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304
4-5. Using the driving support systems
Lexus dealer.
■
Operating conditions of hill-start assist
control
When the following four conditions are met,
the hill-start assist control will operate:
●
The shift position is in a position other
than P or N (when stating off for-
ward/backward on an upward incline)
●
The vehicle is stopped
The accelerator pedal is not depressed
●
●
The parking brake is not engaged
Automatic system cancelation of
■
hill-start assist control
The hill-start assist control will turn off in any
of the following situations:
Shift the shift position to P or N
●
The accelerator pedal is depressed
●
●
The parking brake is engaged
2 seconds at maximum elapsed after the
●
brake pedal is released
■
VGRS is disabled when
VGRS may stop operating in the following
situations.
In this event, the steering wheel may move
from its straight forward position, but it will
return when the system restarts.
●
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.
LS500h_OM_(U)_1810
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.
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