Abstract:
A vehicle headlamp control circuit used in conjunction with the conventional vehicle headlamp control switch and comprising a relay in parallel with the headlamp switch, an RC charge storage and timed discharge network and a transistor switch controlled by the headlamp and vehicle ignition switches to cause the RC network to charge through the ignition switch and to discharge and actuate the relay to delay headlamp deenergization if and only if the headlamp switch is opened after the ignition switch is opened.
Abstract:
A motor vehicle door lock lighting system wherein actuation of the door opening mechanism momentarily activates the passenger compartment courtesy lights and supplemental lights on the doors for illuminating the door lock key slots, thereby permitting visual inspection of the inside of the car without opening the door, illuminating the key slot for easy key insertion, and preventing battery run down due to jamming of the door opening mechanism.
Abstract:
A vehicle lamp control system which, with the ignition switch closed, automatically energizes the lamps after a first time delay in darkness and deenergizes the lamps after a second time delay in light and, in darkness, automatically deenergizes the lamps after a third time delay when the ignition switch is opened and energizes the lamps after a fourth time delay when the ignition switch is closed. The time delay circuit consists of a capacitor and a plural number of resistors. The lamp switching circuit also controls the time delay circuit by connecting a different resistor with the capacitor in an RC timing circuit to produce each time delay.