2020 BUICK REGAL ECU

Buick Regal Owner Manual (GMNA-Localizing-U.S./Canada-13557849) -
2020 - CRC - 6/25/19
Keys, Doors, and Windows 7
Keys, Doors, and
Windows
Keys and Locks
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Remote Keyless Entry (RKE)System . . . . . . . . . . . . . . . . . . . . . . . . 8
Remote Keyless Entry (RKE) System Operation . . . . . . . . . . . . . 8
Remote Vehicle Start . . . . . . . . . . 15
Door Locks . . . . . . . . . . . . . . . . . . . . 17
Power Door Locks . . . . . . . . . . . . . 19
Delayed Locking . . . . . . . . . . . . . . . 19
Automatic Door Locks . . . . . . . . . 19
Lockout Protection . . . . . . . . . . . . . 20
Safety Locks . . . . . . . . . . . . . . . . . . . 20
Doors
Liftgate . . . . . . . . . . . . . . . . . . . . . . . . 21
Vehicle Security
Vehicle Security . . . . . . . . . . . . . . . . 29
Vehicle Alarm System . . . . . . . . . 29
Immobilizer . . . . . . . . . . . . . . . . . . . . 30
Immobilizer Operation . . . . . . . . . 30
Exterior Mirrors
Convex Mirrors . . . . . . . . . . . . . . . . 31
Power Mirrors . . . . . . . . . . . . . . . . . . 31 Folding Mirrors . . . . . . . . . . . . . . . . . 32
Heated Mirrors . . . . . . . . . . . . . . . . . 32
Reverse Tilt Mirrors . . . . . . . . . . . . 32
Interior Mirrors
Interior Rearview Mirrors . . . . . . . 33
Automatic Dimming Rearview
Mirror . . . . . . . . . . . . . . . . . . . . . . . . . 33
Windows
Windows . . . . . . . . . . . . . . . . . . . . . . . 33
Power Windows . . . . . . . . . . . . . . . 33
Sun Visors . . . . . . . . . . . . . . . . . . . . . 35
Roof
Sunroof . . . . . . . . . . . . . . . . . . . . . . . . 35
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.

Buick Regal Owner Manual (GMNA-Localizing-U.S./Canada-13557849) -
2020 - CRC - 6/25/19
Keys, Doors, and Windows 19
To replace the cap:1. Position the bottom edge of the cap under the lower edge of
the metal piece (2). The
tabs (3) attach to the metal
piece (2) at the positions (1).
2. Rotate the cap upward and install into place.
3. 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
K: Press to unlock the doors.
Q: Press to lock the doors. The
indicator light in the switch will
illuminate when activated.
Delayed Locking
This feature delays the locking of
the doors until five seconds after all
doors are closed.
Delayed locking can only be turned
on when Open Door Anti-Lockout
has been turned off. When
Qis pressed on the power
door lock switch while the door is
open, a chime will sound three
times indicating delayed locking is
active.
The doors will lock automatically
five seconds after all doors are
closed. If a door is reopened before
that time, the five-second timer will
reset when all doors are closed
again.
Press
Qon the door lock switch
again or press
Qon the RKE
transmitter to lock the doors
immediately.
This feature can also be
programmed. See Vehicle
Personalization 0138.
Automatic Door Locks
The doors will lock automatically
when all doors are closed, the
ignition is on, and the vehicle is
shifted out of P (Park).

Buick Regal Owner Manual (GMNA-Localizing-U.S./Canada-13557849) -
2020 - CRC - 6/25/19
Keys, Doors, and Windows 23
Power Liftgate Operation
(Station Wagon)
{Warning
Exhaust gases can enter the
vehicle if it is driven with the
liftgate, trunk/hatch open, or with
any objects that pass through the
seal between the body and the
trunk/hatch or liftgate. Engine
exhaust contains carbon
monoxide (CO) which cannot be
seen or smelled. It can cause
unconsciousness and even death.
If the vehicle must be driven with
the liftgate, or trunk/hatch open:. Close all of the windows.
. Fully open the air outlets on
or under the instrument
panel.
(Continued)
Warning (Continued)
.Adjust the climate control
system to a setting that
brings in only outside air
and set the fan speed to the
highest setting. See
“Climate Control Systems”
in the Index.
. If the vehicle has a power
liftgate, disable the power
liftgate function.
For more information about
carbon monoxide, see Engine
Exhaust 0183.
Caution
Driving with an open and
unsecured liftgate may result in
damage to the power liftgate
components.
Caution
Manually forcing the liftgate to
open or close during a power
cycle can damage the vehicle.
Allow the power cycle to
complete.
If equipped, the power liftgate can
be operated by:
.
bon the RKE transmitter.
.
8on the inside of the
driver door.
. The touch pad under the
emblem.

