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 AdjusterMazda 6 Owners Manual: Power window main switch inspection
Drivers side
1. Remove the driver-side front door trim.
2. Connect the power window main switch connector.
3. Measure the voltage at the power window main switch terminals as indicated
below.
4. Disconnect the power window main switch connector before inspecting for
continuity at terminals 1 ...
Mazda 6 Owners Manual: Seat Operation
1. Seat Slide
(Manual Seat)
To move a seat forward or backward, raise the lever and slide the seat to the
desired position and release the lever.
Make sure the lever returns to its original position and the seat is locked in
place by attempting to push it forward and backward.
(Power Seat) ...