Mercedes-Benz C-class Operator's Manual page 204

Storage compartment in front of armrest To open:
Slide cover (5) rearward.
To close:
Slide cover (5) forward.
Note:
The compartment contains a lighter (see page 201), a
coin holder, and a cup holder (see page 197).
5 Storage compartment in front of armrest
Interior equipment 195
Instruments Instrument Technical
Operation Driving Practical hints Car care Index
and controls cluster display data