Buick Regal Owner Manual (GMNA-Localizing-U.S./Canada-13557849) -
2020 - CRC - 6/25/19
24 Keys, Doors, and Windows
.|under the open liftgate.
If equipped with a power liftgate, the
switch is on the driver door. The
vehicle must be in P (Park).
The modes are:
.MAX: Opens to maximum
height.
. 3/4: Opens to a reduced height
that can be set from 3/4 to fully
open. Use to prevent the liftgate
from opening into overhead
obstructions such as a garage
door or roof-mounted cargo. The
liftgate can be manually opened
all the way.
. OFF: Opens manually only.
To power open or close the liftgate,
select MAX or 3/4 mode.
. Press
btwice on the RKE
transmitter.
. Press
8on the driver door.
The driver door must either be
unlocked or locked without the
security armed.
. Press the touch pad under the
emblem. .
Press
|under the open
liftgate.
Press any liftgate switch while the
liftgate is moving to reverse the
direction.
The power liftgate may be
temporarily disabled under extreme
low temperatures, or after repeated
power cycling over a short period of
time. If this occurs, the liftgate can
still be operated manually.
If the vehicle is shifted out of
P (Park) while the power function is
in progress, the liftgate will continue
to completion. If the vehicle is
accelerated before the liftgate has
completed moving, the liftgate may
stop or reverse direction. Check for
Driver Information Center (DIC)
messages and make sure the
liftgate is closed and latched before
driving.
Falling Liftgate Detection
If the power liftgate automatically
closes after a power opening cycle,
it indicates that the system is
reacting to excess weight on the

Buick Regal Owner Manual (GMNA-Localizing-U.S./Canada-13557849) -
2020 - CRC - 6/25/19
Keys, Doors, and Windows 29
Vehicle Security
This vehicle has theft-deterrent
features; however, they do not make
the vehicle impossible to steal.
Vehicle Alarm System
Anti-Theft Alarm System
The system monitors:
.The doors, liftgate, and hood.
. The passenger compartment
and cargo area.
. Vehicle inclination.
. The ignition. Indicator Light
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.
Fast Flash : Vehicle is unsecured.
A door, the hood, or the liftgate is
open, or there is a system fault.
Slow Flash : Alarm system is
armed.
Arming the Alarm System
1. Close the liftgate 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
Q
on the interior of the door.
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
Qon 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

Buick Regal Owner Manual (GMNA-Localizing-U.S./Canada-13557849) -
2020 - CRC - 6/25/19
30 Keys, Doors, and Windows
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.
If a door, the hood, or the liftgate is
opened without first disarming the
system, the turn signals will flash
and the horn will sound for about
30 seconds. The alarm system will
then re-arm to monitor for the next
unauthorized event.
Disarming the Alarm System
Do one of the following 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 on the RKE
transmitter and the horn chirps three
times, an alarm occurred previously
while the alarm system was armed.
If the alarm has been activated, a
message will appear on the DIC.
Immobilizer
See Radio Frequency Statement
0 350.
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 transmitter
leaves the vehicle.
The immobilization system is
disarmed when ENGINE START/
STOP is pressed and a valid
transmitter is in the vehicle.
The security light in the instrument
cluster comes on when there is a
problem with arming or disarming
the theft-deterrent system.
The system has one or more
transmitters matched to an
immobilizer control unit in the
vehicle. Only a correctly matched
transmitter will start the vehicle.
If the transmitter is damaged, the
vehicle may not start.

