Slip Ring Assembly
WARNING: This page is about a different car, the 1993 Mercedes-Benz 500SEL and 1993 Mercedes-Benz 500E. However, it is still accessible from the selected car via links, so may be relevant.
Slip ring assembly is mounted to bottom side of steering wheel. The slip ring assembly ensures positive electrical connection between SRS control unit and air bag module when used in conjunction with carbon contacts mounted in steering column. Carbon contacts constantly rub against slip ring surfaces on bottom of steering wheel.