GM product ?

Just a shot in the dark, but did you connect the neutral safety switch? And did you try diagnosing with the safety switch wire grounded?

CutDog504 wrote: Just a shot in the dark, but did you connect the neutral safety switch? And did you try diagnosing with the safety switch wire grounded?

CutDog504, thanks for the long shot, but no, I never have done a vehicle with a VATS system that requires neutral safety switch. I don't see the reason behind it, but it is worth another look if I ever encounter something like this again. My reasoning here is that I have done many cars with the VATS and along with the wiring program that I use, it never suggest that I will need the neutral safety switch, so I can't seem to be convince that would be the cause. The only logical explaination I can think of is a bad resistor with a sensitive VATS system.   My question to any one who is familar with GM VATS is, if the VATS is trip with the incorrect resistence. Will you still be able to crank the starter or the entire system completely shut down? If someone has hot wire and trip one of these I would love to know because I haven't. It would really help explain why the remote starter power off without any chance of cranking the car. Be careful whose advice you buy, but be patient with those who supply it.

Is it possible to put the unit in voltage sense mode instead of tach sensing? If so, I would try using that and see what the results are.

JWorm, I thought it was a tach issue too, but I ran in to an Accord that had a tach issue, only thing there is that it would allow the starter to crank for a period before shutting down. This situation, the unit didn't even have a chance. As soon as it goes on, it goes off immediatly. Autostart has tach sense only and was learned by the unit.    Be careful whose advice you buy, but be patient with those who supply it.

Did you use either the PURPLE / white or white at the coil pack for tach? I have seen some units react strangely to using the PURPLE / white. It may meter fine, and the unit may learn the signal but for some reason it causes problems. I suggest using the white.

I took white, Astro, Direct, Omega had white. 2.2 volts.   Be careful whose advice you buy, but be patient with those who supply it.

Well this may sound dumb but are both of your constants getting 12 volts? Just an idea..

Yes, both are getting 12.43V.    Be careful whose advice you buy, but be patient with those who supply it.

So the output on the remote start tries to power the starter wire but nothing happens? hmmm.. Heres a test for ya, try just running the resistor for the vats from bcm side to the uncut vats wire. This permanetly bypasses the vats. If it starts like this with key then the remote start should work. Just another idea.

Power up then off right away. This is the second car I got stump on. I will do that if I encounter this again. Maybe a bypass module first before your suggestion. I didn't have more time to try thing further because customer needed the car back and I do understanding. Patient and confident will wear off after a long wait, so none the less it is people you are dealing with here. Some are better understanding than other.        Be careful whose advice you buy, but be patient with those who supply it.