1992 320i keyless entry

i am currently working on a german spec 1992 320i, ther is no unlock or lock switch, it has central locking the only way the power locks work is if you use the key in the drivers door, how would i go about setting up the keyless entry, i need to know how i would set up the relay any help would be good

You most likely will need to add an actuator and 2 relays to turn the mechanical unlocking action into an electrical one. Use this diagram as a guide http://www.commandoalarms.com/doorlockactuators.pdfSteve G

Is this an E36 BMW ? Do the doors lock if you press the button down on the top of the drivers door? If the answer is yes to both these then you need to wire for +12v pulse and tie into the wires at the vehicles control unit. This can be found in one of 2 places. Either behind the drives lower dash (black box with white plug) or behind the glovebox (black box with yellow plug)

if its an E30 then its neg pulse if its an E36 then its pos pulse