Donald, unfortunately, you don't have an option here. The VSS "wire" is really a packet of data that is put on the CAN bus of the car and shared around the vehicle to all the computers. There is no wire that runs from say the ABS unit to the instrument cluster that would have the vehicle speed on it.

With this being said, there should be a module that you can plug into the OBD port that would allow you to pull off the VSS data and then feed that over to the radio. But then, I would try running the radio without the VSS signal and see how "bad" it really is. I don't think you are going to see any real negative effects. Even if the system is off by say 50 feet, I think you can make up that difference when it comes to roads.

 

 

Donald, the speed that the vehicle is traveling at can be obtained from the GPS information. Normally they will require a VSS signal to disable any sort of "video in motion" features. They may put it under the disguise of better performance, but ultimately it is a legal issue of a driver watching a video as they are driving and causing a crash. I would try the radio without the VSS signal and see what happens.

Look at it this way, some GPS units tell you how fast the vehicle is going and they have no input from the car.

I double checked the schematics. The ABS unit has no output for VSS signal. It is put on the CAN bus for use. So, as I mentioned before, unless you get a module that plugs into the OBD port to obtain the info that way, you are not going to be able to obtain it. The only other option is to get into the instrument cluster to obtain the signal that drives the speedo. But, odds are, that will not be a useful signal for the radio to use to figure out speed as my experience is that the VSS signal is a variable DC voltage and the instruments use a pulsating signal to drive them (pulse width modulation).