Not sure if this is plausable, but is there a wire in the navigation antenna that provides power that can be turned on and off via switch to toggle the navigation. My PB bypass worked great until the navigation speed tripped it again. I would like to turn off the navigation antenna when I need the other options, then turn it back on after I finish without having to rip out the radio to unplug it.

Anyone have knowledge of how the wiring is setup to see if it's able to be tapped into like that?

If your bypass is not working then it is defective. No need to try and reinvent the wheel here.

It is not working due to the navigation feature. The bypass might have worked fine with the 930, but doesn't work correctly with the 940.

Yes it does and there are many people using it. If yours isn't working you either did it wrong or you have a loose wire.