From inside (document excerpt):
Owner’s manual for Mercedes-Benz C-Class models C 240 and C 320. W203 Operator’s Manual Download.
Introduction
Product information
Operator’s manual
Where to find it
Reporting Safety Defects
Instruments and controls
Door control panel
Overhead control panel
Dashboard
Center console
Operation
Vehicle keys
Start lock-out
General notes on the
central locking system
Central locking system
Radio frequency and infrared remote control
Locking and unlocking
Choosing global or selective mode on remote control
Opening the trunk
Opening and closing windows and sliding / pop-up roof from outside
Panic button
Mechanical keys
Doors
Central locking switch
Automatic central locking
Emergency unlocking
in case of accident
Trunk