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 AdjusterBattery Removal/Installation [Mzr 2.0, Mzr 2.5]
1. Remove in the order indicated in the table.
2. Install in the reverse order of removal.
1
Battery cover
(See Battery Cover Removal Note.)
(See Battery Cover Installation Note.)
2
Negative battery cable
3
...
C Pillar Trim Removal/Installation
4SD
1. Remove the following parts:
a. Rear seat cushion.
b. Rear scuff plate.
c. Tire house trim.
2. Partially peel back the seaming welt.
3. Pull the C-pillar trim in the direction of the arrow (1), (2) shown in the
figure, then detaching clip A and B.
4. Cut the lead wire connec ...
Stop Vehicle in Safe Place Immediately
If any of the following warning lights turns on, the system may have a
malfunction. Stop the
vehicle in a safe place immediately and contact an Authorized Mazda Dealer.
...