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I installed Keyless remote in my 83 300D 3 years ago. I am not sure about how 85 works but I believe it should be very similar.
You need to add an actuator to control the vacuum switch inside the driver's door. The system I bought off eBay is a cheapo and simple. It has all the relays inside the control box, no external relay is needed. This is what I suspect you need to do:
1) Hook up the actuator to the vacuum switch which move the vacuum switch in lock or unlock position.
2) Set the control box to pneumatic mode to give it more actuation time.
3) Find a configuration in the instruction manual which gives you 2 output wires, say A and B to wire them to the actuator ( 2 wires model, some model has more ).
4) When in lock, it gives A = 12V, B = 0V locking pulse. Actuator goes up.
5) When in unlock, it gives A = 0V and B = 12V unlocking pulse. Actuator goes down.
6) You need to wire a feedback to the control unit ( Door Open+ or Door Open- ) to indicate door open. The door switch to actuate the courtesy light would do.
That is all there to it. You can hook everything on the table to make sure it functions as above before installing it.
Good luck.
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