Abstract: A display system for use in a vehicle, the display system including first and second controllers in communication with each other and a display mounted in the vehicle. The display is communicatively coupled to the second controller and has a display area. The first controller executes the steps of incorporating a pattern in a set of data thereby producing a dataset; and communicating the dataset to the second controller. The second controller executes the steps of receiving the dataset from the first controller; rendering a graphic from the dataset; and making the rendered graphic available to the display for display in the display area. The first controller then additionally executes the steps of reading the rendered graphic; and evaluating the rendered graphic to see if the pattern has been correctly processed by the second controller.

Abstract: A vehicle security system that includes a knock detection means such as a microphone configured to detect knocking on the vehicle such as knocking on a window of the vehicle. The system includes a controller configured to receive a signal from the knock detection means and unlock a door of the vehicle if the signal corresponds to a predetermined pattern.