2009 Toyota Sienna Owners Manual - Page 244

2-4. Using other driving systems To disable TRAC (2WD models only) If the vehicle gets stuck in fresh snow or mud, 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. n Turning off TRAC Push the button to turn off TRAC. The "TRAC OFF" indicator light should come on. Push the button again to turn the system back on. n Automatic reactivation of TRAC (2WD models only) Turning the engine switch off after turning off the TRAC system will automatically re-enable it. n Sounds and vibrations caused by ABS, brake assist, VSC and TRAC l A sound may be heard from the engine compartment when the engine is started or just after the vehicle begins to move. This sound does not indicate that a malfunction has occurred in any of these systems. l Any of the following conditions may occur when the above systems are operating. None of these indicates that a malfunction has occurred Vibrations may be felt through the vehicle body and steering. A motor sound may be heard after the vehicle comes to a stop. The brake pedal may pulsate slightly after ABS is activated. The brake pedal may move down slightly after ABS is activated. 216