The reason for the entrance to the rear of the Opel Corsa D passenger compartment is the steel triangular arm of the rear seat belt. When the bolts securing the arm, the constant shaking is partially unscrewed, there is a knock at the saloon. To fix the problem, you need to remove the plastic upholstery, screw the bolt, insert a thin rubber puck between its head and arm, and tighten the screws.
