Mazda 3 2020 Owner's Manual page 520

Maintenance and Care
Owner Maintenance
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.
5. Remove the cap using the
tape-wrapped flathead screwdriver.
6. Remove the battery using
tape-wrapped flathead screwdriver.
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7. Insert a new battery into the
transmitter so that the positive pole
is facing up.
8. Install the cap.
9. Install the upper cover.
10.Insert the tabs of the lower cover
into the slots of the transmitter and
install the lower cover.