Mazda 3 Owner's Manual page 608

If Trouble Arises
Warning/Indicator Lights and Warning Sounds
Seat Belt Warning Beep
Front seat
If the vehicle speed exceeds about 20
km/h (12 mph) with the driver or front
passenger's seat belt unfastened, a warning
beep sounds continuously. If the seat belt
remains unfastened, the beep sound stops
once and then continues for about 90
seconds. The beep stops after the driver or
front passenger's seat belt is fastened.
NOTE
Do not have the seat belt warning
beep for the front passenger's seat.
Placing heavy items on the front
passenger seat may cause the front
passenger seat belt warning function
to operate depending on the weight
of the item.
To allow the front passenger seat
weight sensor to function properly,
do not place and sit on an additional
seat cushion on the front passenger
seat. The sensor may not function
properly because the additional
seat cushion could cause sensor
interference.
When a small child sits on the front
passenger seat, it is possible that the
warning beep will not operate.
Rear seat
The warning beep only sounds if a seat
belt is unfastened after being fastened.
*
7–50
Some models.
Ignition Not Switched Off (STOP)
Warning Beep
If the driver's door is opened while
the ignition is switched to ACC, a
continuous beep sound will be heard to
notify the driver that the ignition has not
been switched off (STOP). Left in this
condition, the keyless entry system will
not operate, the car cannot be locked, and
the battery power will be depleted.
Key Removed from Vehicle
Warning Beep
A beep sound will be heard 6 times and
the KEY warning light (red) will fl ash
continuously if the ignition has not been
switched off, all the doors are closed, and
the key is removed from the vehicle. This
is to notify the driver that the key has been
removed from the vehicle and the ignition
has not been switched off.
NOTE
Because the key utilizes low-intensity
radio waves, the Key Removed From
Vehicle Warning may activate if the key
is carried together with a metal object
or it is placed in a poor signal reception
area.
Request Switch Inoperable
Warning Beep (With the advanced
keyless function)
If the request switch is pressed with a door
open or ajar or the ignition has not been
switched off while the key is being carried,
a beep will be heard for about 2 seconds to
indicate that the doors and the liftgate/boot
lid cannot be locked.
*