2018 CADILLAC ATS ECU

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
26 KEYS, DOORS, AND WINDOWS
Keys, Doors, and
Windows
Keys and Locks
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Remote Keyless Entry (RKE)System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Remote Keyless Entry (RKE) System Operation . . . . . . . . . . . . . . . . 27
Remote Vehicle Start . . . . . . . . . . . . . . 34
Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . 35
Power Door Locks . . . . . . . . . . . . . . . . . 37
Delayed Locking . . . . . . . . . . . . . . . . . . . 37
Automatic Door Locks . . . . . . . . . . . . 38
Lockout Protection . . . . . . . . . . . . . . . . 38
Safety Locks . . . . . . . . . . . . . . . . . . . . . . . . 38
Doors
Trunk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Vehicle Security
Vehicle Security . . . . . . . . . . . . . . . . . . . . 41
Vehicle Alarm System . . . . . . . . . . . . . 41
Immobilizer . . . . . . . . . . . . . . . . . . . . . . . . 43
Immobilizer Operation . . . . . . . . . . . . 43
Exterior Mirrors
Convex Mirrors . . . . . . . . . . . . . . . . . . . . 44
Power Mirrors . . . . . . . . . . . . . . . . . . . . . . 44 Folding Mirrors . . . . . . . . . . . . . . . . . . . . 44
Heated Mirrors . . . . . . . . . . . . . . . . . . . . . 45
Automatic Dimming Mirror . . . . . . . 45
Reverse Tilt Mirrors . . . . . . . . . . . . . . . 45
Interior Mirrors
Interior Rearview Mirrors . . . . . . . . . 46
Automatic Dimming Rearview
Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Windows
Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Power Windows . . . . . . . . . . . . . . . . . . . . 46
Sun Visors . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Rear Window Sunshade . . . . . . . . . . . 49
Roof
Sunroof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Keys and Locks
Keys
{Warning
Leaving children in a vehicle with a
Remote Keyless Entry (RKE)
transmitter is dangerous and
children or others could be
seriously injured or killed. They
could operate the power windows
or other controls or make the
vehicle move. The windows will
function with the RKE transmitter
in the vehicle, and children or
others could be caught in the path
of a closing window. Do not leave
children in a vehicle with an RKE
transmitter.

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
KEYS, DOORS, AND WINDOWS 37
2. Insert the two tabs (6) at theback of the cap between the
seal (5) and the metal base (4).3. Slide the cap forward and pressthe forward edge to install the
cap in place.
4. Release the door handle.
5. Check that the cap is secure.
Free-Turning Locks
The door key lock cylinder turns freely
when either the wrong key is used,
or the correct key is not fully inserted.
The free-turning door lock feature
prevents the lock from being forced
open. To reset the lock, turn it to the
vertical position with the correct key
fully inserted. Remove the key and
insert it again. If this does not reset the lock, turn the key halfway around
in the cylinder and repeat the reset
procedure.
Power Door Locks
Q:
Press to lock the doors.
K:Press to unlock the doors.
Delayed Locking
This feature delays the actual locking
of the doors.
Delayed locking can only be turned on
when the Open Door Anti-Lockout
feature has been turned off.

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
KEYS, DOORS, AND WINDOWS 41
Emergency Trunk Release
Handle
Caution
Do not use the emergency trunk(Continued)
Caution (Continued)
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 emergency
trunk release handle on the trunk lid.
This handle will glow following
exposure to light. Pull the release
handle to open the trunk from the
inside.
After use, return to the stored
position.
Vehicle Security
This vehicle has theft-deterrent
features; however, they do not make
the vehicle impossible to steal.
Vehicle Alarm System
This vehicle has an anti-theft alarm
system.
The indicator light, on the instrument
panel near the windshield, indicates
the status of the system.
Off : Alarm system is disarmed.
On Solid : Vehicle is secured during
the delay to arm the system.

