Lexus IS300H 2017 Manual page 355

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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When the 12-volt battery is disconnected
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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, TRC, VSC and hill-start assist
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control systems
A sound may be heard from the engine compartment when the brake pedal is
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depressed repeatedly, when the 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 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 also after the vehicle comes to a stop.
ECB operating 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 sound 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 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.
4-5. Using the driving support systems
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