Circuit Description
WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
The signal of the stop lamp switch is used to determine whether the acceleration system is malfunctioning or not. The stop lamp switch has a duplex system (signals STP and ST1-) to memorize the malfunction when the signals of depressing and releasing the brake pedal are detected simultaneously.