Toyota Tundra Owners Manual: Driving assist systems

To keep driving safety and performance, the following systems operate automatically in response to various driving situations.

Be aware, however, that these systems are supplementary and should not be relied upon too heavily when operating the vehicle.

ABS (Anti-lock Brake System)

Helps to prevent wheel lock when the brakes are applied suddenly, or if the brakes are applied while driving on a slippery road surface

Brake assist

Generates an increased level of braking force after the brake pedal is depressed when the system detects a panic stop situation

VSC (Vehicle Stability Control)

Helps the driver to control skidding when swerving suddenly or turning on slippery road surfaces

Trailer Sway Control

Helps the driver to control trailer sway by selectively applying brake pressure for individual wheels and reducing driving torque when trailer sway is detected

TRAC (Traction Control) for 2WD models and 2WD mode on 4WD models

Helps to maintain drive power and prevent the drive wheels from spinning when starting the vehicle or accelerating on slippery roads

Hill-start assist control

Helps to reduce the backward movement of the vehicle when starting on an uphill

When the TRAC/VSC/Trailer Sway Control systems are operating

The slip indicator light will flash while the TRAC/VSC/Trailer Sway Control systems are operating.

Using the driving support systems

Disabling the TRAC systems

If the vehicle gets stuck in mud, dirt or snow, the TRAC system may reduce power from the engine to the wheels. Pressing to turn the system off may make it easier for you to rock the vehicle in order to free it.

Using the driving support systems

■ Turning off TRAC system

2WD models and 2WD mode on 4WD models

To turn the TRAC system off, press .

The "AUTO LSD" indicator light will come on.

Press again to turn the system back on.

4H mode on 4WD models

To turn the TRAC system off, press .

The "TRAC OFF" indicator light will come on.

Press again to turn the system back on.

Using the driving support systems

4L mode on 4WD models

To turn the TRAC system off, press and hold for more than 3 seconds while the vehicle is stopped.

The VSC off and "TRAC OFF" indicator light will come on.

Press again to turn the system back on.

Using the driving support systems

■Turning off TRAC, VSC and Trailer Sway Control systems

2WD models and 2WD mode on 4WD models

To turn the TRAC, VSC and Trailer Sway Control systems off, stop the vehicle completely, and then press and hold for more than 3 seconds while the AUTO LSD system is activated.

4H mode on 4WD models

To turn the TRAC, VSC and Trailer Sway Control systems off, press and hold for more than 3 seconds while the vehicle is stopped.

The VSC off and "TRAC OFF" indicator light will come on.

Press again to turn the system back on.

■When the VSC or TRAC system is turned off by pressing the VSC off switch On vehicles with pre-collision system, pre-collision brake assist and pre-collision braking will also be disabled. The PCS warning light will come on and the message will be shown on the multi-information display.

■When the "TRAC OFF" indicator light comes on even if VSC off switch has not been pressed.

TRAC cannot be operated. Contact your Toyota dealer.

■Operating conditions of hill-start assist control When the following four conditions are met, the hill-start assist control will operate:

  • The shift lever is in a position other than P or N (when starting off forward/ backward on an upward incline)
  • The vehicle is stopped
  • The accelerator pedal is not depressed
  • The parking brake is not engaged

■Automatic system cancelation of hill-start assist control The hill-start assist control will turn off in any of the following situations: The shift lever is shifted to P or N

  • The accelerator pedal is depressed
  • The parking brake is engaged
  • 2 seconds at maximum elapsed after the brake pedal is released

■Sounds and vibrations caused by the ABS, brake assist, VSC, TRAC, Trailer Sway Control and hill-start assist control systems

  • A sound may be heard from the engine compartment when the brake pedal is depressed repeatedly, 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.
  • 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 also 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.

■Automatic reactivation of TRAC, Trailer Sway Control and VSC systems After turning the TRAC, Trailer Sway Control and VSC systems off, the systems will be automatically re-enabled in the following situations:

  • When the engine switch is turned off
  • If only the TRAC system is turned off, the TRAC will turn on when vehicle speed increases

If both the TRAC and VSC systems are turned off, automatic re-enabling will not occur when vehicle speed increases.

■If the brake system overheats 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.)

■Shifting to "4L" VSC and Trailer Sway Control are automatically turned off.

WARNING

■The ABS does not operate effectively when

  • The limits of tire gripping performance have been exceeded (such as excessively worn tires on a snow covered road).
  • The vehicle hydroplanes while driving at high speed on wet or slick roads.

Stopping distance when the ABS is operating may exceed that of normal conditions The ABS is not designed to shorten the vehicle's stopping distance. Always maintain a safe distance from the vehicle in front of you, especially in the following situations:

  • When driving on dirt, gravel or snow-covered roads
  • When driving with tire chains
  • When driving over bumps in the road
  • When driving over roads with potholes or uneven surfaces

■TRAC/VSC may not operate effectively when Directional control and power may not be achievable while driving on slippery road surfaces, even if the TRAC/VSC system is operating.

Drive the vehicle carefully in conditions where stability and power may be lost.

■Hill-start assist control does not operate effectively when

  • Do not overly rely on hill-start assist control. Hill-start assist control may not operate effectively on steep inclines and roads covered with ice.
  • Unlike the parking brake, hill-start assist control is not intended to hold the vehicle stationary for an extended period of time. Do not attempt to use hill-start assist control to hold the vehicle on an incline, as doing so may lead to an accident.

 

WARNING

■When the TRAC/VSC/Trailer Sway Control are activated The slip indicator light flashes. Always drive carefully. Reckless driving may cause an accident. Exercise particular care when the indicator light flashes.

■When the TRAC/VSC/Trailer Sway Control systems are turned off Be especially careful and drive at a speed appropriate to the road conditions.

As these are the systems to help ensure vehicle stability and driving force, do not turn the TRAC/VSC/Trailer Sway Control systems off unless necessary.

Trailer Sway Control is part of the VSC system and will not operate if VSC is turned off or experiences a malfunction.

■Replacing tires Make sure that all tires are of the specified size, brand, tread pattern and total load capacity. In addition, make sure that the tires are inflated to the recommended tire inflation pressure level.

The ABS, TRAC, VSC and Trailer Sway Control systems will not function correctly if different tires are installed on the vehicle.

Contact your Toyota dealer for further information when replacing tires or wheels.

■Handling of tires and the suspension Using tires with any kind of problem or modifying the suspension will affect the driving assist systems, and may cause a system to malfunction.

■Trailer Sway Control precaution The Trailer Sway Control system is not able to reduce trailer sway in all situations.

Depending on many factors such as the conditions of the vehicle, trailer, road surface, and driving environment, the Trailer Sway Control system may not be effective. Refer to your trailer owner's manual for information on how to tow your trailer properly.

■If trailer sway occurs Observe the following precautions.

Failure to do so may cause death or serious injury.

  • Firmly grip the steering wheel. Steer straight ahead.

    Do not try to control trailer swaying by turning the steering wheel.

  • Begin releasing the accelerator pedal immediately but very gradually to reduce speed.

    Do not increase speed. Do not apply vehicle brakes.

If you make no extreme correction with the steering or brakes, your vehicle and trailer should stabilize.

    AUTO LSD system

    Trailer brake controller

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