2011 Toyota Sequoia Owners Manual - Page 272

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 slip indicator will come on. When driving 2 The system is in all off mode. Push the switch again to turn the system back on. n Automatic A-TRAC reactivation (A-TRAC OFF mode) With A-TRAC OFF mode, slip indicator turn on. The A-TRAC system will turn on when the vehicle speed increases. n Sounds and vibrations caused by the ABS, TRAC, A-TRAC, VSC and brake assist system l A sound may be heard from the engine compartment when the engine is started and 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 the ABS is activated. The brake pedal may move down slightly after the ABS is activated. n If the brake system overheats TRAC or A-TRAC will cease operation, and the slip indicator will change from flashing to being on continuously to alert the driver. Stop the vehicle in a safe place. (There is no problem with continuing normal driving.) 239