2013 Toyota Sequoia Owners Manual - Page 234

2-4. Using other driving systems To disable A-TRAC (4L mode on 4WD models) If the vehicle gets stuck in fresh snow or mud, A-TRAC 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. Stop the vehicle completely, and press the VSC OFF switch for more than 3 seconds. The TRAC OFF indicator will come on. The system is in all off mode. Push the switch again to turn the system back on.