Mercedes-Benz 2002 SLK 230 Kompressor Operator's Manual page 211

Instruments Instrument Technical
Operation Driving Practical hints Car care Index
and controls cluster display data
Tires, wheels 208
4. Using the wrench, loosen but do not yet remove the 5. Remove the protective cover from the jack support
wheel bolts. tube opening by inserting the screwdriver (supplied
in the tool kit) in the opening and prying it out.
The tube openings are located directly behind the
front wheel housings and in front of the rear wheel
housings.