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Before powering a digital dashboard, the VSS was used to regulate the cruise control and control transmission shifts. Now, depending upon vehicle equipment, the VSS may influence or control more systems than any other single sensor. Two different types of VSS are used. The optical VSS, which first appeared on General Motors vehicles in the 1980s, works off a conventional speedometer cable. The later style is the permanent magnet or “magnetic impulse” design. An optical VSS is located inside the speedometer head at the back of the instrument panel. It uses a photo cell, light-emitting diode (LED), and a two-blade, mirrored reflector to generate an electrical signal.
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