GMC 2009 Sierra - Manual (Page 87)

There are several ways to lock and unlock your vehicle.
From the outside, use the Remote Keyless Entry (RKE)
transmitter or the key in the driver’s door.
From the inside, use the power door locks or manual
door locks. To lock or unlock the door with the manual
locks, push down or pull up on the manual lock knob.
Power Door Locks
The power door lock switches are located on the front
doors.
K
(Unlock): Press to unlock the doors.
Q
(Lock): Remove the key from the ignition and press
to lock the doors.
Delayed Locking
When locking the doors with the power lock switch or
the Remote Keyless Entry (RKE) transmitter and a door
is open, the doors will lock five seconds after the last
door is closed. You will hear three chimes to signal that
the delayed locking feature is in use.
Pressing the power lock switch twice or the lock button
on the RKE transmitter twice will override the delayed
locking feature and immediately lock all the doors.
This feature will not operate if the key is in the ignition.
You can program this feature using the Driver
Information Center (DIC). See DELAY DOOR LOCK
under DIC Vehicle Customization (With DIC Buttons) on
page 3-68.
Programmable Automatic Door
Locks
Vehicles with an automatic lock/unlock feature enable
you to program the vehicle’s power door locks. You can
program this feature through the Driver Information
Center (DIC). See DIC Vehicle Customization (With DIC
Buttons) on page 3-68 for more information on DIC
programming.
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