A brake system control unit for a vehicle having a hydraulic vehicle brake and electromechanical brake device comprises a microcontroller, a system ASIC and a brake motor ASIC, wherein the microcontroller is connected to the system ASIC and the brake motor ASIC via communication interfaces. In the brake motor ASIC, an interrogation signal sequence for interrogating the switched state of an actuation switch of the electromechanical brake device is generated.