2010 Toyota Tacoma Regular Cab Owners Manual - Page 212

2-4. Using other driving systems When the VSC/TRAC/hill-start assist control systems are operating If the vehicle is in danger of slipping, the rear wheels (2WD models) or four wheels (4WD models) spin, the vehicle starts to roll backwards when starting on an incline, this indicator flashes to indicate that the VSC/ TRAC/hill-start assist control systems have been engaged. A buzzer (intermittent) sounds to indicate that VSC is operating. The stop lights and high mounted stoplight turn on when the hillstart assist control system is operating. To disable TRAC and/or VSC If the vehicle gets stuck in fresh snow or mud, TRAC and VSC may reduce power from the engine to the wheels. You may need to turn the system off to enable you to rock the vehicle in order to free it.