Lexus GS 450h2011 Manual page 181

Cruise control can be set when
■
The shift lever is in the D or "4", "5", or "6" range of S has been selected.
●
Vehicle speed is above approximately 25 mph (40 km/h).
●
Accelerating
■
The vehicle can be accelerated normally. After acceleration, the set speed
resumes.
Automatic cruise control cancelation
■
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 vehicle
●
speed
At this time, the memorized set speed is not retained.
Actual vehicle speed is below 25 mph (40 km/h)
●
Enhanced VSC is activated
●
If the cruise control indicator light flashes
■
Press 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.
GS_HV_U (OM30C14U)
May 21, 2010 2:41 pm
2-4. Using other driving systems
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