2003 CADILLAC DEVILLE ECU

{CAUTION:
Both frontal and side impact air bags in¯ate
with great force, faster than the blink of an
eye. If you're too close to an in¯ating air bag,
as you would be if you were leaning forward, it
could seriously injure you. Safety belts help
keep you in position for air bag in¯ation before
and during a crash. Always wear your safety
belt even with frontal air bags. The driver
should sit as far back as possible while still
maintaining control of the vehicle. Occupants
should not lean on or sleep against the door.
{CAUTION:
Anyone who is up against, or very close to,
any air bag when it in¯ates can be seriously
injured or killed. Air bags plus lap-shoulder
belts offer the best protection for adults, but
not for young children and infants. Neither the
vehicle's safety belt system nor its air bag
system is designed for them. Young children
and infants need the protection that a child
restraint system can provide. Always secure
children properly in your vehicle. To read how,
see the part of this manual called ªOlder
Childrenº or ªInfants and Young Children.º
1-51

Keys...............................................................2-3
Remote Keyless Entry System.........................2-4
Remote Keyless Entry System Operation...........2-5
Doors and Locks.............................................2-8
Door Locks....................................................2-8
Central Door Unlocking System........................2-9
Power Door Locks..........................................2-9
Programmable Automatic Door Locks................2-9
Rear Door Security Locks..............................2-10
Lockout Protection........................................2-11
Leaving Your Vehicle....................................2-11
Trunk..........................................................2-11
Windows........................................................2-15
Power Windows............................................2-16
Sun Visors...................................................2-18
Theft-Deterrent Systems..................................2-19
PASS-Key
žIII ..............................................2-21
PASS-KeyžIII Operation...............................2-21
Starting and Operating Your Vehicle................2-23
New Vehicle Break-In....................................2-23
Ignition Positions..........................................2-23
Starting Your Engine.....................................2-25Engine Coolant Heater..................................2-25
Automatic Transaxle Operation.......................2-27
Parking Brake..............................................2-32
Shifting Into Park (P).....................................2-34
Shifting Out of Park (P).................................2-37
Parking Over Things That Burn.......................2-38
Engine Exhaust............................................2-38
Running Your Engine While You Are Parked. . . .2-39
Mirrors...........................................................2-40
Automatic Dimming Rearview Mirror with
OnStar
ž...................................................2-40
Automatic Dimming Rearview Mirror with
OnStar
žand Compass...............................2-40
Outside Power Mirrors...................................2-42
Outside Automatic Dimming Mirror..................2-43
Outside Curb View Assist Mirror.....................2-43
Outside Convex Mirror...................................2-44
Outside Heated Mirrors..................................2-44
OnStar
žSystem.............................................2-45
HomeLinkžTransmitter...................................2-47
Programming the HomeLinkžTransmitter.........2-48
Section 2 Features and Controls
2-1

Rear Door Security Locks
Your vehicle is equipped with rear door security locks
that prevent passengers from opening the rear doors on
your vehicle from the inside.
The rear door security
locks are located on the
edge of each rear
door. You must open the
doors to access them.
To use these locks, do the following:
1. Turn the knob located on the passenger's side rear
door clockwise to engage the lock.
2. Close the door.
3. Turn the knob located on the driver's side rear door
counterclockwise to engage the lock.
The rear doors on your vehicle cannot be opened from
the inside when this feature is in use.When you want to open a rear door while the security
lock is on, do the following:
1. Unlock the door using the remote keyless entry
transmitter, the front door power lock switch or
by lifting the rear door manual lock.
2. Then 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. Turn the knob on the passenger's side of the rear
door counterclockwise all the way back to the
original position.
3. Turn the knob on the driver's side of the rear door
clockwise all the way back to the original position.
The rear door locks will now work normally.
2-10

Your vehicle may be equipped with a trunk-lid tie down.
This feature is used to secure the trunk lid if it will
not close completely, such as when carrying large
packages in the trunk. Use the following steps to secure
the trunk lid:
1. Attach the clip end of the tie down to the D ring on
the trunk lid (A).
2. Attach the hook end of the tie down to the striker
located at the center of the trunk sill (B).
3. Tighten the tie down by pulling the free end of the
cord until secure.
4. To remove the tie down, press the clip end release
and loosen the cord.
Emergency Trunk Release Handle
Notice:The emergency trunk release handle is not
designed to be used to tie down the trunk lid or
as an anchor point when securing items in the trunk.
Improper use of the emergency trunk release
handle could damage it.
There is a glow-in-the-dark emergency trunk release
handle located inside the trunk near the latch. This
handle will glow following exposure to light. Pull the
release handle upward to open the trunk from the inside.
2-13

