Spun

iTrader: (1)

Ok so if I don't explain this well, sorry but its all a little greek to me.

In my cobalt there are 2 modules by the ignition , one is for the passkey system and the other is to supply voltage to the ignition itsself.
The problem is that the ignition one is only putting out 1.5 volts rather than the 12 I thought it should.
I took it to GM and they sayed that when you cycle the key its normal for the voltage to drop from 9 volts to as low as 1 volt.
This sounds suspect to me.
Are they telling me the truth or am I getting for the old spit lube

EmperorJJ1

iTrader: (5)

for an alarm?

07MONTECARLO_SS

most switches run on a 1 to 5 volt reference signal. there may only be a 5volt max at that connector

Spun

iTrader: (1)

Yea its for the remote start

EmperorJJ1

iTrader: (5)

what did you tap to get the ign?

Halfcent

To answer your original question, voltage from supplies never varies. 12 volts is always 12 volts, unless the alternator is running, in which case its 14.5, but you get the point. If a voltage varies, then it's a signal wire, not a supply wire.

Spun

iTrader: (1)

I don't know how exactly he did it. I think I remember him saying he had to run a wire directly for it amnd had to do the same for the tach as well.
It would make sense that it would be a signal not a supply wire, it is for the remote start on the alarm.

The other problem we are running into is the Cobalt BCM is like the old Corvette's. The BCM will actually go into a sleep mode sometimes, so when you hit the button to disarm the car, it only unlocks one door. When in sleep mode it needs one pulse to wake it up and then one pulse to open the door, same goes for arming it so sometimes it will not lock the passenger side door,
I wish I would have taken the time to learn more about alarms, or better put the changes in alarms over the last few years. I had a good grasp of how the older ones worked, (Clifford Saber II, Black Widow, Era) but these new ones are juist killing me

EmperorJJ1

iTrader: (5)

I'm not sure if its the alarm or really the car.... could be a mix of both but i have herd cobalts are a difficult car

Spun

iTrader: (1)

Oh no its the damn car.
They have changed every componet in the alarm to whole new one, including the brain and yet its still a problem. If what GM said is correct I don't think tthe remote start will ever work the way its ment to.
The alarm part of it is fine, infact its a great alarm, I can call them up and have them open the doors if I lock my keys in the car, It works from huge distances and the LCD is very user friendly.
So maybe I'll pull out the start feature and have them put the window roll up modules in.

EmperorJJ1

iTrader: (5)

lol that would be pretty sweet. I would go compustar but im cheap and no one at the shop wants to touch my car with a 10ft poll when i say remote start