I'll try to post some info I have gathered on this in the past. Understand, this is all from notes I've written and while I can't guarantee that it works (I have not installed a TNR yet) it is from reliable sources.
Bear with me because this is from WRITTEN notes. One of the few times I've written notes instead of typed them into Word or something.
Ok, there might be a way to temporarily test to make sure you are all plugged up and working:
<UL TYPE=SQUARE>1) Turn key to ACC position (not run)
2) Wait for "theftlock" screen to appear
3) Pull radio fuse
4) Put radio fuse back in
5) Radio will work until the key is turned off or you try to start the vehicle[/list]