Hi, I recently bought a '94 C 280 and would like to add keyless entry on it. From looking around at various websites it seems that it is possible to wire this up directly to the vaccume pump. Ican get to the vaccume pump but i dont know which wires are used to unlock and lock the doors. Also i feel as if there should be something more to it than simply splicing 2 wires.Any diagrams would be really helpful.

 

I figured out which wires are for locking and unlocking. I also tested unlocking and locking the car with my remote and it does work. Will doing this harm the vacuum at all?
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My 85 380SE has a system I put on it 5 yrs ago, no ill effects to the vacuum pump, it sees the remote command as if the key was turned. I did have to use relays because the controller would not carry the current required. Also you might consider a system that was the ability to flash the headlights when the locks activate, as mine is so old it won't and I have to listen for the vacuum acutators to tell me the doors locked

Tom