Abstract: An interlock system for stopping seat belt payout from a retractor when a seat is not secured is provided. The interlock system includes a connector between the seat latch and the retractor with the connector operating a retractor locking actuator which utilizes the vehicle inertia sensor to cause retractor locking. In one form, the actuator is shifted into engagement with the inertia member for retractor locking when the seat is released. In another form, the actuator is mounted to a module secured on one side of the one of the retractor frame plates to which the actuating mechanism for the vehicle sensor is secured on the other side thereof. The connector causes shifting of the actuator member from the one side to the other to operate the vehicle sensor actuating mechanism for retractor locking when the seat is released.