Circuit Description
WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Brake switch may also be referred to as stop light switch.
In this system, the signal of the stop light switch is used to judge whether the acceleration system is abnormal or not. The stop light switch has a duplex system (signals STP and ST1-) to memorize the abnormality when the signals of depressing and releasing the brake pedal are detected simultaneously. For normal condition, see BRAKE SWITCH NORMAL CONDITION table. Possible causes are:
- Faulty stop light switch signal circuit.
- Faulty stop light switch.
- Faulty ECM.
BRAKE SWITCH NORMAL CONDITION
| Signal | Brake Pedal Released | In Transition | Brake Pedal Depressed |
|---|---|---|---|
| STP | OFF | ON | ON |
| ST1- | ON | ON | OFF |