Mazda 3 2019 Owner's Manual page 452

Maintenance and Care
Owner Maintenance
The following conditions indicate that the
battery power is low:
The KEY warning indication/warning

light (red) in the instrument cluster turns
on and a message, "Low Key Fob
Battery. Replace Battery", is displayed
on the multi-information display when
the ignition is switched OFF.
The system does not operate and the

operation indicator light on the
transmitter does not flash 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.
Replacing the key battery
1. Remove the lower cover while
pressing the knob in the direction of
the arrow.
6-28
2. Press in the tab to unlock the upper
cover.
3. Insert a tape-wrapped flathead
screwdriver into the gap and slide it in
the direction of the arrow.
4. Twist the flathead screwdriver in the
direction of the arrow and remove the
upper cover.