Toyota 2009 Corolla Owner's Manual page 178

Automatic cruise control cancellation
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The set speed is automatically canceled in any of the following situations.
Actual vehicle speed falls more than 10 mph (16 km/h) below the preset
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vehicle speed.
At this time, the memorized set speed is not retained.
Actual vehicle speed is below 25 mph (40 km/h).
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VSC is activated.
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If the cruise control indicator light flashes
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Press the "ON-OFF" button once to deactivate the system, and then press
the button again to reactivate the system.
If the cruise control speed cannot be set or if the cruise control cancels
immediately after being activated, there may be a malfunction in the cruise
control system. Contact your Toyota dealer and have your Toyota inspected.
CAUTION
To avoid operating the cruise control by mistake
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Keep the "ON-OFF" button off when not in use.
Situations unsuitable for cruise control
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Do not use cruise control in any of the following situations.
Doing so may result in control of the vehicle being lost and could cause seri-
ous or fatal accident.
In heavy traffic
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l On roads with sharp bends
On winding roads
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On slippery roads, such as those covered with rain, ice or snow
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l On steep hills
2-4. Using other driving systems
I n f o r ma t i o n P r o v i d e d b y :
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