Set Control
WARNING: This page is about a different car, the 2008 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
If the cruise control switch is pushed to - SET side and released while driving, (The available range of settable speeds: between 40 and 200 km/h) and the ON-OFF switch is ON (Power indicator is on), the device stores vehicle speed at that time and controls it to remain at the set speed.