you could buy a can usb device, which is an adapter that reads can bus messages and sends em over a usb cord. then with a computer / laptop log and record all messages from your car while your nav starts up. then you can plug the nav info your computer and play back the recorded messages and it should start up.
or instead of just recording and playback you could get the can usb and read on
CANHack.org | Help us help you gain access to your vehicles network! to find which message powers on the radio and send that one message to it using a computer and it should turn on. I know guys on that site have gotten a rec navigation system to work on a test bench, i just dont remember where on the site i read it.
can usb is about $150 US before shipping.
seems like alot of work to just get it workin on a test bench tho. where in Canada are you? I'm in Ottawa and I got a can usb coming (hopfully its in my mail box right now actually). If your in Ottawa Id be happy to plug it all in and see if it'll power on.
EDIT: Found a thread
http://www.canhack.org/board/viewtop...lit=bench#p822
again this might not be the best way since you gotta buy a can usb adapter and write a program to send the messages, etc. just a thought tho
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