battery voltage range is 11.5 to 15.5 volts.
To monitor battery voltage on the DIC, press the
information button until BATTERY VOLTS displays.
BATTERY VOLTAGE HIGH
This symbol appears with
this message.
This message displays when the electrical charging
system is overcharging the battery. When the system
detects that the battery voltage is above an estimated
16 volts, this message displays.
To reduce the charging overload, use the vehicle’s
accessories:
Turn on the exterior lamps and radio.
Set the climate control on AUTO and the fan speed
on the highest setting.
Turn the rear window defogger on.
The normal battery voltage range is 11.5 to 15.5 volts
when the engine is running. To monitor battery voltage
on the DIC, press the information button until
BATTERY VOLTS displays.
3-80

RADAR CRUISE NOT READY
This message displays when the Adaptive Cruise
Control system is not activating due to a temporary
condition. Your vehicle does not require service.
This message also displays when either of the
following conditions occur:
The driver turns off the head-up display (HUD)
while the Adaptive Cruise Control is engaged.
The driver attempts to engage the Adaptive Cruise
Control while the HUD is off.
If this message appears when attempting to activate the
system, continue driving for several minutes and then
try activating the system again.
RIGHT REAR DOOR AJAR
This symbol appears with
this message.
This message displays when the passenger side rear
door is not closed completely. Make sure that the door is
closed completely.
SERVICE AC (Air Conditioning)
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 a drop in heating
and air conditioning efficiency is noticeable.
SERVICE AIR BAG
This message displays if there is a problem with the
airbag system. Have your vehicle serviced by your
dealer/retailer immediately. SeeAirbag Readiness
Light on page 3-58for more information.
SERVICE BRAKE ASSIST
This message displays when a problem with the panic
brake assist system has been detected. Have your
vehicle serviced by your dealer/retailer.
SERVICE LANE DEPARTURE SYSTEM
If your vehicle has the Lane Departure Warning (LDW)
system, this message may display to indicate that the
LDW system is not working properly. If this message
remains on after continued driving, the system needs
service. See your dealer/retailer. See the Index in the
Navigation manual for more information.
3-89

Blizzard Conditions
Being stuck in snow can be in a serious situation.
Stay with the vehicle unless there is help nearby.
If possible, use theRoadside Service on page 7-7.
To get help and keep everyone in the vehicle safe:
Turn on theHazard Warning Flashers on page 3-6.
Tie a red cloth to an outside mirror.
{CAUTION:
Snow can trap engine exhaust under the vehicle.
This may cause exhaust gases to get inside.
Engine exhaust contains carbon monoxide (CO)
which cannot be seen or smelled. It can cause
unconsciousness and even death.
If the vehicle is stuck in the snow:
Clear away snow from around the base of
your vehicle, especially any that is blocking
the exhaust pipe.
Check again from time to time to be sure
snow does not collect there.
CAUTION: (Continued)
CAUTION: (Continued)

Open a window about two inches on the side
of the vehicle that is away from the wind to
bring in fresh air.
Fully open the air outlets on or under the
instrument panel.
Adjust the Climate Control system to a setting
that circulates the air inside the vehicle and
set the fan speed to the highest setting.
See Climate Control System in the Index.
For more information about carbon monoxide, see
Engine Exhaust on page 2-36.
Snow can trap exhaust gases under your vehicle.
This can cause deadly CO (carbon monoxide) gas
to get inside. CO could overcome you and kill you.
You cannot see it or smell it, so you might not
know it is in your vehicle. Clear away snow from
around the base of your vehicle, especially any
that is blocking the exhaust
Run the engine for short periods only as needed to
keep warm, but be careful.
To save fuel, run the engine for only short periods as
needed to warm the vehicle and then shut the engine off
and close the window most of the way to save heat.
4-22

Uniform Tire Quality Grading
Quality grades can be found where applicable
on the tire sidewall between tread shoulder
and maximum section width. For example:
Treadwear 200 Traction AA
Temperature A
The following information relates to the system
developed by the United States National Highway
Traffic Safety Administration (NHTSA), which
grades tires by treadwear, traction, and
temperature performance. This applies only to
vehicles sold in the United States. The grades are
molded on the sidewalls of most passenger car
tires. The Uniform Tire Quality Grading (UTQG)
system does not apply to deep tread, winter-type
snow tires, space-saver, or temporary use
spare tires, tires with nominal rim diameters
of 10 to 12 inches (25 to 30 cm), or to some
limited-production tires.While the tires available on General Motors
passenger cars and light trucks may vary with
respect to these grades, they must also conform
to federal safety requirements and additional
General Motors Tire Performance Criteria (TPC)
standards.
Treadwear
The treadwear grade is a comparative rating
based on the wear rate of the tire when tested
under controlled conditions on a specied
government test course. For example, a tire
graded 150 would wear one and a half (1.5) times
as well on the government course as a tire
graded 100. The relative performance of tires
depends upon the actual conditions of their use,
however, and may depart signicantly from the
norm due to variations in driving habits, service
practices, and differences in road characteristics
and climate.
5-77

The underhood fuse block is located in the front of
the engine compartment on the passenger side of
the vehicle. SeeEngine Compartment Overview on
page 5-12for more information on location and removal
procedure for the front compartment underhood sights
shields.
To access the fuses, push in the tabs located on each
side of the fuse block cover, then lift the cover off.
Notice:Spilling liquid on any electrical components
on the vehicle may damage it. Always keep the
covers on any electrical component.
Fuses JCase Usage
ABS MTRABS Module - ABS Module -
Stabilitrak
AFS Active Front Steering
BLWR Blower Motor
FAN 1 Cooling Fan-Low Speed
FAN 2 Cooling Fan-High Speed
LPDB 1 Driver Side Rear Fuse Block
LPDB 2 Driver Side Rear Fuse Block
RPDB 1 Passenger Side Rear Fuse Block
RPDB 2 Passenger Side Rear Fuse Block
Fuses JCase Usage
SPARE Spare
SPARE Spare
STRTR Starter
Fuses Mini Usage
A/C CLTCH Air Conditioning Compressor Clutch
ABS ABS Module-Stabilitrak
ABS IGN Antilock Brake Controller
AUX OUTLET Rear Accessory Power Outlet
BRK VAC
PUMPBrake Vacuum Pump
CCP Climate Control Panel
CCP/RLY
COILSClimate Control Panel, Headlamp
Level Control, Active Cruise Control,
Relay Coils, Starter, Front Blower
ECM 1 Engine Control Module (ECM)
ECM/TCM
BATTECM, Transmission Control
Module (TCM)
ECM/TCM IGNECM, TCM, Instrument Panel
Cluster
5-125