Autostart, 05 Grand Prix

I am having the same issue. 04 grand prix. Installed a ultra u1270tl with dei 556u bpyass. Works great occassionaly service theft system soon light comes on. Keysense is hooked up. The car is returning tomorrow for another shot at the problem.. Anybody no how to correct  this one, I have been over the wiring in this car quite a few times switched out brain and bypass, nothing fixed it yet.

I talked to Mike (bypasskit.com) about this problem. He suggested taking a look at the interface again. Make sure the interface is not getting 12v constant. It should be on ignition.

Someone on here suggested running a new wire to loop around but thinner like phone line thin.

I'll add a relay to the keysense and wire the bypass off ignition today. I'll post results in a couple of days..

Thanx for the help,  hopefully this fixes it = happy custy

You have a scanner? If so you should be able to get the codes out. I think they were in the BCM. You can clear it also from there. If not then try disconnecting the battery.

You hooked the interface up to GWR and ign. output from the remote start?

I don't have a scanner. I hooked red wire to ign. 2 output and ground out when running is hooked up. Dei tech called back while typing, said to tie ground out when running into keysense and to diode isolate it? Also said transponder ring was in the wrong place needs to be glued to factory ring. That is where the ring is now, always been there.  I'll try disconnecting battery though. Have you heard of this advice dei gave about tieing in keysense and ground out when running??

I have not heard of that. As a matter of fact I talked to Mike today and it came up again. He said so far everyone he has talked to has changed the wires to 12v igntion and GWR outputs from the unit. He said nobody has called him back saying it still was doing it.

In the ones I have done the wire is looped around the cylinder just behind the plastic ring about 4-6 times.  I have 1 (the one so far to come back) that has an autostart in it and the 2 others have omega systems in it with pku-gm interfaces for all.  The one with issues has been in for a year  almost.  The 2 others just within a few months.

I think next week I am going to get the one back in to take another look at it and see about changing it if I see something. Also when it is here I will be talking with Mike and trying a few things out.  If you have questions call him 1-888-745-6449 tech support and ask for Mike.  Tell him you were talking with Kenny about this. He will know.

Let me know if those ideas worked or not.  All they are talking about is that your basicly making it think there is a key in it when there isnt. But many people here tried powering the keysense with nothing changing.  Same with the Uplanders.