passenger seatbelt no longer pulls out. it is stuck fully retracted on 1998 Mercedes-Benz SL500

passengers in my car can`t use seatbelt anymore. only one freak time has it worked in the last year.

Asked by for the 1998 Mercedes-Benz SL500
poss debris in retactor or spring is broken seek halp due to its hooked up to module for collisions