15 pound solenoid is going to cook in no time for the door.  Second, you'll need to wire it in like so: 
negative in is from your remote, the positive is to your solenoid.  Make sure you fuse the +12 constant, and like I said before, the 15 pound is not going to cook quickly.
 
 
That still won't be enough, 15 pound is good for a trunk, not a car door.  Get at least some spal 40 pound solenoids, if not 50 pound ones.
 
 
all the pics I see are red x's
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Yeah, I know...that's screwed up...for some reason, sometimes it posts my old sig that doesn't exist anymore.
 
 
Make sure you ground your solenoids really good too.