1995 TA T56 won't start-security light on!!
As mentioned above it sounds like the wires in your column have a break in them somewhere. It's a common problem on older cars. These wires measure the resistance in the chip in your key and that resistance must match the stored value in your TDM/BCM within a certain %. If not the car won't start. There are a couple tests you can do by jumping the resistor wires or the relay switch.
http://shbox.com/1/pass_key.html
Wire in a resistor to match the resistance of the pellet in your key at the point marked in the diagram above.



