Vehicle anti-theft system

1. A vehicle anti-theft system comprising:

at least one sensor to indicate a vehicle driver's presence;

an electronic control unit configured to impair the vehicle drivability when an indication of driver absence is received from the at least one sensor; and

an input device connected to the electronic control unit to receive an authorization, wherein the electronic control unit is configured to enable the vehicle drivability when an indication of driver presence is received from the at least one sensor and the authorization is received from the input device;

wherein the electronic control unit interrupts the connection between a brake pedal and a park shift interlock of the vehicle when absence of a driver is indicated.

2. A vehicle anti-theft system comprising:

at least one sensor to indicate a vehicle driver's presence;

an electronic control unit configured to impair the vehicle drivability when an indication of driver absence is received from the at least one sensor; and

an input device connected to the electronic control unit to receive an authorization, wherein the electronic control unit is configured to enable the vehicle drivability when an indication of driver presence is received from the at least one sensor and the authorization is received from the input device;

wherein the electronic control unit maintains the connection between a brake pedal and a park shift interlock of the vehicle to enable the vehicle drivability when the presence of the driver is indicated and an authorization is received.

3. A vehicle anti-theft system comprising:

at least one sensor to indicate a vehicle driver's presence;

an electronic control unit configured to impair the vehicle drivability when an indication of driver absence is received from the at least one sensor;

an input device connected to the electronic control unit to receive an authorization, wherein the electronic control unit is configured to enable the vehicle drivability when an indication of driver presence is received from the at least one sensor and the authorization is received from the input device; and

a manual override system to control the vehicle drivability;

wherein the manual override system is configured to disable the electronic control unit and control at least one service brake of the vehicle.

4. A vehicle anti-theft system comprising:

at least one sensor to indicate a vehicle drivers presence;

an electronic control unit configured to impair the vehicle drivability when an indication of driver absence is received from the at least one sensor;

an input device connected to the electronic control unit to receive an authorization, wherein the electronic control unit is configured to enable the vehicle drivability when an indication of driver presence is received from the at least one sensor and the authorization is received from the input device; and

a manual override system to control the vehicle drivability;

wherein the manual override system is configured to disable the electronic control unit and control connection between a brake pedal and a park shift interlock of the vehicle.

5. A vehicle anti-theft system comprising:

at least one sensor to indicate a vehicle driver's presence;

an electronic control unit configured to impair the vehicle drivability when an indication of driver absence is received from the at least one sensor;

an input device connected to the electronic control unit to receive an authorization, wherein the electronic control unit is configured to enable the vehicle drivability when an indication of driver presence is received from the at least one sensor and the authorization is received from the input device; and

a manual override system to control the vehicle drivability;

wherein the manual override system includes a keyed lock that must be unlocked before operation.

6. A vehicle anti-theft method comprising:

detecting a driver's status;

interrupting a connection between a brake pedal and a park shift interlock of the vehicle via an electronic control unit to impair the vehicle drivability, when the driver absence is detected; and

establishing the connection between the brake pedal and the park shift interlock of the vehicle to enable the vehicle drivability via the electronic control unit when the driver presence is detected and an authorization is received.

7. The method of claim 6 , wherein the authorization is received from an input device connected to the electronic control unit.

8. The method of claim 6 , wherein the driver presence is detected when the driver's seat is occupied and the driver's door is closed.

9. The method of claim 6 , wherein the driver absence is detected when the driver's seat is empty and the driver's door is open.

10. The method of claim 6 , further comprising:

manually overriding operation of the electronic control unit in an emergency situation.

11. A vehicle anti-theft method comprising:

detecting a driver's status;

applying brake to at least one brake of the vehicle via an electronic control unit to impair the vehicle drivability when the driver absence is detected; and

releasing brake to the at least one brake of the vehicle to enable the vehicle drivability when the driver presence is detected and an authorization is received;

wherein the manual override system comprises a keyed lock that must be unlocked before operation.

12. The method of claim 11 , wherein the authorization is received from an input device connected to the electronic control unit.

13. The method of claim 11 , wherein the driver presence is detected when the driver's seat is occupied and the driver's door is closed.

14. The method of claim 11 , wherein the driver absence is detected when the driver's seat is empty and the driver's door is open.

15. The method of claim 11 , further comprising manually overriding the operation of the electronic control unit in an emergency situation.

16. A vehicle anti-theft system comprising:

at least one sensor to indicate a vehicle driver's presence;

an electronic control unit configured to impair the vehicle drivability when an indication of driver absence is received from the at least one sensor; and

an input device connected to the electronic control unit to receive an authorization, wherein the electronic control unit is configured to enable the vehicle drivability when an indication of driver presence is received from the at least one sensor and the authorization is received from the input device;

wherein the input device is a keypad.

17. The vehicle anti-theft system of claim 16 , wherein the at least one sensor comprises a driver's door position sensor and the driver's seat sensor.

18. The vehicle anti-theft system of claim 16 , wherein presence of a driver is indicated when the driver's seat is occupied and the driver's door is closed.

19. The vehicle anti-theft system of claim 16 , wherein absence of a driver is indicated when the driver's seat is empty and the driver's door is open.

20. The vehicle anti-theft system of claim 16 , wherein the electronic control unit applies brake to at least one service brake of the vehicle to impair the vehicle drivability when absence of a driver is indicated.

21. The vehicle anti-theft system of claim 16 , wherein the electronic control unit release brake to at least one service brake of the vehicle to enable the vehicle drivability when the presence of a driver is indicated and an authorization is received.

22. The vehicle anti-theft system of claim 16 , further comprising a manual override system to control the vehicle drivability.

23. The vehicle anti-theft system of claim 16 , wherein the driver's seat is indicated as empty when the driver seat is unoccupied for a predetermined period of time.

24. The vehicle anti-theft system of claim 16 , wherein the input device is configured to indicate one or more of driver's seat occupancy, door position and parking brake status by one or more of a light pattern, a light color, a sound pattern and a sound pitch.