2009 CADILLAC STS ECU

In addition, your vehicle has a passenger sensing
system for the right front passenger’s position, which
includes sensors that are part of the passenger’s
seat. The passenger sensing system may not
operate properly if the original seat trim is replaced
with non-GM covers, upholstery or trim, or with GM
covers, upholstery or trim designed for a different
vehicle. Any object, such as an aftermarket seat
heater or a comfort enhancing pad or device,
installed under or on top of the seat fabric, could also
interfere with the operation of the passenger sensing
system. This could either prevent proper deployment
of the passenger airbag(s) or prevent the passenger
sensing system from properly turning off the
passenger airbag(s). SeePassenger Sensing
System on page 1-59.
If you have any questions about this, you should
contact Customer Assistance before you modify
your vehicle. The phone numbers and addresses
for Customer Assistance are in Step Two of
the Customer Satisfaction Procedure in this manual.
SeeCustomer Satisfaction Procedure on page 7-2.Q:Because I have a disability, I have to get my
vehicle modied. How can I nd out whether this
will affect my airbag system?
A:If you have questions, call Customer Assistance.
The phone numbers and addresses for Customer
Assistance are in Step Two of the Customer
Satisfaction Procedure in this manual. See
Customer Satisfaction Procedure on page 7-2.
In addition, your dealer/retailer and the service manual
have information about the location of the airbag
sensors, sensing and diagnostic module and airbag
wiring.
1-65

Keys...............................................................2-3
Keyless Access System...................................2-4
Keyless Access System Operation....................2-5
Remote Vehicle Start....................................2-11
Doors and Locks............................................2-13
Door Locks..................................................2-13
Power Door Locks........................................2-13
Programmable Automatic Door Locks..............2-14
Rear Door Security Locks..............................2-14
Lockout Protection........................................2-15
Trunk..........................................................2-15
Windows........................................................2-18
Power Windows............................................2-19
Sun Visors...................................................2-21
Theft-Deterrent Systems..................................2-21
Theft-Deterrent System..................................2-21
Valet Lockout Switch.....................................2-23
Immobilizer..................................................2-24
Immobilizer Operation....................................2-24Starting and Operating Your Vehicle................2-25
New Vehicle Break-In....................................2-25
Ignition Positions..........................................2-26
Retained Accessory Power (RAP)...................2-27
Starting the Engine.......................................2-27
Engine Coolant Heater..................................2-29
Automatic Transmission Operation...................2-30
Parking Brake..............................................2-33
Shifting Into Park..........................................2-34
Shifting Out of Park......................................2-35
Parking Over Things That Burn.......................2-35
Engine Exhaust............................................2-36
Running the Vehicle While Parked..................2-37
Mirrors...........................................................2-38
Automatic Dimming Rearview Mirror...............
.2-38
Compass.....................................................2-38
Outside Power Mirrors...................................2-40
Outside Automatic Dimming Mirror..................2-40
Park Tilt Mirrors............................................2-41
Outside Convex Mirror...................................2-41
Outside Heated Mirrors..................................2-41
Section 2 Features and Controls
2-1

Programmable Automatic Door
Locks
The vehicle was programmed so when the doors are
closed, the ignition is on, and the shift lever is moved
out of P (Park), all the doors will lock.
The front doors can still be opened from the inside while
the doors are locked. If a rear passenger needs to exit the
vehicle, have that person use the manual knob or use the
power door lock switch on either front door. When the
door is closed again, it will not lock automatically. Use
the manual knob or the power door lock switch to lock
the door.
The doors were also pre-programmed to unlock every
time the shift lever is moved into P (Park).
The power door locks can be programmed through the
radio display. The radio display allows you to choose
various lock and unlock settings. For more information
on programming, seeVehicle Personalization on
page 2-61.
Rear Door Security Locks
The vehicle has rear door security locks to prevent
passengers from opening the rear doors from the inside.
Open the rear doors to
access the security locks
on the inside edge of
each door.
To set the locks, insert a key into the slot and turn it to
the horizontal position. The door can only be opened from
the outside with the door unlocked. To return the door to
normal operation, turn the slot to the vertical position.
2-14

If your vehicle has lost battery power, you can still
access the trunk by unlocking and lowering the rear seat
pass-through door and pulling the emergency trunk
release handle.
Rear Seat Pass-Through Door
To open the door:
1. Pull the rear seat armrest down.
2. If the door is locked, insert the key into the lock and
turn it counterclockwise.
3. Press the button above the lock and lower the door.
To open the trunk lid, pull the emergency trunk release
handle located in the trunk on the other side of the
door opening. See “Emergency Trunk Release Handle”
following.
Emergency Trunk Release Handle
Notice:Do not use the emergency trunk release
handle as a tie-down or anchor point when securing
items in the trunk as it could damage the handle.
There is a glow-in-the-dark trunk release handle located
inside the trunk near the back of the rear seats. This
handle will glow following exposure to light. Pull down
the release handle to open the trunk from the inside of
the vehicle.
2-17

