I found this on another site, and they said they found it on a 3rd site and copied it, so I'm just going to copy it myself.
Maybe you could add a remote to it?
The alarm unit is located under the driver seat. It has two plugin style connectors.
The alarm only unlocks and locks the doors.
The remotes are Egg shaped and Black only the gray remotes don't work.
I found the magic program button on the side of the unit, mine was hidden by the Zip tie that was used to secure the alarm unit to the floor. I ordered a remote off E-Bay single button non OEM $17.
Here is how I programmed it no dealer required or having to do a jig.
1. Put the key in the ignition and turn it on (do not start the car)
2. Push the driver seat all the way forward.
3. Go to the back seat behind the driver seat, and locate your alarm on the floor.
4. Find the magical green button on the side of the VIP S1000 alarm module. (with the wire connectors facing away from you, the button was located on the right side of the alarm)
5. Push in the green button for 2-3 seconds and release.
6. Very important: Within 30 seconds On your remote push the Lock button. (The lights on my vehicled cycled)
7. Go back and turn the key off and remove the key.
8. Close all your doors on your car and test your remote!
It's that simple! got to love it!