Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Sfi System: Brake Switch "A"/"B" Signal Cross Coupled (P05042B)
DESCRIPTION The stop light switch assembly is a duplex system that transmits two signals: STP and ST1-. These two signals are used by the ECM to monitor whether or not the brake system is working properly. If the signals, which indicate the brake pedal is being depressed and released, are detected s ...
