Abstract: A method of controlling a loader operation using a control system is provided. The system is intended for use on a conventional skid steer loader of the type having either a cab with an integral door for operator access to the cab or a door kit installed thereon. The system includes a door position sensing means for sensing a position of the door of the cab. A disabling means of the system is provided for disabling a lift mechanism of the loader in response to detection that door of the cab is not fully closed by the door position sensing means. The disabling means may comprise a mechanism for coupling the door position sensing means to an existing disabling system of the lift of the vehicle.