Mazda 3 2016 Manual page 445

The following conditions indicate that the
battery power is low:
The KEY indicator light (green) ashes
in the instrument cluster for about 30
seconds after the engine is turned off.
The system does not operate and
the operation indicator light on the
transmitter does not ash when the
buttons are pressed.
The system's operational range is
reduced.
Replacing the battery at an Authorized
Mazda Dealer is recommended to prevent
damage to the key. If replacing the battery
by yourself, follow the instruction below.
Replacing the key battery
1. Press the knob and pull out the
auxiliary key.
Knob
Owner Maintenance
2. Twist a tape-wrapped athead
screwdriver in the direction of the
arrow and open the cover slightly.
Cover
3. Insert the tape-wrapped athead
screwdriver into the gap and slide it in
the direction of the arrow.
Cover
4. Twist the athead screwdriver in the
direction of the arrow and remove the
cover.
Cover
Maintenance and Care
Gap
6–41