I have successfully installed a simple keyless entry system into my 92 G60. The same or similar process should be used for 89-95 C's. Below is a simple step-by-step procedure. I recommend that you not attempt this procedure if you haven't had much experience with various forms of automobile wiring.

1. You must purchase a keyless entry system. I bought an Ungo off of eBay brand new for $30. I have seen the same unit for $129.99, so shop around. Any universal keyless entry unit will work. Different units can perform different features (i.e. you can add sirens, shock sensors, remote start, starter kill, other various accessories, etc.). I am using mine as keyless entry only, not as an alarm.

2. Tools: phillips screwdriver, flat-head screwdriver, light tester, wire cutters, crimping tool, crimp connectors, extra various colored electrical wires, and patience.

3. Choose the best place for the unit in the dash somewhere. I placed mine to the left of the instrument cluster because I was tired of other install jobs where the unit falls out every time I wanted to replace a fuse, or if I was driving and the unit would fall and get stuck under the pedals...but you can put it wherever you want. Leave the unit unplugged from the main multi-pin connector that it comes with.

3. Follow the instructions carefully. The units have 3 main wires just like stereos. 12v constant (battery), ignition, and ground. Connect these 3 to the multi-pin connector. Let the rest of the wires on the connector hang on the floorboard of the vehicle.

4. Choose a place for the LED, and drill a small hole for it to show conspicuously (so that it will at least look like an alarm even if you don't hook up a siren). Place LED through the hole and plug into unit. (It is best to leave the unit in or near the place where it will be mounted).

5. Choose an inconspicuous place for an override switch (i.e. under the dash where you can reach it easily, but not in plain sight). Drill a hole if necessary, mount the switch, and plug it in(the unit will have this switch when you buy the system...it is very important to install this...it comes in handy if you lose your remote).

6. Now comes some of the tricky parts. In order for your lights to flash when you push activate the remotes, you need to tap into a wire that is connected to your lights. Use the light tester to find one. If you have to, have someone help you find one. Usually if you do the time consuming easy parts, a knowledgeable friend will help you do the hard parts!

7. The next step requires removing the driver's side door panel. Follow the steps listed in the Tech Tips. Carefully peel the plastic on the right side so you can access the wires. Run the wires for the locks through the door grommet and grab a hold of and pull them through where you just pulled the plastic off of the door. Now connect them properly to the proper wires. (Since all keyless entry units are different, you must have somebody help you with this. The unit will come with detailed instructions, however. Most connections will be between the relays and the lock. You will probably have to intercept 2 of the wires. Feel free to e-mail me and I will try to help you if I can).

8. Replace the door panel, plug the multi-pin connector into the unit, mount the unit using zip-ties or screws (depending on where you want it mounted), close your door, and push your remote button.

There are SO many different things you can do with these babies. There should be extra wires. One can be hooked up to your door swith so when you disarm your locks the dome light will come on for a certain amount of time. There should be jumpers you can readjust so that when you arm your unit, the windows roll up just as when you hold your key in the lock position (it gives it a 40 second pulse instead of a 1 second pulse). As mentioned before, you can install a siren, or shock sensor to make it a full alarm. Those mods should be easy for you if you can install the unit.