Buick Regal Owner Manual (GMNA-Localizing-U.S./Canada-13557849) -
2020 - CRC - 6/25/19
Keys, Doors, and Windows 31
When trying to start the vehicle, the
security light comes on briefly when
the ignition is turned on.
If the vehicle does not start and the
security light stays on, there is a
problem with the system. Turn the
vehicle off and try again.
If the RKE transmitter appears to be
undamaged, try another transmitter,
or place the transmitter in the
transmitter pocket. See“Starting the
Vehicle with a Low Transmitter
Battery” underRemote Keyless
Entry (RKE) System Operation 08.
If the vehicle does not start with the
other transmitter or when the
transmitter is in the transmitter
pocket, the vehicle needs service.
See your dealer who can service
the theft-deterrent system and have
a new transmitter programmed to
the vehicle.
Do not leave the transmitter or
device that disarms or deactivates
the theft-deterrent system in the
vehicle.Exterior Mirrors
Convex Mirrors
{Warning
A convex mirror can make things,
like other vehicles, look farther
away than they really are. If you
cut too sharply into the right lane,
you could hit a vehicle on the
right. Check the inside mirror or
glance over your shoulder before
changing lanes.
The passenger side mirror is convex
shaped. A convex mirror's surface is
curved so more can be seen from
the driver seat.
Power Mirrors
To adjust a mirror: 1. Press
jor|to select the
driver or passenger side mirror.
The indicator light will
illuminate.
2. Press the arrows on the control pad to move the mirror in the
desired direction.
3. Adjust each outside mirror so that a little of the vehicle and
the area behind it can be seen.
4. Press
jor|again to
deselect the mirror.

Buick Regal Owner Manual (GMNA-Localizing-U.S./Canada-13557849) -
2020 - CRC - 6/25/19
38 Seats and Restraints
Seats and
Restraints
Head Restraints
Head Restraints . . . . . . . . . . . . . . . 39
Front Seats
Seat Adjustment . . . . . . . . . . . . . . . 41
Power Seat Adjustment . . . . . . . . 42
Lumbar Adjustment . . . . . . . . . . . . 43
Thigh Support Adjustment . . . . . 43
Reclining Seatbacks . . . . . . . . . . . 44
Memory Seats . . . . . . . . . . . . . . . . . 45
Heated and Ventilated FrontSeats . . . . . . . . . . . . . . . . . . . . . . . . . 48
Massage . . . . . . . . . . . . . . . . . . . . . . . 49
Rear Seats
Rear Seats . . . . . . . . . . . . . . . . . . . . 50
Seat Belts
Seat Belts . . . . . . . . . . . . . . . . . . . . . 52
How to Wear Seat Belts Properly . . . . . . . . . . . . . . . . . . . . . . 53
Lap-Shoulder Belt . . . . . . . . . . . . . 55
Seat Belt Use During Pregnancy . . . . . . . . . . . . . . . . . . . . 57
Seat Belt Extender . . . . . . . . . . . . . 58
Safety System Check . . . . . . . . . . 58 Seat Belt Care . . . . . . . . . . . . . . . . . 58
Replacing Seat Belt System
Parts after a Crash . . . . . . . . . . . 59
Airbag System
Airbag System . . . . . . . . . . . . . . . . . 59
Where Are the Airbags? . . . . . . . 61
When Should an AirbagInflate? . . . . . . . . . . . . . . . . . . . . . . . 62
What Makes an Airbag Inflate? . . . . . . . . . . . . . . . . . . . . . . . 63
How Does an Airbag Restrain? . . . . . . . . . . . . . . . . . . . . . 64
What Will You See after an Airbag Inflates? . . . . . . . . . . . . . . 64
Passenger Sensing System . . . 65
Servicing the Airbag-Equipped Vehicle . . . . . . . . . . . . . . . . . . . . . . . 70
Adding Equipment to the Airbag-Equipped Vehicle . . . . . 70
Airbag System Check . . . . . . . . . . 71
Replacing Airbag System Parts after a Crash . . . . . . . . . . . . . . . . . 71
Child Restraints
Older Children . . . . . . . . . . . . . . . . . 72
Infants and Young Children . . . . 73
Child Restraint Systems . . . . . . . 76
Where to Put the Restraint . . . . . 77
Lower Anchors and Tethers forChildren (LATCH System) . . . . 78 Replacing LATCH System Parts
After a Crash . . . . . . . . . . . . . . . . . 85
Securing Child Restraints (With the Seat Belt in the
Rear Seat) . . . . . . . . . . . . . . . . . . . 86
Securing Child Restraints (With the Seat Belt in the
Front Seat) . . . . . . . . . . . . . . . . . . . 88
Pedestrian Protection System
Pedestrian ProtectionSystem . . . . . . . . . . . . . . . . . . . . . . . 90