Conventional vehicle access systems consist of radio transmitter keys and receivers. Active button control can be used to activate a range of comfort functions, e.g. locking or unlocking vehicle doors or the trunk. An active radio remote control typically has a range of up to 100 m. The radio remote control signals are sent to the receivers in the ECU.
The latter evaluates the signals and also handles other functions.
The passive entry/go system ensures that the vehicle detects the approaching person using the ID transmitter.