Keyless Entry System - E-Class & C-Class: Description
To improve convenience of operation, central locking system and anti-theft warning system can be operated by an infrared transmitter in key head. In addition, any side windows which may have been left open can be closed or opened again within 10 seconds after locking with central locking system.
All processes are displayed by indicator lamps. When transmitter batteries are fully charged, remote control is possible up to a distance of 6 meters, remote control of convenience feature is possible up to a distance of 3 meters. The receivers are located at locking cylinder of driver's door and trunk lid. See Fig 1 . The front passenger's door only has a mechanical locking cylinder.