Mazda CX-3 Owner's Manual page 163

Speedometer
The speedometer indicates the speed of the
vehicle.
NOTE
(Analog speedometer type)
If a few seconds have elapsed after
switching the ignition off, the needle
may deviate. However, this does not
indicate a problem.
Speed Unit Selector (Digital
Speedometer Type)
In some countries, you may have to
change the speed units between km/h and
mph.
Press the speed unit selector for 1.5
seconds or more.
The speed units for the speedometer will
change between km/h and mph.
Speed unit selector
*
Speedometer
Instrument Cluster and Display
Odometer, Trip Meter and Trip
Meter Selector
The display mode can be changed from
odometer to trip meter A to trip meter B
and then back to odometer by pressing the
selector while one of them is displayed.
The selected mode will be displayed.
Odometer
Press the selector
Trip meter A
Press the selector
Trip meter B
Press the selector
NOTE
When the ignition is switched to ACC
or off, the odometer or trip meters
cannot be displayed, however, pressing
the selector can inadvertently switch
the trip meters or reset them during an
approximate ten-minute period in the
following cases:
After the ignition is switched to off
    
from ON.
After the driver's door is opened.
   
When Driving
Selector
4–25
*Some models.