Never store objects on the rear shelf because they may
get caught in the sunshade or be tossed about in
your vehicle.
Manual Rear Side Door Sunshade
Your vehicle may have manual rear side door
sunshades. To use the sunshades, lower the side
windows and hook the top edge of the retractable
sunshades over the edge of the windows and raise the
windows. To remove the shades, lower the windows
and the hooks will disengage automatically.
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.
The SECURITY light is
located on the instrument
panel cluster.
If the ignition is off and any door is open, the SECURITY
light will ¯ash, reminding you to arm the system.To arm the system, do the following:
1. Open the door.
2. Lock the door using the power door lock switch with
the door open or the remote keyless entry
transmitter. The SECURITY light should come on
and stay on.
3. Close all the doors. The SECURITY light should go
off within approximately 30 seconds.
If a door or the trunk is opened without a key or a
remote keyless entry transmitter, the horn will sound
and the lamps will ¯ash for about 30 seconds.
Remember, the theft-deterrent system won't arm if you
lock the doors with a key or use the manual door
lock. It activates only if you use a power door lock with
the door open or the remote keyless entry transmitter.
To avoid activating the alarm by accident do the
following:
·The vehicle should be locked with the door key or
the manual door lock after the doors are closed if
you don't want to arm the theft-deterrent system.
·Always unlock a door with a key or use the remote
keyless entry transmitter system. Pressing the
unlock button on the remote keyless entry
transmitter disables the theft-deterrent system.
Unlocking a door any other way will activate
the alarm when a door or the trunk is opened.
2-19

If you activate the alarm by accident, unlock the driver's
door with your key. You can also turn off the alarm by
using the unlock button on the remote keyless entry
transmitter system, or by starting the car with a valid key.
Changes or modi®cations made to this system by other
than an authorized service facility could void
authorization to use the theft system.
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 or the remote
keyless entry system and close the door. Wait 30
seconds until the SECURITY lamp goes off.
3. Reach in and unlock the door using the manual
lock and open the door. The horn will sound and
the hazard lights will ¯ash.
You can turn off the alarm by unlocking the driver's door
with your key, using the unlock button on the remote
keyless entry transmitter or by starting the car with
a valid key.
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, see
Fuses and Circuit Breakers on
page 5-94. 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.
Valet Lockout Switch
The valet lockout switch
is located inside the
glove box.
Press the switch to ON to disable the use of the trunk,
fuel door, garage door opener and optional cellular
telephone. The remote keyless entry transmitter cannot
open the trunk if the valet lockout switch is in ON.
Press this switch to OFF to enable the use of the trunk,
fuel door, garage door opener and optional cellular
telephone.
Locking the glove box with your key will also help to
secure your vehicle.
2-20

PASS-KeyžIII
Your PASS-KeyžIII system operates on a radio
frequency subject to Federal Communications
Commission (FCC) Rules and with Industry 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.
This device complies with RSS-210 of Industry Canada.
Operation is subject to the following two conditions:
(1) this device may not cause interference, and (2) this
device must accept any interference received,
including interference that may cause undesired
operation of the device.
Changes or modi®cations to this system by other than
an authorized service facility could void authorization to
use this equipment.
PASS-Key
žIII uses a radio frequency transponder in
the key that matches a decoder in your vehicle.
PASS-KeyžIII Operation
Your vehicle is equipped with the PASS-KeyžIII
(Personalized Automotive Security System)
theft-deterrent system. PASS-Key
žIII is a passive
theft-deterrent system. This means you don't have to do
anything different to arm or disarm the system. It works
when you insert or remove your key from the ignition.
When the PASS-Key
žIII system senses that someone
is using the wrong key, it shuts down the vehicle's
starter and fuel systems. The starter will not work and
fuel will stop being delivered to the engine. Anyone
using a trial-and-error method to start the vehicle will be
discouraged because of the high number of electrical
key codes.
When trying to start the
vehicle, if the engine does
not start and the
SECURITY light comes on,
the key may have a
damaged transponder.
Turn the ignition off and
try again.
2-21

If the engine does not start, and the key appears to be
undamaged, try another ignition key. At this time,
you may also want to check the fuse. See
Fuses and
Circuit Breakers on page 5-94. If the engine still
does not start with the other key, your vehicle needs
service. If your vehicle does start, the ®rst key may be
faulty. See your dealer who can service the PASS-Key
ž
III to have a new key made.
It is possible for the PASS-Key
žIII decoder to learn the
transponder value of a new or replacement key. Up to 10
additional keys may be programmed for the vehicle. This
procedure is for learning additional keys only.
Canadian Owners:If you lose or damage your keys,
only a GM dealer can service PASS-Key
žIII to
have new keys made. To program additional keys you
will require two current driver's keys (black in color). You
must add a step to the following procedure. After
Step 2, repeat Steps 1 and 2 with the second current
driver's key. Then continue with Step 3.
To program the new key do the following:
1. Verify that the new key has PK3 stamped on it.
2. Insert the current driver's key in the ignition
and start the engine. If the engine will not start see
your dealer for service.
3. After the engine has started, turn the key to OFF,
and remove the key.4. Insert the key to be programmed and turn it to ON
within 10 seconds of removing the previous key.
5. The SECURITY light will turn off once the key has
been programmed. It may not be apparent that the
SECURITY light went on due to how quickly the
key is programmed.
6. Repeat the Steps 1 through 4 if additional keys are
to be programmed.
If you are ever driving and the SECURITY light comes
on and stays on, you will be able to restart your
engine if you turn it off. Your PASS- Key
žIII system,
however, is not working properly and must be serviced
by your dealer. Your vehicle is not protected by the
PASS-Key
žIII system at this time.
If you lose or damage a PASS-Key
žIII key, your dealer
to have a new key made.
In an emergency, contact Cadillac Roadside Assistance.
See
Roadside Service on page 7-6.
2-22