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