Driving Assist Systems - Lexus RX 450h Owner's Manual

376 4-5. Using the driving support systems

Driving assist systems

To keep driving safety and perfor-
mance, the following systems oper-
ate automatically in response to
various driving situations. Be aware,
however, that these systems are
supplementary and should not be
relied upon too heavily when oper-
ating the vehicle.
Summary of the driving assist
systems
ECB (Electronically Controlled
■
Brake System)
The electronically controlled system
generates braking force correspond-
ing to the brake operation
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 brak-
ing 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
Provides cooperative control of the
ABS, TRC, VSC and EPS.
Helps to maintain directional stability
� � � � � � � � � � � � � � � � �
when swerving on slippery road sur-
faces by controlling steering perfor-
mance.
Trailer Sway Control (if equipped)
■
Helps the driver to control trailer sway
by selectively applying brake pressure
for individual wheels and reducing
driving torque when trailer sway is
detected.
TRC (Traction Control)
■
Helps to maintain drive power and pre-
vent the drive wheels from spinning
when starting the vehicle or accelerat-
ing on slippery roads
Active Cornering Assist (ACA)
■
Helps to prevent the vehicle from drift-
ing to the outer side by performing
inner wheel brake control when
attempting to accelerate while turning
Hill-start assist control
■
Helps to reduce the backward move-
ment of the vehicle when starting on an
uphill
EPS (Electric Power Steering)
■
Employs an electric motor to reduce
the amount of effort needed to turn the
steering wheel
E-Four
■
Electronic On-Demand AWD system.
Automatically switches from
front-wheel drive to all-wheel drive
(AWD) according to the driving condi-
tions, helping to ensure reliable han-
dling and stability. Examples of
conditions where the system will switch