Window Lockout
o
(Window Lockout):Press to disable the rear
window controls. The light on the button illuminates,
indicating that the feature is in use. The rear windows
can still be raised or lowered using the driver’s window
switches. To restore power to the rear windows, press
the button again.
The front passenger window can be programmed
to be disabled using the window lockout button.
SeeVehicle Personalization on page 2-61.
Secure Car Feature
The windows can be closed by pressing the lock button
on the keyless access transmitter. SeeKeyless Access
System Operation on page 2-5for more information.
If any window is unable to close completely, it reverses
and the horn chirps. See “Anti-Pinch Feature” previously.
The engine must be off to operate this feature.
Sun Visors
Swing down the visor or detach it from the center mount
and move to the side to block out glare. The visors also
have side-to-side slide capability for greater coverage.
Pull the visor down and lift the cover. Move the slide
switch up or down to brighten or dim the lamp.
Theft-Deterrent Systems
Vehicle theft is big business, especially in some cities.
This vehicle has theft-deterrent features, however,
they do not make it impossible to steal.
Theft-Deterrent System
Your vehicle has a theft-deterrent alarm system.
The security light is
located on the instrument
panel cluster.
If the ignition is off and a door is open, the security
light will ash, reminding you to arm the theft-deterrent
system.
2-21

To arm the system:
Press the lock button on the keyless access
transmitter. If the door is closed when the lock button
is pressed, the security light will stay illuminated
for 30 seconds. After the security light goes off, the
theft-deterrent system is armed. Pressing the lock
button twice will arm the system immediately.
If the vehicle is locked using the keyless access
transmitter and the trunk lid, hood or a door is open
or not closed completely, the security light will ash
for 60 seconds and then turn off. The theft-deterrent
system is armed but the alarm will not sound if
the trunk lid, hood or door that was not closed
completely is tampered with or opened. The alarm
will sound for the trunk lid, hood or a door that was
completely closed at the time the vehicle was locked
using the keyless access transmitter.
Exit the vehicle and lock the door with the power
door lock switch or lock button on the keyless access
transmitter. The security light should ash. Close the
door. The security light will stop ashing and stay
on. After 30 seconds the light should turn off, the
theft-deterrent system is armed.
If Passive Arming is activated through the vehicle
personalization feature, the system will arm
automatically after you close the door and take at
least one keyless access transmitter with you. The
security light will turn on. After 60 seconds the light
should turn off. The theft-deterrent system is armed.
SeeVehicle Personalization on page 2-61.
If a door, hood, or the trunk is opened without the
keyless access transmitter, the horn will sound for
30 seconds and the lamps will ash for two minutes.
The vehicle cannot be started without a keyless access
transmitter.
The Theft-Deterrent system will not arm if:
The key is used to turn the key cylinder to the lock
position.
The driver’s door is locked using the power door
lock switch after the doors are closed.
The vehicle can be programmed to automatically unlock
the doors and disarm the theft-deterrent system when
you approach the vehicle and the keyless access
transmitter is with you. SeeVehicle Personalization
on page 2-61.
Pressing the unlock button on the keyless access
transmitter or using the key to unlock the driver’s door
disarms the theft-deterrent system. Unlocking a door
any other way while the system is armed will activate
the alarm.
2-22

Testing the Alarm
1. From inside the vehicle, roll down the window, then
get out of the vehicle, keeping the door open.
2. From outside of the vehicle, with the door open,
lock the vehicle using the power door lock switch
or the keyless access transmitter and close the
door. Wait about 30 seconds until the security light
goes off.
3. Reach in and open the door using the inside door
handle. The horn will sound and the exterior lamps
will ash.
You can turn off the alarm by pressing the unlock button
on the keyless access transmitter or by starting the car.
If the alarm does not sound when it should, check to
see if the horn works. The horn fuse may be blown.
To replace the fuse, seeFuses and Circuit Breakers on
page 5-123. If the fuse does not need to be replaced,
you may need to have your vehicle serviced.
To reduce the possibility of theft, always arm the
Theft-Deterrent system when leaving your vehicle.
Do not leave the key or device that disarms or
deactivates the theft deterrent system in the vehicle.
Valet Lockout Switch
The valet lockout switch
is located inside the
glove box.
9(Off):Press to turn the lockout feature off and allow
the trunk to be opened with either the keyless access
transmitter or the trunk release button located on
the driver’s door.
R(On):Press to turn the lockout feature on. The trunk
cannot be unlocked or opened. When the valet lockout
feature is on, the remote start feature and the Universal
Home Remote transmitter will be disabled
Lock the glove box with the key to further secure the
vehicle.
SeeKeyless Access System Operation on page 2-5and
Trunk on page 2-15for additional information.
2-23

Immobilizer
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
1. This device may not cause interference.
2. This device must accept any interference received,
including interference that may cause undesired
operation.
This device complies with RSS-210 of Industry Canada.
Operation is subject to the following two conditions:
1. This device may not cause interference.
2. This device must accept any interference received,
including interference that may cause undesired
operation of the device.
Changes or modications to this system by other than
an authorized service facility could void authorization to
use this equipment.
Immobilizer Operation
The vehicle has a passive theft-deterrent system.
The system is automatically armed when the ignition is
turned off.
The immobilization system is disarmed when the ignition
is turned to OFF/ACCESSORY or START and a valid
transmitter is found in the vehicle.
You do not have to manually arm or disarm the system.
The security light comes on if there is a problem with
arming or disarming the theft-deterrent system.
The system has one or more keyless access
transmitters that are matched to an immobilizer control
unit in the vehicle. Only a correctly matched keyless
access transmitter starts the vehicle. The vehicle
may not start if the keyless access transmitter is
damaged.
2-24