Using the driving support systems -> Cruise control for Your Toyota Prius 4 Door Fourth Generation (2016-2022)

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4-5. Using the driving support systems  
Cruise control  
Summary of functions  
Use the cruise control to maintain a set speed without depressing the  
accelerator pedal.  
Use the cruise control on freeways and highways.  
1
Indicators  
2
3
Cruise control switch  
Set speed  
4
: If equipped  
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Setting the vehicle speed  
1
Press the “ON-OFF” button to  
activate the cruise control.  
Cruise control indicator will come  
on.  
Press the button again to deacti-  
vate the cruise control.  
2
Accelerate or decelerate, with  
accelerator pedal operation, to  
the desired vehicle speed  
(above approximately 25 mph  
[40 km/h]) and push the lever  
down to set the speed.  
Cruise control “SET” indicator will  
come on.  
The vehicle speed at the moment  
the lever is released becomes the  
set speed.  
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Adjusting the set speed  
To change the set speed, operate the lever until the desired set speed  
is obtained.  
1
Increases the speed  
Decreases the speed  
2
Fine adjustment: Momentarily  
move the lever in the desired direc-  
tion.  
Large adjustment: Hold the lever in  
the desired direction.  
The set speed will be increased or decreased as follows:  
Fine adjustment: By approximately 1 mph (1.6 km/h) or 1 km/h (0.6 mph)  
each time the lever is operated.  
4
Large adjustment: The set speed can be increased or decreased continu-  
ally until the lever is released.  
Canceling and resuming the constant speed control  
1
Pulling the lever toward you  
cancels the constant speed  
control.  
The speed setting is also canceled  
when  
the  
brake  
pedal  
is  
depressed.  
2
Pushing the lever up resumes  
the constant speed control.  
However, resuming is available  
when the vehicle speed is more  
than  
approximately  
25 mph  
(40 km/h).  
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Cruise control can be set when  
The shift position is in D.  
Vehicle speed is above approximately 25 mph (40 km/h).  
Accelerating after setting the vehicle speed  
The vehicle can be accelerated by operating accelerator pedal. After accel-  
erating, the set speed resumes.  
Even without canceling the cruise control, the set speed can be increased  
by first accelerating the vehicle to the desired speed and then pushing the  
lever down to set the new speed.  
Automatic cancelation of cruise control  
Cruise control is automatically canceled in any of the following situations.  
Actual vehicle speed falls more than approximately 10 mph (16 km/h) below  
the set speed.  
At this time, the memorized set speed is not retained.  
Actual vehicle speed is below approximately 25 mph (40km/h).  
VSC is activated.  
TRAC is activated for a period of time.  
When the VSC or TRAC system is turned off by pressing the VSC OFF  
switch.  
Parking Support Brake function is operated. (if equipped)  
If “Check Cruise Control System Visit Your Dealer” is displayed on the  
multi-information display  
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 imme-  
diately after being activated, there may be a malfunction in the cruise control  
system. Have the vehicle inspected by your Toyota dealer.  
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WARNING  
To avoid operating the cruise control by mistake  
Switch the cruise control off using the “ON-OFF” button when not in use.  
Situations unsuitable for cruise control  
Do not use cruise control in any of the following situations.  
Doing so may result in loss of control and could cause an accident resulting  
in death or serious injury.  
Roads where there are pedestrians, cyclists, etc.  
In heavy traffic  
On roads with sharp bends  
On winding roads  
On slippery roads, such as those covered with rain, ice or snow  
On sharp inclines or declines  
Vehicle speed may exceed the set speed when driving down a steep hill.  
During emergency towing  
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