I see that there is a black/white wire in the radio harness that adjusts the radio volume due to speed. I connected to this wire and did not get a speed pulse. Could this be a positive pulse and the nav wants to see a negative pulse? I would prefer to not tap into the ABS system if possible. I keep thinking that there should be one there in case you got the factory nav.
P.S. I moved this nav from a Camry that had the speed pulse wire connected and the accuracy was much better. It will now show my position in the BMW a block or even two away from where I am.
Thanks Again
Dave