Electronic signaling device

In a motor vehicle including an ignition switch, a door for entry into and exit from the vehicle, and key-operated locking means operatively associated with the ignition switch, improved signaling apparatus comprising, in combination, a first electrical switch movable between open and closed positions upon insertion of the key into and removal thereof from the locking means, a power source, a resistor, a diode and a transistor having a base, an emitter and a collector, signaling means, a second electrical switch movable between open and closed positions, a first electrical circuit connecting said power source through said resistor and said first switch to ground, a second electrical circuit connecting said power source through the collector and the emitter of said transistor, said signal means and said second switch to ground, and a third electrical circuit connecting said first electrical circuit through said diode to the base of said transistor;

• said resistor, said diode and said transistor being operably connected in said circuit so that (1) when said first electrical switch is in its closed position, said transistor prevents said signaling means from being energized;
• while (2) when said first electrical switch is in its open position, said transistor is operable to enable the energizing of said signaling means, whereby, when said first electrical switch is in its open position, said signal means is energized when said second switch is closed, and is not energized when said second switch is open.