Auxiliary control system and method to a motor vehicle's built-in anti-theft system

An auxiliary control system to a motor vehicle having a built-in anti-theft system, said built-in anti-theft system having at least a wireless receiver, a Main Body ECU connected to and controlled by said wireless receiver via a plurality of first signal wires, and a plurality anti-theft means controlled by said Main Body ECU, said auxiliary control system comprising:

• a first interaction device;
• and
• a second interaction device installed in said motor vehicle, said first and second interaction devices capable of mutually detecting each other, said second interaction device capable of producing control signals in a manner identical to those from said wireless receiver to said Main Body ECU, said second interaction device connected to said Main Body ECU in parallel with said wireless receiver by tapping a plurality of second signal wires to said first signal wires;
• wherein, when said second interaction device detects that said first interaction device is moved into or out of an effective sensing range from said motor vehicle, said second interaction device sends said control signals to said Main Body ECU to deactivate or activate said anti-theft means, respectively.