I looked at the schematics and it looks like it's programmed to not function when there is a speed signal coming in. You could probably set up a bypass, but it still might not work. Connector m24 pin 6(unified meter control unit) and m94/m95 (display control unit) pin 16 are the connections for the speed signal. The CAN network really makes it hard to bypass. You could always buy a Pathy without nav and put your own in.