I'm currently replacing the doors on my car due to an accident. I was wondering what the electronic unit is below the door latch, thought it might be for the remote entry. If it is the remote entry do I need to swap in my old units for it to function properly?
Is it a black box that's mounted on the bottom left underneath the door panel that you're talking about? If so, I believe it is the unit that allows the one-touch down window to work.
You would have to search for it. It's been a LONG time since I've looked it up. I know people do it when they have the remotes programmed to roll up their windows. They reverse the wiring so it's one touch to make them go up. One touch on the remote sends a signal and rolls your windows up. Pretty cool.
I would assume you hook up the second box the same way as the first one.