agape

I have recently become the owner/driver of a '93 Villager.
It is in pretty good shape, and I like it well enough - except for just
2 things - I am used to a smaller, less thirsty vehicle....but that is
just a fact - my question is about the 2nd thing - the central locks
work, but the driver's door lock cylinder is jammed, maybe with a
broken key fragment inside, so, my question:

Would someone tell me where the relay lives that controls the
locks when the lock/unlock button is pressed ?
I have a nifty little remote unit I would like to wire in so I don't
have to take apart the driver's door OR always unlock the
passenger's door to get in each time.....

Thanks !

mark