E-Four (Awd Models); Adaptive Variable Suspension System; Vdim (Vehicle Dynamics Integrated Management); Trailer Sway Control - Lexus rx450h Service Manual

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4-5. Using the driving support systems

E-Four (AWD models)

Electronic On-Demand AWD system. Automatically switches from front-

wheel drive to all-wheel drive (AWD) according to the 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, rain, etc.

Adaptive Variable Suspension System (if equipped)

Controls the damping force of the shock absorber of each wheel according to

the road and driving conditions, helping achieve a comfortable ride, excellent

driveability and a high level of stability.

If SPORT S+ mode is selected using the driving mode select switch, the

damping force will become more suitable for sporty driving. (P. 378)

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 hybrid system output

Helps the driver to control trailer sway by selectively applying brake pressure

for individual wheels and reducing driving torque when trailer sway is

Trailer Sway Control is part of the VSC system and will not operate if VSC

turned off or experiences a malfunction.

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