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Sounds and vibrations caused by the
■
ABS, brake assist, VSC, TRAC, 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 hybrid
system is started or just after the vehicle
begins to move. This sound does not indi-
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.
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, 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 TRAC and
■
VSC systems
After turning the TRAC 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 TRAC system is turned off, the
TRAC will turn on when vehicle speed
increases
If both the TRAC and VSC systems are
turned off, automatic re-enabling will not
occur when vehicle speed increases.
LS500h_OM_OM50F42U_(U)
4-5. Using the driving support systems
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.
Secondary Collision Brake operating
■
conditions
The vehicle speed is approximately 6 mph
(10 km/h) or more and the airbag sensor
detects a collision. (The Secondary Colli-
sion Brake will not operate when the vehicle
speed is below approximately 6 mph [10
km/h].)
Secondary Collision Brake automatic
■
cancellation
The Secondary Collision Brake is automati-
cally canceled in the following situations:
●
The vehicle speed drops below approxi-
mately 6 mph (10 km/h)
A certain amount of time elapses during
●
operation
●
The accelerator pedal is depressed a
large amount
When "Check VGRS System" or
■
"CHECK DRS" is displayed on the
multi-information display
The VGRS or DRS may not operate prop-
erly. Have the vehicle inspected by your
Lexus dealer.
WARNING
The ABS does not operate effectively
■
when
●
The limits of tire gripping performance
have been exceeded (such as exces-
sively worn tires on a snow covered
road).
●
The vehicle hydroplanes while driving
at high speed on wet or slick roads.
305
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