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Wheel speed

Wheel speed



The ABS electronic control module receives information concerning each wheel speed from the sensors on each wheel. The other systems in the vehicle that require information about the vehicle speed receive it from the ABS electronic control module. The ABS electronic control module receives vehicle speed information from the wheel sensors in the form of AC voltage of varying frequency. The AC voltage is processed in the electronic control module to four edged pulses that are transmitted to the following points. Pin 26 transmits a speed signal from the front right wheel to:


• MOTRONIC 2.10.3

• Motoronic 2.8.1

• Motronic 5.2

• Motronic 4.1

• Trionic

• TCS

Pin 25 transmits a speed signal from the front left wheel to:


• CC (Cruise control)

• TCS

Pin 24 transmits a speed signal from the rear right wheel to:


• TCS

• Cabriolet

Pin 23 transmits a speed signal from the rear left wheel to:


• MIU (Speedometer)

• TCS

• Sensonic

If the voltmeter measurement is taken on one the pins concerned, the value should change between 0V and approx. 12V when the respective wheel is slowly rotated. The signals are also transmitted when the ABS is out of operation and when the ABS lamp is on.