Automotive electrical component unit

An integrated power supply supervisory circuit (7) for an automotive electrical component unit, ECU (1), comprising at least one microcontroller (2) supplied with an electrical power provided by a power supply regulator (5) of said electrical component unit, ECU (1), wherein said power supply supervisory circuit (7) is adapted to supervise said power supply regulator (5) of said electrical component unit, ECU (1), and switches to an integrated power supply regulator (8) integrated in said supervisory circuit (7) if said supervised power supply regulator (5) has a malfunction.