PeachParts Mercedes-Benz Forum - View Single Post - C280 Keyless entry from "the keyless entry guy"

bstreep · #6 05-11-2003, 08:41 PM

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.