Kia Sportage: To unfasten the rear center belt
1.Press the release button on the buckle (D) and remove the tongue plate (B) from the buckle (D).

2.To retract the rear center seatbelt, insert the tongue plate or similar small rigid device into the web release hole (C). Pull up on the seat belt web (A) and allow the webbing to retract automatically.

3.Insert the tongue plate into the hole on the belt assembly cover.

3 Point rear center belt
Stowing the rear seat beltTrailing Arm: Repair procedures
Replacement
1.
Remove the rear wheel & tire.
Tightening torque :
88.3 ~ 107.9N.m (9.0 ~ 11.0kgf.m, 65.1 ~ 79.6lb-ft)
Be careful not to damage to the hub bol ...
Injured person
A seat belt should be used when an injured person is being transported. When
this is necessary, you should consult a physician for recommendations. ...