Remote control or identification signal
The remote key is the key for the central locking system. The remote-control unit can be used to unlock and lock or deadlock the vehicle with radio-frequency signals (radio interface).
The ID transmitter serves as the key in vehicles with Comfort Access. If the vehicle is equipped with Comfort Access, the vehicle can be unlocked or locked without active use of the ID transmitter and the engine can be started.
The remote key is described in the text below. The description also applies to the ID transmitter.
When the unlocking or locking button is pressed on the remote key, it transmits an encrypted radio signal. The RCS aerial (RCS stands for "Remote Control Services") forwards the remote control signal to the remote control receiver.
The remote control receiver has a transmitter/receiver module. This enables bidirectional communication to be established between remote key and remote control receiver. The radio signal is then demodulated, processed and checked in the remote control receiver. That means: The radio signal from the remote key contains a vehicle-specific constant "value" which is checked by the remote control receiver. This information is only passed down the direct line connection to the Car Access System (CAS) if this value is correct. This means: Radio signals from remote keys for other vehicles (including from the same product line) will not 'wake up' the Car Access System.
Authentication of the remote control signal is then performed within the Car Access System. If the request is duly authorized, the Car Access System wakes up the vehicle and either locks or unlocks the vehicle, as appropriate.
The following components are unlocked or locked:
- Doors
- Tailgate
- Fuel filler flap