Since your relays are working with the remote, your problem is getting the right wires.

You need either a test lead or a some kind of wire that has a needle-type of probe on one end. Ground the other end somewhere in the trunk. Using the probe, press it into the wires one at a time. You are looking for one wire that locks the car when you ground it with the probe, and one that unlocks. Those are then the 2 wires you hook into the relays.

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Bill Streep
San Antonio
'57 190SL (toy)
'08 S5500 (mine)
'09 CLK550 (wife's)
'06 SLK350 (daughter's)
'11 GLK350 (daughter's)
'03 CLK310 (spare)