Circuit Operation

For the stoplight switch, two switches, a stoplight switch for the stoplight illumination and a brake switch exclusively for the cruise control system, are incorporated to improve the reliability.
As for the stoplight switch, when the brake pedal is depressed/released, the stoplight switch "ON/OFF" signal is transmitted from the ETACS-ECU to the ECM via CAN bus line.
As for the brake switch, the ECM connector B-109 terminal number 108 monitor the state of the brake switch. The brake switch turn "ON/OFF" when the brake pedal is depressed/released, and the input signal to the ECM connector B-109 terminal number 108 changes. According to this change, the ECM judges the state of the brake switch.