superbob1

I was wondering if anybody else has tried this? Right now I have an N2 w/ a N3 brain and it works great, but when I hook up the N4 brain the screen stay black and none of the buttons work. But I do hear it processing, any help or foresight would be appreciated.

Ok so far this is what I have: N2 bypassed with the circuit pen. The problem is: when i start the car I am still getting the message. I am grounded when i start the car, then the message pops up. Then I unground it and reground it and it works perfectly. This is the idea of a switch, but I thought once you did the bypass you wouldn't have to use a switch? Any help would be much appreciated. I have spent the last 24 hrs reading posts to see if I could get help without having to write a question and annoy anybody.