2002 ford taurus pats 3 bypass

I have a standard PATS #3 bypass unit for an 02 Taurus. There are three wires; red for positive, black for remote start negative, and blue for??

Is it a keysense? Thanks.

Yeah, but is not needed on a taurus....in fact, i've never used that wire on any Ford remote starts. Basically what the wire does, is shut the bypass off if there is a key in the ignition........Say you have a key in the ignition, and then you try to remote start the vehicle.....the pats system will get confused...it will see a signal from the key in the ignition, and a signal from the key in the box....this will cause the vehicle to not start. If you do use the keysense wire, it will send a signal to the bypass to tell it there is a key in the igniton, and the vehicle will still remote start correctly.

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Mikvot, Im an ametuer installer but is the key sense only used for the bypass units? If the car doesnt require a bypass is it ever used?

I don't think so. I've installed remote units before (without bypasses) and haven't used a keysense wire. It only makes sense if there were a bypass.