2010 Lexus IS 250 Owners Manual - Page 274

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2-4. Using other driving systems

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Dynamic radar cruise control can be set when

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The shift lever is in the D or range 4 or higher of S has been selected.

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Range 4 or higher has been selected by using the paddle shift.

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Vehicle speed is above approximately 30 mph (50 km/h).

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Switching modes

The mode cannot be switched to constant speed control mode if vehicle-to-vehicle

distance control mode has been used. The mode also cannot be switched from

constant speed control to vehicle-to-vehicle distance control mode. Turn the sys-

tem off by pressing the “ON-OFF” button, and turn it on again.

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Accelerating

The vehicle can accelerate normally. After acceleration, the set speed resumes.

However, during vehicle-to-vehicle distance control mode, the vehicle speed may

decrease below the set speed in order to maintain the distance to the vehicle

ahead.

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Automatic cancelation of vehicle-to-vehicle distance control

Vehicle-to-vehicle distance control driving is automatically canceled in the follow-

ing situations.

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Actual vehicle speed falls below approximately 25 mph (40 km/h).

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VSC is activated.

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The sensor cannot operate correctly because it is covered in some way.

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The windshield wipers are operating at high speed.

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The driving mode select switch is set to snow mode.

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When the shift lever is in the D position and any of the ranges 1 through 3 is

selected using the “-” paddle shift switch.

If vehicle-to-vehicle distance control driving is automatically canceled for any other

reason, there may be a malfunction in the system. Contact your Lexus dealer.