2012 Toyota Tacoma Owners Manual - Page 524

2-4. Using other driving systems When the VSC/Trailer Sway Control/TRAC/hill-start assist control systems are operating If the vehicle is in danger of slipping or rolling backward when starting on an incline, or if any of the drive wheels spins, the slip indicator light flashes to indicate that the VSC/Trailer Sway Control/TRAC/hill-start assist control systems are operating. The stop lights and high mounted stoplight turn on when the hill-start assist control system or Trailer Sway Control is operating. 2 When driving 201