2002 dodge grand caravan sport

I hope I am doing the right forum and the right location.  I recently purchased a '02 Dodge Grand Caravan Sport it did not come with the rke option (Remote Keyless Entry). The Dealer said it was a $300 and up to $500 option. like no way am I going to spend that kind of cash. so here is the big question... I already have the Autopage RF-315 and just a couple of day's ago bought the Chilton manual for it. I have seen a post which includes some wiring cconfigurations but I am really confused at this point, according to my alarm connection(s) I have a 3 pin +/- pulse connector which makes need at least (2) 30amp spst relays there are 4 doors. could someone help me with this I don't want to burn up my bcm as they start at $200 and up.

Doors automatically lock in gear at 20 mph

Thanks Techman97.

Would you know where to find the hatch trigger so I can connect the theater interior lights?

I am only assuming this vehicle does not have a electrical hatch release since there is no button to push anywhere on the inside.

Here is a picture of another diagram...why wouldn't this one work, I like the idea of having only one constant input not two where they have to cross and a waste of wire.

http://www.bulldogsecurity.com/New%20Wires/New%20Wires/Wires/images/2001chrymvlocks.htm