Circuit for triggering warning lamps

A circuit for triggering the warning lamp of an automotive vehicle brake system having electronic anti-lock or traction slip control, of the type including an electronic controller connected to one or a plurality of supply voltages, a power driver through which the warning lamp current flows in the presence of a monitoring signal initiated by malfunction of the controller, comprising:

• a self-conductive transistor circuit with a triggering circuit connected to the supply voltages of the controller which, as long as all supply voltages are present, keeps the transistor circuit blocked and, on failure or decline of any of the supply voltages below a threshold value, causes current to flow to the warning lamp to the control terminal of the power driver to trigger or switch on the power driver, wherein the self-conductive transistor circuit includes two serially connected p-channel field effect transistors, the gate terminals of which are interconnected, connected to the outlet of the triggering circuit, and connected to ground by way of a high-ohmic resistor.