Duplicate post but might save someone some time so...

I finally got mine figured out and it is embarrassingly simple... I'm not sure where I first heard it but the problem with the DEI (or similar) type bypasses, everyone else uses on almost every other system, is that they use a rolling resistance... The H3 has no possibility of working with this setup because it requires both a constant and accurate resistance... What’s more, each one is different so the installer will simply have to measure your resistance as you fire the key... Once you know it, you can use the two relays and the proper resistance resistor (almost exactly what's in the bypass) in place of the bypass and it will work... We did mine yesterday and I have tested it over and over in every possible alignment...

The way you will know you have it right is when you can lock it with the factory remote and remote start it causing 1 beep of the horn... That is exactly what will happen if you trip the alarm while using the key to start it... (lock the door with the factory remote while the window is down and reach in to start it with the key while still locked)... This is the only setup that worked after 7 failed attempts... DEI will undoubtedly be putting it out soon or will defeat the rolling resistance problem it has with the H3's...

 

take it to a new shop