Lexus GS450h Owner's Manual page 328

328
4-5. Using the driving support systems
Sounds and vibrations caused by the ABS, brake assist, VSC, Hill-start assist control,
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TRC and VGRS systems
Any of the following conditions may occur when the above systems are operating. None
of these indicates that a malfunction has occurred.
Vibrations may be felt through the vehicle body and steering.
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A motor sound may be heard after the vehicle comes to a stop.
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ECB operation sound
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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 oper-
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ated.
Motor sounds of the brake system heard from the front part of the vehicle when the
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driver's door is opened.
Operating sound heard from the engine compartment when one or two minutes
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passed after the stop of the hybrid system.
EPS, VGRS and DRS operation sound
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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
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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
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If only the TRC system is turned off, the TRC will turn on when vehicle speed increases
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If both TRC and VSC systems are turned off, automatic re-enabling will not occur when
vehicle speed increases.
Reduced effectiveness of the EPS system
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The effectiveness of the EPS system is reduced to prevent the system from overheating
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 nor-
mal within 10 minutes.
Operating conditions of hill-start assist control
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When the following four conditions are met, the hill-start assist control will operate;
The shift lever is in a position other than N or P (when starting off forward/backward on
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an upward incline).
The vehicle is stopped.
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The accelerator pedal is not depressed.
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The parking brake is not engaged.
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