Warning system for passive vehicle occupant restraint belts

A passive vehicle occupant seat belt system comprising a shoulder belt extending upwardly and outwardly across the vehicle seat from adjacent the inboard lower rear portion of the seat, a guide rail affixed to the edge of the vehicle roof generally above the door, a movable anchor received by the guide rail for movement between a restraint location adjacent the rear end of the guide rail and a release location adjacent the front end of the guide rail, means for moving the movable anchor between the release and restraint locations in response to closing and opening of the vehicle door, emergency release buckle means for releasably connecting the outboard end of the shoulder belt to the movable anchor, a fixed anchor adjacent the restraint location of the movable anchor and including a locking pawl adapted to lock the movable anchor at the restraint location, means for detecting the presence of the movable anchor at the restraint location and for producing a warning signal when the movable anchor is not at the restraint location, means for detecting when the pawl is disengaged from the movable anchor and for producing a warning signal thereof only when the movable anchor is at the restraining location, and means for detecting when the buckle is not fastened and for producing a warning signal indicative thereof only when the movable anchor is at the restraining location.