![]() Your vehicle’s cruise control uses the VSS wire to determine the vehicle’s speed - it serves the same function for the navigation system. In addition to the standard power and ground leads, remote-mount navigation (and even some in-dash units) systems connect to a vehicle’s Vehicle Speed Sensor (VSS) wire. The other 2 are not used but the VSS wire is the brown wire located on the larger of the 2 connectors not being used.ĭefinition: V ehicle Speed Sensor (VSS) via Crutchfield Only 2 of the 4 connectors are used with your new aftermarket radio which are the 2 connectors with the larger size pins. When you remove your OEM radio, there are 4 plugs that plug into the radio.
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