US Patent 8376416 Latch system for a door of an automobile

A system is provided for latching a door of an automobile. The system includes, but is not limited to, a first power source, second power source, a latch for the door coupled to the first power source and the second power source, and an electronic control unit configured to control an operation of the latch. The electronic control unit is further configured to determine a status of the first power source, evaluate the status of the first power source, and control the operation of the latch with the second power source if the evaluation of the status indicates the first power source is unavailable.