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
42 KEYS, DOORS, AND WINDOWS
Fast Flash :Vehicle is unsecured.
A door, the hood, or the trunk is open.
Slow Flash : Alarm system is armed.
Arming the Alarm System
1. Close the trunk and the hood.
Turn off the vehicle.
2. Lock the vehicle in one of three ways:
.Use the RKE transmitter.
. Use the Keyless Access
system.
. With a door open, press the
inside
Q.
3. After 30 seconds the alarm system will arm, and the
indicator light will begin to
slowly flash indicating the alarm
system is operating. Pressing
Q
on the RKE transmitter a second
time will bypass the 30-second
delay and immediately arm the
alarm system.
The vehicle alarm system will not arm
if the doors are locked with the key. If the driver door is opened without
first unlocking with the RKE
transmitter, the horn will chirp and
the lights will flash to indicate
pre-alarm. If the vehicle is not started,
or the door is not unlocked by
pressing
Kon the RKE transmitter
during the 10–second pre-alarm, the
alarm will be activated.
The alarm will also be activated if a
passenger door, the trunk, or the hood
is opened without first disarming the
system. When the alarm is activated,
the turn signals flash and the horn
sounds for about 30 seconds. The
alarm system will then re-arm to
monitor for the next unauthorized
event.
Disarming the Alarm System
To disarm the alarm system or turn
off the alarm if it has been activated:
. Press
Kon the RKE transmitter.
. Unlock the vehicle using the
Keyless Access system.
. Start the vehicle. To avoid setting off the alarm by
accident:
.
Lock the vehicle after all
occupants have left the vehicle
and all doors are closed.
. Always unlock a door with the
RKE transmitter or use the Keyless
Access system.
Unlocking the driver door with the key
will not disarm the system or turn off
the alarm.
How to Detect a Tamper
Condition
IfKis pressed and the horn chirps
and the lights flash three times, the
alarm was activated while the alarm
system was armed.
If the alarm system has been
activated, a message will appear on
the DIC.

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
KEYS, DOORS, AND WINDOWS 43
Immobilizer
SeeRadio Frequency Statement 0349.
Immobilizer Operation
This vehicle has a passive
theft-deterrent system.
The system does not have to be
manually armed or disarmed.
The vehicle is automatically
immobilized when the vehicle is
turned off.
The immobilization system is
disarmed when the ignition is on or in
ACC/ACCESSORY and a valid
transmitter is in the vehicle.
The security light in the instrument
cluster comes on if there is a problem
with arming or disarming the
theft-deterrent system. The system has one or more RKE
transmitters matched to an
immobilizer control unit in your
vehicle. Only a correctly matched RKE
transmitter will start the vehicle.
If the transmitter is ever damaged,
you may not be able to start your
vehicle.
When trying to start the vehicle, the
security light may come on briefly
when the ignition is turned on.
If the engine does not start and the
security light stays on, there is a
problem with the system. Turn the
ignition off and try again.
If the vehicle will not change ignition
modes (ACC/ACCESSORY, on, off), and
the RKE transmitter appears to be
undamaged, try another transmitter.
Or, you may try placing the
transmitter in the transmitter pocket
in the center console.
If the ignition modes will not change
with the other transmitter, or with the
transmitter in the transmitter pocket,
your vehicle needs service. If the
ignition does change modes, the first
transmitter may be faulty. See yourdealer who can service the
theft-deterrent system and have a new
RKE transmitter programmed to the
vehicle.
It is possible for the immobilizer
system to learn new or replacement
RKE transmitters. Up to eight
transmitters can be programmed for
the vehicle. To program additional
transmitters, see
“Programming
Transmitters to the Vehicle ”under
Remote Keyless Entry (RKE) System
Operation 027.
Do not leave the transmitter or device
that disarms or deactivates the
theft-deterrent system in the vehicle.

