Speedometer

The Vehicle Speed Sensor (X190) sends a signal to the speedometer in the form of voltage pulses. The pulses are filtered by a Vehicle Speed Sensor Buffer inside the speedometer. The voltage alternates between battery voltage and 0 volts 6 times per wheel revolution. The speed sensor signal is also sent to the Cruise Control ECU (z121), Engine Control Module (Z132), Memory Seat ECU (Z146), Air Suspension ECU (Z165), the Service Reminder Unit (NAS) (Z126), and the Multifunction Unit (MFU) (Z148) (Persian Gulf Countries).