Need help. I have a base model roadster and is trying to locate the speed sensor wire. I read one of the post on this forum that stated is the one of the wires attached to the amplifier. The base model does not have an amplifier. I had a local installer install the JVC KD-Nx5000 head unit with the DVD player, blue tooth and navigation system. Everything works except for the navigation system. I think the problem is that the unit is not connect to the speed sensor wire. If any one has any ideas or know the location of the speed sensor wire I would appreciate your help. I have a 2005 base model roadster.

Thanks,
Robert