Toyota RAV4 manuals

Toyota Sienna 2010-2018 Owners Manual: Driving assist systems

To help enhance 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

TRAC (Traction Control)

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 (if equipped)

Helps to prevent the vehicle from rolling backward when starting on an incline or slippery slope

EPS (Electric Power Steering)

Employs an electric motor to reduce the amount of effort needed to turn the steering wheel

Active Torque Control 4WD (AWD models only)

Automatically switches from front-wheel drive to AWD (All-Wheel Drive) according to driving conditions, helping to ensure reliable handling and stability. Examples of conditions where the system will switch to AWD are when cornering, going uphill, starting off or accelerating, and when the road surface is slippery due to snow or rain etc.

VDIM (Vehicle Dynamics Integrated Management) (if equipped)

Provides integrated control of the ABS, brake assist, TRAC, VSC, hill-start assist control, and EPS systems Helps to maintain vehicle stability when swerving on slippery road surfaces by controlling the brakes and engine output

PCS (Pre-Collision System) (if equipped)

When the TRAC/VSC systems are operating

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

Toyota Sienna. When the TRAC/VSC systems are operating


Disabling TRAC system

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.

To turn the TRAC system off, quickly press and release .


Toyota Sienna. Disabling TRAC system


The “Traction Control OFF”/“TRAC OFF” will be shown on the multiinformation display.

Press again to turn the system
back on.

Turning off both TRAC and VSC systems

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

The VSC OFF indicator light will come on and the “Traction Control OFF”/ “TRAC OFF” will be shown on the multi-information display.

Press again to turn the
systems back on.

When the message is displayed on the multi-information display showing that TRAC has been disabled even if
has not been pressed

TRAC and hill-start assist control (if equipped) cannot be operated. Contact your Toyota dealer.

Sounds and vibrations caused by ABS, brake assist, TRAC, VSC and hill-start assist control (if equipped) systems

When the steering wheel is operated, a motor sound (whirring sound) may be heard. This does not indicate a malfunction.

Automatic reactivation of TRAC and VSC systems

After turning the TRAC and VSC systems off, the systems will be automatically re-enabled in the following situations:

Reduced effectiveness of the EPS system

The effectiveness of the EPS system is reduced to prevent the system from overheating when there is frequent steering input over an extended period of time. The steering wheel may feel heavy as a result. Should this occur, refrain from excessive steering input or stop the vehicle and turn the engine off. The EPS system should return to normal within 10 minutes.

Operating conditions of hill-start assist control (vehicles with a hill-start assist control system)

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

Automatic system cancelation of hill-start assist control (vehicles with a hill-start assist control system)

The hill-start assist control will turn off in any of the following situations:

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 may not operate effectively when

Directional control and power may not be achievable while driving on slippery road surfaces, even if the TRAC system is operating.

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

Hill-start assist control (vehicles with a hill-start assist control system)

  • 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.

When the VSC is 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 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 systems off unless necessary.

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 and VSC 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 suspension

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

Active Torque Control 4WD system (AWD models only)

  • The AWD system of this vehicle is intended to ensure driving stability on normal roads. It is not designed for use in demanding situations such as rally driving.
  • Take care when driving on slippery road surfaces.
Things you should know
If you notice any symptoms If you notice any of the following symptoms, refer to the likely cause and the solution, and re-check. If the symptom is not resolved by the solution, have the vehicle ...

PCS (Pre-Collision System)
When the radar sensor detects possibility of a frontal collision, the pre-collision system such as the brakes and seat belts are automatically engaged to lessen impact as well as vehicle damage. Pr ...

Other materials:

When servicing full-time 4wd vehicles
The full-time 4WD SIENNA is equipped with the open center differential system. If incorrect preparations or test procedures are used, the test will not only be unsuccessful, but may be dangerous as well. Therefore, before beginning any such servicing or test, be sure to check the following ...

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Sleep Operation Failure of Occupant Classification ECU
DTC B1796 Sleep Operation Failure of Occupant Classification ECU DESCRIPTION During sleep mode, the occupant classification ECU reads the condition of each sensor while the ignition switch is off. In this mode, if the occupant classification ECU detects an internal malfunction, DTC B1796 ...

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