CL-Class (C215) 1999-2006. SL-Class (R230) 2001-2011. S-Class (W220) 1998-2005. If you find your central locking becoming lazy or just malfunctioning it could be your vacuum pump impeller becoming split or broken, this could lead onto total failure of the unit, such as jamming the motor which in turn blow its 20A fuse.
