2008 CADILLAC STS ECU

Keys...............................................................2-3
Keyless Access System...................................2-5
Keyless Access System Operation....................2-6
Remote Vehicle Start....................................2-12
Doors and Locks............................................2-14
Door Locks..................................................2-14
Power Door Locks........................................2-14
Programmable Automatic Door Locks..............2-15
Rear Door Security Locks..............................2-15
Lockout Protection........................................2-16
Trunk..........................................................2-16
Windows........................................................2-19
Power Windows............................................2-20
Sun Visors...................................................2-22
Theft-Deterrent Systems..................................2-22
Theft-Deterrent System..................................2-22
Valet Lockout Switch.....................................2-25
Immobilizer..................................................2-26
Immobilizer Operation....................................2-26Starting and Operating Your Vehicle................2-27
New Vehicle Break-In....................................2-27
Ignition Positions..........................................2-28
Retained Accessory Power (RAP)...................2-29
Starting the Engine.......................................2-29
Engine Coolant Heater..................................2-31
Automatic Transmission Operation...................2-32
Parking Brake..............................................2-35
Shifting Into PARK (P)...................................2-36
Shifting Out of PARK (P)...............................2-37
Parking Over Things That Burn.......................2-38
Engine Exhaust............................................2-38
Running the Engine While Parked...................2-39
Mirrors...........................................................2-40
Automatic Dimming Rearview Mirror
with Intellibeam™ and OnStar
®...................2-40
Automatic Dimming Rearview Mirror................2-40
Automatic Dimming Rearview Mirror
with OnStar
®............................................2-40
Section 2 Features and Controls
2-1

Programmable Automatic
Door Locks
Your vehicle was programmed from the factory so that
when the doors are closed, the ignition is on and the shift
lever is moved out of PARK (P), 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 programmed from the factory to
unlock every time the shift lever is moved back into
PARK (P).
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 2-60.
Rear Door Security Locks
Your vehicle has rear door security locks. These
prevent passengers from opening the rear doors from
the inside.
The rear door security
locks are located on the
inside edge of each
rear door. The rear doors
must be open to access
them. The label showing
lock and unlock positions is
located near the lock.
To set the locks, do the following:
1. Insert the key into the security lock slot and turn it
so the slot is in the horizontal position.
2. Close the door.Lock Label shown
2-15

When you want to open a rear door when the security
lock is on, do the following:
1. Unlock the door using the remote keyless entry
transmitter, if the vehicle has one, the power
door lock switch, or the rear door manual lock.
2. Open the door from the outside.
To cancel the rear door security lock, do the following:
1. Unlock the door and open it from the outside.
2. Insert the key into the security lock slot and turn it
so the slot is in the vertical position.
Lockout Protection
Your vehicle can be programmed to sound the horn
three times and unlock the driver’s door when all doors
are closed and there is a keyless access transmitter
inside the interior of the vehicle. When the driver’s door
is reopened, the key in reminder chime will sound
continuously. The vehicle will remain locked only when
at least one transmitter has been removed from the
vehicle and both doors are closed. SeeVehicle
Personalization on page 2-60.
Trunk
{CAUTION:
It can be dangerous to drive with the trunk lid
open because carbon monoxide (CO) gas can
come into your vehicle. You cannot see or
smell CO. It can cause unconsciousness and
even death. If you must drive with the trunk lid
open or if electrical wiring or other cable
connections must pass through the seal
between the body and the trunk lid:
Make sure all other windows are shut.
Turn the fan on your heating or cooling
system to its highest speed and select the
control setting that will force outside air
into your vehicle. See Climate Control
System.
If you have air outlets on or under the
instrument panel, open them all the way.
SeeEngine Exhaust on page 2-38.
2-16

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.
2-18

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 light on the button will go out.
The front passenger window can be programmed to be
disabled using the window lockout button. SeeVehicle
Personalization on page 2-60.
Secure Car Feature
The windows can be closed by pressing the lock button
on the keyless access transmitter. SeeKeyless Access
System Operation on page 2-6for 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.
Although your vehicle has a number of theft-deterrent
features, we know that nothing we put on it can 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.
2-22

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. At this time, 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.
Open the door. 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.
Passive Arming, if activated through the vehicle
personalization feature, will arm the system
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 2-60.
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.
2-23

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. At this time, 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.
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 2-60.
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.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 5-117. 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.
2-24

Valet Lockout Switch
The valet lockout switch
is located inside the
glove box.
9(Off):Press9to turn the lockout feature off.
When the lockout feature is off, you can open the trunk
using either the keyless access transmitter or the
trunk release button located on the driver’s door.
R(On):PressRto turn the lockout feature on.
When the lockout feature is turned on, the trunk cannot
be unlocked with the keyless access transmitter or
the trunk release button located on the driver’s door.
If the valet lockout feature is on it will also disable
the remote start feature and the Universal Home
Remote transmitter, if equipped.
Locking the glove box with your key will also help to
secure your vehicle.
SeeKeyless Access System Operation on page 2-6
andTrunk on page 2-16for additional information.
2-25