Abstract: A system and method is provided for operating incandescent lamps with a high voltage source in a motor vehicle. The system includes at least one pulse width modulation circuit having an incandescent lamp electrically connected to a high voltage source. The system also includes a generator electrically connected to the at least one pulse width modulation circuit for generating a pulse width modulation signal to modulate a voltage of the high voltage source to a voltage rating of the incandescent lamp.

Abstract: A method and circuit for actively controlling the transition resistance of a multiplex communication signal line having a known termination resistance and characterized by digital signals defined by dominant and recessive states between a voltage source and a ground potential. The digital signal is sensed at the node when it moves through a transition band defined between the dominant and recessive states. The effective terminator resistance at the node along the signal line is reduced only responsive to the digital signal level being within the transition band, whereby the transition time for the signal to travel through the transition band is reduced by reducing the effective resistance and therefore the effective RC time constant at the node.