Lexus GS 450h 2008 Owner's Manual page 170

2-4. Using other driving systems
If the cruise control indicator light flashes
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Turn the "ON-OFF" button off once, and then 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. Have
the vehicle inspected by your Lexus dealer.
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 serious or
fatal accident.
In heavy traffic
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On roads with sharp bends
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On slippery roads, such as those covered with rain, ice or snow
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On steep hills
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Vehicle speed may exceed the set speed when driving down a steep hill.
On winding roads
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