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 AdjusterMass Air Flow (MAF) Sensor Inspection [Mzr 2.0, Mzr 2.5]
Visual Inspection
1. Remove the battery cover..
2. Disconnect the negative battery cable..
3. Disconnect the MAF/IAT sensor connector.
4. Remove the MAF/IAT sensor..
5. Visually inspect the MAF/IAT sensor for the following:
Damage, cracks, soiling
Rusted sensor terminal
...
Rear Crossmember Removal/Installation
CAUTION:
Performing the following procedures without first removing the ABS wheel-speed
sensor may possibly cause an open circuit in the wiring harness if it is pulled
by mistake. Before performing the following procedures, disconnect the ABS wheel-speed
sensor wiring harness connec ...
Trunk Lid Adjustment
1. Measure the gap and height difference between the trunk lid and the body.
Standard clearance
a: 2.4—4.4 mm {0.10—0.17 in}
b: -4.6—-2.6 mm {-0.18—-0.11 in}
c: 2.5—4.5 mm {0.10—0.17 in}
d: -1.7—0.3 mm {-0.06—0.01 in}
e: 2.6—4.6 mm {0.11—0.18 in}
...