Steering Wheel Grip Sensor
While driving the vehicle with the Driver Assistance system on, it detects whether the driver is holding the steering wheel and displays the Hands-off warning when the driver is not holding the steering wheel.
For more details, refer to Hands-off warning of

The steering wheel sensor may not work properly if the following precautions are not followed.
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Do not modify the steering wheel cover.
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Do not attach accessories on the rim of the steering wheel.
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Do not let the steering wheel come in contact with electronic devices (for example, laptops, tablets, etc.).
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Do not let the steering wheel come in contact with metallic or conductive objects (for example, tumblers, beverage cans, etc.).
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Avoid excessive contact with moisture (for example, wet tissues, spilled water, vapor from steam wash, etc.).
When the driver is wearing gloves or accessories such as a cover, steering wheel knobs, any other attachments are attached to the steering wheel, the sensor may fail to detect the driver’s hands even when the driver is holding the steering wheel.