compustar 2wss-as

the 556U is to send a key sense signal to ur cars ignition.. without this signal the car will not know a key is in the area.   u put the spare key/chip in the 556, and ground/power the 556. then u send the proper signal wire from the compustar unit( status wire i think) to the 556. you wrap the antenna wire of thr 556 around the key column. when u try to remote start, the compustar will activate the 556 which in turn send the key code to the ignition to let the car know a key chip is present. after activating this the compustar starts. when u get int he car and insert a real key the compustar disable the 556 immediately so the car doesnt read two keys. you dont NEED the keysense wire from the 556, it depends on the type of keysense system u have. some cars, instead of just wrapping the antenna wire.. need u to splice into the key sense wire on the cars keysensor unit.