http://www.nettally.com/dale/bim.html
That link could get you started. I installed a cheap bulldog keyless entry system in my car last year. All the wires you need to access are in the harness under the rear seat.
With my system, I was able to achieve the following:
- remote ock / unlock
- horn confirmation (kind of sucks)
- parking light confirmation (lock / unlock)
- interior lights come on when trigger unlock
- double lock (security lock, whatever)
- auto window / sunroof closure (requires to hold down button)
I cannot remember the exact way I did this, but if you search this and other boards, maybe the net generally under Bulldog Keyless Entry and E34 or 535 you should be able to find the various elements you need.
I know you are using clifford, but the outputs on these are generally similar. I do remember something about some systems having positive triggers and others having negative triggers....
Research is key.
Rod