Depress the button on the seat belt buckle.
If the belt does not fully retract, pull it out and check for kinks or twists. Then make sure it remains untwisted as it retracts.

NOTE If a belt does not fully retract, inspect it for kinks and twists. If it is still not retracting properly, have it inspected at an Authorized Mazda Dealer.
Fastening the Seat Belt
Front Shoulder Belt AdjusterIon Sensor Inspection [Skyactiv G 2.0]
DTC Inspection
NOTE:
Because the ion sensor is integrated in the ignition coil, replacing the
ion sensor includes replacement of the ignition coil/ion sensor.
1. Connect the M-MDS to the DLC-2.
2. Perform the DTC inspection using the M-MDS..
If any DTC related to the ...
Climate Control Unit Removal/Installation [Full Auto Air Conditioner]
1. Disconnect the negative battery cable..
2. Remove the following parts:
a. Upper panel.
b. Shift lever knob (MTX).
c. Selector lever knob (ATX).
d. Shift panel.
e. Side wall.
f. Console.
g. Center panel.
h. Audio unit.
3. Remove in the order indicated in the table.
...
Operational Range
The system operates only when the driver
is in the vehicle or within operational
range while the key is being carried.
Starting the Engine
NOTE
Starting the engine may be possible
even if the key is outside of the vehicle
and extremely close to a door and
window, however, always start ...