In contrast to the previous versions, the speed signals are supplied by four "active" speed sensors.
The ABS control unit supplies the voltage to the speed sensors (7.6...8.4 V direct voltage) as from ignition lock position 2.
The speed signals are square-wave signals with constant amplitude (low level = 0.75 V, high level = 2.5 V). The frequency is dependent on the wheel speeds and is within the range from 0 to 1700 Hz (0 to 250 km/h).