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
52 SEATS AND RESTRAINTS
Seats and Restraints
Head Restraints
Head Restraints . . . . . . . . . . . . . . . . . . . . 53
Front Seats
Power Seat Adjustment . . . . . . . . . . . 56
Lumbar Adjustment . . . . . . . . . . . . . . . 57
Thigh Support Adjustment . . . . . . . . 59
Reclining Seatbacks . . . . . . . . . . . . . . . 59
Memory Seats . . . . . . . . . . . . . . . . . . . . . . 60
Heated and Ventilated FrontSeats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Massage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Rear Seats
Rear Seats . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Rear Seat Armrest . . . . . . . . . . . . . . . . . 67
Heated Rear Seats . . . . . . . . . . . . . . . . . 67
Rear Seat Pass-Through Door . . . . . 68
Seat Belts
Seat Belts . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
How to Wear Seat Belts Properly . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Lap-Shoulder Belt . . . . . . . . . . . . . . . . . . 71
Seat Belt Use During Pregnancy . . . . . . . . . . . . . . . . . . . . . . . . . 74
Seat Belt Extender . . . . . . . . . . . . . . . . . 74
Safety System Check . . . . . . . . . . . . . . 75 Seat Belt Care . . . . . . . . . . . . . . . . . . . . . . 75
Replacing Seat Belt System Parts
after a Crash . . . . . . . . . . . . . . . . . . . . . . 75
Airbag System
Airbag System . . . . . . . . . . . . . . . . . . . . . 76
Where Are the Airbags? . . . . . . . . . . . 78
When Should an AirbagInflate? . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
What Makes an Airbag Inflate? . . . 80
How Does an Airbag Restrain? . . . 81
What Will You See after an Airbag Inflates? . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Passenger Sensing System . . . . . . . . 82
Servicing the Airbag-Equipped Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Adding Equipment to the
Airbag-Equipped Vehicle . . . . . . . . 87
Airbag System Check . . . . . . . . . . . . . . 88
Replacing Airbag System Parts after a Crash . . . . . . . . . . . . . . . . . . . . . . 88
Child Restraints
Older Children . . . . . . . . . . . . . . . . . . . . . 89
Infants and Young Children . . . . . . 90
Child Restraint Systems . . . . . . . . . . . 93
Where to Put the Restraint . . . . . . . 94
Lower Anchors and Tethers forChildren (LATCH System) . . . . . . . 95
Replacing LATCH System Parts After a Crash . . . . . . . . . . . . . . . . . . . . 101 Securing Child Restraints (With
the Seat Belt in the
Rear Seat) . . . . . . . . . . . . . . . . . . . . . . . 102
Securing Child Restraints (With the Seat Belt in the
Front Seat) . . . . . . . . . . . . . . . . . . . . . . 104

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
SEATS AND RESTRAINTS 55
The head restraint will fold forward
automatically.
When an occupant or child restraint is
in the seat, always return the head
restraint to the full upright position.
Pull the head restraint up and push it
rearward until it locks into place. Push
and pull on the head restraint to make
sure that it is locked.
Always adjust the head restraint so
that the top of the restraint is at the
same height as the top of the
occupant's head.
The rear seat outboard head restraints
are not intended to be removed.
If removal is required see your dealerfor assistance with removal. In the
event of an emergency, the following
can be used as removal and
installation instructions. Store the
removed head restraints in a secure
place. Reinstall the head restraints
before the seating position is
occupied.
Head Restraint Removal and
Reinstallation
To remove the head restraint:
1. Partially fold the seatback forward. See Rear Seats065 for
additional information.
2. Press both buttons on the head restraint posts at the same time,
and pull up on the head
restraint.
3. Store the head restraint in a secure place.
{Warning
With head restraints that are not
installed and adjusted properly,
there is a greater chance that
occupants will suffer a neck/spinal
injury in a crash. Do not drive until
the head restraints for all occupants
are installed and adjusted properly.

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
72 SEATS AND RESTRAINTS
3. Pick up the latch plate and pullthe belt across you. Do not let it
get twisted.
The lap-shoulder belt may lock if
you pull the belt across you very
quickly. If this happens, let the
belt go back slightly to unlock it.
Then pull the belt across you
more slowly.
If the shoulder portion of a
passenger belt is pulled out all
the way, the child restraint
locking feature may be engaged.
If this happens, let the belt go
back all the way and start again.If the webbing locks in the latch
plate before it reaches the
buckle, tilt the latch plate flat to
unlock.
4. Push the latch plate into thebuckle until it clicks.
Pull up on the latch plate to
make sure it is secure. If the belt
is not long enough, see Seat Belt
Extender 074.
Position the release button on
the buckle so that the seat belt
could be quickly unbuckled if
necessary.
5. If equipped with a shoulder belt height adjuster, move it to the
height that is right for you. See
“Shoulder Belt Height Adjuster”
later in this section for use and
important safety information.