Mazda 3 Owner's Manual page 85

Before Driving
Doors and Locks
NOTE
When the ignition is switched to ACC
or ON, the vehicle lock-out prevention
feature prevents you from locking
yourself out of the vehicle.
All doors and the liftgate/trunk lid will
automatically unlock if they are locked
using the power door locks with any
door open.
The vehicle lock-out prevention feature
does not operate while the ignition is
switched off.
When any door is opened from the
outside while the key is inside the
vehicle, the closed doors are locked. All
the doors are automatically unlocked by
closing the open door.
(With the advanced keyless function)
The beep sound is heard for about 10
seconds to notify the driver that the key
has been left in the vehicle.
(Without the advanced keyless
function)
The horn sound is heard twice to notify
the driver that the key has been left in
the vehicle.
3–12
(Door unlock (control) system with
collision detection)
This system automatically unlocks
the doors in the event the vehicle
is involved in an accident to allow
passengers to get out of the vehicle
immediately and prevent being trapped
inside. While the ignition is switched
ON and in the event the vehicle
receives an impact strong enough to
infl ate the air bags, all the doors are
automatically unlocked after about 6
seconds have elapsed from the time of
the accident.
The doors may not unlock depending on
how an impact is applied, the force of
the impact, and other conditions of the
accident.
If door-related systems or the battery
is malfunctioning, the doors will not
unlock.
Locking, Unlocking with Key
All doors and the liftgate/trunk lid lock
automatically when the driver's door is
locked with the key.
All doors and the liftgate/trunk lid unlock
when the driver's door is unlocked and the
key is held in the unlock position for one
second or longer.
Turn the key toward the front to lock,
toward the back to unlock.
Unlock
Lock