An electronic control apparatus (200; 300) comprising: a first electronic control apparatus (220; 310) including a first signal processor configured to process a signal of a wheel speed sensor ; and a second electronic control apparatus (230; 320) including: a second signal processor (233; 321) configured to process the signal of the wheel speed sensor ; a first switching device (231a; 312) electrically provided between the wheel speed sensor and the first signal processor (221; 311), configured to allow or block the signal of the wheel speed sensor to be transmitted to the first signal processor (221; 311), and a second switching device (231b; 322) electrically provided between the wheel speed sensor and the second signal processor (233; 321), configured to allow or block the signal of the wheel speed sensor to be transmitted to the second signal processor (233; 321), characterised in that the first electronic control apparatus (220; 310) further comprises a first controller (222; 313) configured to transmit a periodic normal operation signal to the second electronic control apparatus (230; 320) and the second electronic control apparatus (230; 320) further comprises a second controller (232; 323) configured to control operations of the first switching device (231a; 312) and the second switching device (231b; 322) in response to receipt of the normal operation signal. a first electronic control apparatus (220; 310) including a first signal processor configured to process a signal of a wheel speed sensor ; and a second electronic control apparatus (230; 320) including: a second signal processor (233; 321) configured to process the signal of the wheel speed sensor ; a first switching device (231a; 312) electrically provided between the wheel speed sensor and the first signal processor (221; 311), configured to allow or block the signal of the wheel speed sensor to be transmitted to the first signal processor (221; 311), and a second switching device (231b; 322) electrically provided between the wheel speed sensor and the second signal processor (233; 321), configured to allow or block the signal of the wheel speed sensor to be transmitted to the second signal processor (233; 321), characterised in that a second signal processor (233; 321) configured to process the signal of the wheel speed sensor ; a first switching device (231a; 312) electrically provided between the wheel speed sensor and the first signal processor (221; 311), configured to allow or block the signal of the wheel speed sensor to be transmitted to the first signal processor (221; 311), and a second switching device (231b; 322) electrically provided between the wheel speed sensor and the second signal processor (233; 321), configured to allow or block the signal of the wheel speed sensor to be transmitted to the second signal processor (233; 321), the first electronic control apparatus (220; 310) further comprises a first controller (222; 313) configured to transmit a periodic normal operation signal to the second electronic control apparatus (230; 320) and the second electronic control apparatus (230; 320) further comprises a second controller (232; 323) configured to control operations of the first switching device (231a; 312) and the second switching device (231b; 322) in response to receipt of the normal operation signal. <EOS>