Abstract: A light system including: light branches extending in parallel to one another with each of the light branches have lights that provide light to a region around a vehicle, the light branches include: a primary light branch include: a bias circuit and a switch; and secondary light branches that are controlled by the primary light branch; wherein electricity is provided to the light branches and when all of the lights on the light branches are operating properly the electricity maintains the switch in a closed position; and when any of the lights fail or are not operating properly, electricity is prevented from extending through the light branch, by the lights that have failed, and the electricity continues to extend through the light branches that are operating properly so that the electricity that extends to the switch is not sufficient to maintain the switch in the closed position.

Abstract: A light system including: light branches extending in parallel to one another with each of the light branches have lights that provide light to a region around a vehicle, the light branches include: a primary light branch include: a bias circuit and a switch; and secondary light branches that are controlled by the primary light branch; wherein electricity is provided to the light branches and when all of the lights on the light branches are operating properly the electricity maintains the switch in a closed position; and when any of the lights fail or are not operating properly, electricity is prevented from extending through the light branch, by the lights that have failed, and the electricity continues to extend through the light branches that are operating properly so that the electricity that extends to the switch is not sufficient to maintain the switch in the closed position.

Abstract: A serial communication system for a vehicle including an interface circuitry that generates a triggering signal, and a controller circuitry with an input block, an output block, a controller connected to the input block and the output block, the controller being configured to function in a normal mode or in a diagnostic mode, wherein in the normal mode the controller receives a sensing signal and provides an actuating signal based on the sensing signal, and in the diagnostic mode the input block transmits an input communication signal from the interface circuitry and the output block transmits an output communication signal from the controller to the interface circuitry, and a Diagnostic mode detector connected to the input block and configured to receive the triggering signal detect the triggering signal, and switch the controller from the normal mode to the diagnostic mode when the triggering signal is detected.

Abstract: A serial communication system for a vehicle including an interface circuitry that generates a triggering signal, and a controller circuitry with an input block, an output block, a controller connected to the input block and the output block, the controller being configured to function in a normal mode or in a diagnostic mode, wherein in the normal mode the controller receives a sensing signal and provides an actuating signal based on the sensing signal, and in the diagnostic mode the input block transmits an input communication signal from the interface circuitry and the output block transmits an output communication signal from the controller to the interface circuitry, and a Diagnostic mode detector connected to the input block and configured to receive the triggering signal detect the triggering signal, and switch the controller from the normal mode to the diagnostic mode when the triggering signal is detected.

Abstract: An LED lighting circuit for detecting individual LED failure, including a lighting unit including a plurality of LEDs connected in series, and a plurality of LED sensors each associated with a respective one of the LEDs. Also included is a lighting unit status signal generator coupled to the plurality of LED sensors configured to provide a status signal indicating a fault when any individual LED is short circuited.