GMC Sierra 2500 HD2022 Owner's Manual page 16

Driver Side Shown, Passenger Side Similar
Pressing the lock/unlock button will cause
all doors to lock if any of the following
occur:
It has been more than five seconds since
the first lock/unlock button press.
Two lock/unlock button presses were
used to unlock all doors.
Any vehicle door has been opened and all
doors are now closed.
Keyless Unlocking/Locking from the
Passenger Doors
When the doors are locked and the RKE
transmitter is within 1 m (3 ft) of the door
handle, pressing the lock/unlock button on a
passenger door handle will unlock all doors.
Pressing the lock/unlock button will cause
all doors to lock if any of the following
occur:
The lock/unlock button was used to
unlock all doors.
Any vehicle door has been opened and all
doors are now closed.
Disable/Enable Keyless Unlocking of Exterior
Door Handles and Tailgate
If equipped, keyless unlocking of the exterior
door handles and tailgate can be disabled
and enabled.
Disabling Keyless Unlocking:
With the vehicle off, press and hold
on the RKE transmitter at the same time
for approximately three seconds. The turn
signal lamps will flash four times quickly to
indicate access is disabled. Using any
exterior handle to unlock the doors or open
the tailgate will cause the turn signal lamps
to flash four times quickly, indicating access
is disabled. If disabled, disarm the alarm
system before starting the vehicle.
Keys, Doors, and Windows
Enabling Keyless Unlocking:
With the vehicle off, press and hold
on the RKE transmitter at the same time
for approximately three seconds. The turn
signal lamps will flash twice quickly to
indicate access is enabled.
Passive Locking
This feature will lock the vehicle several
seconds after all doors are closed, if the
vehicle is off and at least one RKE
transmitter has been removed from the
interior, or none remain in the interior.
If other electronic devices interfere with the
RKE transmitter signal, the vehicle may not
and
detect the RKE transmitter inside the vehicle.
If passive locking is enabled, the doors may
lock with the RKE transmitter inside the
vehicle. Do not leave the RKE transmitter in
an unattended vehicle.
To customize the doors to automatically lock
when exiting the vehicle, see Remote Lock,
Unlock, Start under Vehicle Personalization
0 131.
Temporary Disable of Passive Locking
Temporarily disable passive locking by
pressing and holding
switch with a door open for at least
15
and
on the interior door