Toyota TUNDRA 2009 Manual page 231

To disable VSC and A-TRAC (4WD mode on 4WD models)
If the vehicle gets stuck in fresh snow or mud, VSC may reduce
power from the engine to the wheels. You may need to turn VSC and
A-TRAC off to enable you to rock the vehicle in order to free it.
n Automatic reactivation of TRAC, A-TRAC and VSC
Turning the engine switch off after turning off the TRAC, A-TRAC and VSC
systems will automatically re-enable them.
Sounds and vibrations caused by the ABS, TRAC, A-TRAC, VSC and
n
brake assist system
A sound may be heard from the engine compartment when the engine is
l
started and just after the vehicle begins to move. This sound does not
indicate that a malfunction has occurred in any of these systems.
Any of the following conditions may occur when the above systems are
l
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.
If the brake system overheats
n
TRAC or A-TRAC will cease operation and a buzzer will sound to alert the
driver. Stop the vehicle in a safe place. (There is no problem with continuing
normal driving.)
2-4. Using other driving systems
Stop the vehicle completely, and
press the VSC OFF switch for
more than 3 seconds.
The slip and VSC OFF indicators
will come on.
The system is all off mode.
Push the switch again to turn the
system back on.
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