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4-5. Using the driving support systems
● When the steering wheel is operated for
an extended period of time while the
vehicle is stopped or is moving very
slowly (on vehicles with LDH, DRS is dis-
abled together with VGRS)
● When the steering wheel has been held
fully to the left or right
The center position of the steering wheel
may change when VGRS is disabled. How-
ever, the position will return to normal after
VGRS is reactivated.
■ When the 12-volt battery is discon-
nected (vehicles with VGRS)
The steering wheel may move from its
straight forward position, but this will be
corrected automatically when driving.
■ Sounds and vibrations caused by the
ABS, brake assist, VSC, TRC, hill-start
assist control and VGRS systems
● A sound may be heard from the engine
compartment when the brake pedal is
depressed repeatedly, when the engine
<hybrid system> 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 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 after the
vehicle comes to a stop.
■ 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 engine
<hybrid system>.
■ EPS, VGRS and DRS 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 engine switch <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 vehicle speed is approximately 10 km/h
(6 mph) or more and the airbag sensor
detects a collision. (The Secondary Colli-
sion Brake will not operate when the vehicle
speed is below approximately 10 km/h [6
mph].)
■ Secondary Collision Brake automatic
cancellation
The Secondary Collision Brake is automati-
cally canceled in 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
■ If “Secondary Collision Brake system
Malfunction” is displayed on the multi-
information display
The system may be malfunctioning. Have
the vehicle inspected at your Lexus dealer.
■ Reduced effectiveness of the EPS sys-
tem
The effectiveness of the EPS system is
reduced to prevent the system from over-
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