Lexus ES 300h Owner's Manual page 331

330
4-5. Using the driving support systems
cate that a malfunction has occurred in
any of these systems.
● Any of the following conditions may
occur when the above systems are oper-
ating. None of these indicates that a mal-
function 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.
Active Cornering Assist operation
■
sounds and vibrations
When the Active Cornering Assist is oper-
ated, operation sounds and vibrations may
be generated from the brake system, but
this is not a malfunction.
ECB operating sound
■
ECB operating sound may be heard in the
following cases, but it does not indicate that
a malfunction has occurred.
Operating sound heard from the engine
●
compartment when the brake pedal is
operated.
● Motor sound of the brake system heard
from the front part of the vehicle when
the driver's door is opened.
● Operating sound heard from the engine
compartment when one or two minutes
passed after the stop of the hybrid sys-
tem.
EPS operation sound
■
When the steering wheel is operated, a
motor sound (whirring sound) may be
heard. This does not indicate a malfunction.
Automatic reactivation of TRC and
■
VSC systems
After turning the TRC and VSC systems off,
the systems will be automatically re-
enabled in the following situations:
● When the power switch is turned off
● If only the TRC system is turned off, the
TRC will turn on when vehicle speed
increases
If both the TRC and VSC systems are
turned off, automatic re-enabling will not
occur when vehicle speed increases.
Secondary Collision Brake operating
■
conditions
The system operates when the SRS airbag
sensor detects a collision while the vehicle
is in motion.
However, the system does not operate in
any of the following situations:
● The vehicle speed is below 10 km/h (6
mph)
Components are damaged
●
■ Secondary Collision Brake automatic
cancellation
The system is automatically canceled in any
of the following situations:
The vehicle speed drops below approxi-
●
mately 10 km/h (6 mph)
● A certain amount of time elapses during
operation
The accelerator pedal is depressed a
●
large amount
■ Operating conditions of Active Corner-
ing Assist
The system operates when the following
occurs.
TRC/VSC can operate
●
● The driver is attempting to accelerate
while turning
The system detects that the vehicle is
●
drifting to the outer side
● The brake pedal is released
Reduced effectiveness of the EPS sys-
■
tem
The effectiveness of the EPS system is
reduced to prevent the system from over-
heating 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 hybrid system off. The EPS system
should return to normal within 10 minutes.
■ Operating conditions of emergency
brake signal
When the following conditions are met, the