Wire up to the 20p round diagnostic connector like this:

20 = TXD+ D-Bus databus, also known as K-Line 2
19 = SGND Signal ground
2 = +12Vign Ignition power KL15 via 5A fuse

You need to have an OBD-enabled version of NavCoder, it is not yet in public release, but if you wish to help test, email me.