,This is a duplex system that transmits two signals: STP and ST1-.The ECM Uses these signals to monitor the brake, whether or not the brake system is working properly. There ‘s only one signal to be detected at one time, this is either signal which is indicate the brake pedal is being depressed or the signal which is indicate that the brake pedal is being released. If the both signals are detected simultaneously, the ECM intrepets this as a malfunction in the light switch and sets the DTC. The Wiring Diagram below shows the Toyota FJ Cruiser Stop Light Switch Wiring Diagram.
