howie
(aka: harryharris)

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Joined: February 17, 2014
Location: Florida, United States
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Because the iDatalink module syncs with the factory alarm, it should still give you the horn beep with lock/unlock. I don't know if the Viper will set off the factory alarm if it triggers. And for that, I recommend connecting the siren.
You can use aux channels to automate just about anything. As far as creativity goes, think of something and post a thread, we can't be creative for you!
Every car is different, and certain things rely on a certain skill level. For example, automating a trunk opening with an actuator would require some mechanical and electrical knowledge.
Aux channels only output 500mA. This isn't enough to power anything except a relay. So to answer your question, it doesn't draw off the +12V constant. Your relay would, however. Your dome light shouldn't be triggered by an aux channel though. It should be triggered by the dome light wire.
The car has separate circuits. For example, it has Ignition, Starter, and Accessory. The ignition handles the engine, the starter handles the starter, and the accessory handles anything that isn't required to start the car, for example, the radio, climate control, cigarette lighters, etc.
Controlling the climate control with the remote start does require a certain level of electrical skill. You won't be able to change the temperature though. You can use relays to bypass the current setting of a physical knob. Good chances are, you won't find a writeup on it, and the project would be fully custom. You'd have to meter the wires and cut wires and make your connections where needed. It would require a significant amount of relays to put a 'hot' or 'cold' setting on an aux channel. I have done this on my older Saab, and it was a pretty intense project. It's just easier to set the knobs before you go in for the night.
You can see this here: http://www.xpresskit.com/DocumentDownload.aspx?documentid=7734&productid=553&firmwareid=5298
You need Installation 1.
The T-harness isn't going to work for this car.