Lexus GS 350 Owner's Manual page 355

354
4-5. Using the driving support systems
Sounds and vibrations caused by the ABS, brake assist, VSC, TRC, hill-start assist con-
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trol and VGRS systems
A sound may be heard from the engine compartment when the brake pedal is
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depressed repeatedly, when the engine is started or just after the vehicle begins to
move. This sound does not indicate that a malfunction has occurred in any of these sys-
tems.
Any of the following conditions may occur when the above systems are operating.
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None of these indicates that a malfunction 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.
• The brake pedal may pulsate slightly after the ABS is activated.
• The brake pedal may move down slightly after the ABS is activated.
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 engine 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 engine off. The EPS system should return to normal
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 P or N (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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Automatic system cancelation of hill-start assist control
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The hill-start assist control will turn off in any of the following situations:
The shift lever is shifted to P or N.
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The accelerator pedal is depressed.
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The parking brake is engaged.
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Approximately 2 seconds elapse after the brake pedal is released.
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GS350_300_GS F_OM_OM30J17E_(GE)