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6457-2. Steps to take in an emergency
PRIUS_OM_OM47F32E_(EE)
7
When trouble arises
If  your vehicle overheats
■If the high coolant temperature warning light comes on or 
flashes 
Stop the vehicle in a safe place and turn off the air conditioning 
system, and then stop the hybrid system. 
If you see steam:  
Carefully lift the hood after the steam subsides. 
If you do not see steam: 
Carefully lift the hood. 
After the hybrid system has cooled down sufficiently, inspect the 
hoses and radiator core (radiator) for any leaks. 
Radiator 
Cooling fans
If a large amount of coolant 
leaks, immediately contact
any authorized Toyota retailer
or Toyota authorized repairer, 
or any reliable repairer.
The following may indicate that your vehicle is overheating. 
● The high coolant temperature warning light (P. 583) comes on 
or flashes, or a loss of hybrid system power is experienced. (For 
example, the vehicle speed does not increase.) 
● “Hybrid System Overheated” is shown on the multi-information 
display. 
● Steam comes out from under the hood.
Correction procedures
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6477-2. Steps to take in an emergency
PRIUS_OM_OM47F32E_(EE)
7
When trouble arises
Start the hybrid system and turn the air conditioning system on to 
check that the radiator cooling fans operate and to check for 
coolant leaks from the radiator or hoses.
The fans operate when the air condi tioning system is turned on immedi- 
ately after a cold start. Confirm that the fans are operating by checking
the fan sound and air flow. If it is difficult to check these, turn the air con- 
ditioning system on and off repeatedly. (The fans may not operate in 
freezing temperatures.)
If the fans are not operating: 
Stop the hybrid system immediately and contact any authorized 
Toyota retailer or Toyota authorized repairer, or any reliable 
repairer. 
If the fans are operating: 
Have the vehicle inspected at the nearest any authorized Toyota 
retailer or Toyota authorized repairer, or any reliable repairer.
■If “Hybrid System Overheated” is shown on the multi-informa-
tion display 
Stop the vehicle in a safe place. 
Stop the hybrid system and carefully lift the hood. 
After the hybrid system has cooled down, inspect the hoses and 
radiator core (radiator) for any leaks. 
Radiator 
Cooling fans
If a large amount of coolant 
leaks, immediately contact 
any authorized Toyota retailer
or Toyota authorized repairer, 
or any reliable repairer.
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6487-2. Steps to take in an emergency
PRIUS_OM_OM47F32E_(EE)
The coolant level is satisfactory if it is between the “FULL” and 
“LOW” lines on the reservoir. 
Reservoir 
“FULL” line 
“LOW” line 
Add coolant if necessary.
Water can be used in an emer- 
gency if coolant is unavailable. 
If water was added in an emer- 
gency, have the vehicle
inspected at any authorized 
Toyota retailer or Toyota autho- 
rized repairer, or any reliable
repairer as soon as possible.
After stopping the hybrid system and waiting for 5 minutes or 
more, start the hybrid system again and check if “Hybrid System 
Overheated” is shown on the multi-information display. 
If the message does not disappear:  
Stop the hybrid system and contact any authorized Toyota 
retailer or Toyota authorized repairer, or any reliable repairer. 
If the message is not displayed:  
The hybrid system temperature has dropped and the vehicle may 
be driven normally.
However, if the message appears again frequently, contact any autho- 
rized Toyota retailer or Toyota authorized repairer, or any reliable 
repairer.
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6497-2. Steps to take in an emergency
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7
When trouble arises
WARNING
■To prevent an accident or injury when inspecting under the hood of 
your vehicle 
Observe the following precautions. 
Failure to do so may result in serious injury such as burns. 
● If steam is seen coming from under the hood, do not open the hood until 
the steam has subsided. The engine compartment may be very hot. 
● After the hybrid system has been turned off, check that the “Accessory”, 
“Ignition ON” or mileage display ( P. 118, 120) on the main display and 
the “READY” indicator are off.  
When the hybrid system is operating, the gasoline engine may automati- 
cally start, or the cooling fans may suddenly operate even if the gasoline
engine stops. Do not touch or approach rotating parts such as the fan, 
which may lead to fingers or clothing (especially a tie, a scarf or a muffler) 
getting caught, resulting in serious injury. 
● Do not loosen the coolant reservoir caps while the hybrid system and radi- 
ator are hot. 
High temperature steam or coolant could spray out.
NOTICE
■ When adding engine/power control unit coolant 
Add coolant slowly after the hybrid system has cooled down sufficiently. 
Adding cool coolant to a hot hybrid system too quickly can cause damage to 
the hybrid system. 
■ To prevent damage to the cooling system 
Observe the following precautions: 
● Avoid contaminating the coolant with foreign matter (such as sand or dust 
etc.). 
● Do not use any coolant additive. 
         
        
        
     
        
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6598-1. Specifications
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Vehicle specifications
Oil viscosity (0W-16 is explained here as an example):
• The 0W in 0W-16 indicates the characteristic of the oil which
allows cold startability. Oils with a lower value before the W allow
for easier starting of the engine in cold weather.
• The 16 in 0W-16 indicates the viscosity characteristic of the oil
when the oil is at high temperature. An oil with a higher viscosity
(one with a higher value) may be better suited if the vehicle is
operated at high speeds, or under extreme load conditions.
How to read oil container labels:
Either or both API registered marks are added to some oil contain-
ers to help you select the oil you should use.
API Service Symbol
Top portion: “API SERVICE SP”
means the oil quality designa-
tion by American Petroleum Ins-
titute (API).
Center portion: “SAE 0W-16”
means the SAE viscosity grade.
Lower portion: “Resource-
Conserving” means that the oil
has fuel-saving and environ-
mental protection capabilities.
ILSAC Certification Mark
The International Lubricant Specification Advisory Committee (ILSAC)
Certification Mark is displayed on the front of the container.
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6618-1. Specifications
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8
Vehicle specifications
Oil viscosity (0W-20 is explained here as an example):
• The 0W in 0W-20 indicates the characteristic of the oil which
allows cold startability. Oils with a lower value before the W allow
for easier starting of the engine in cold weather.
• The 20 in 0W-20 indicates the viscosity characteristic of the oil
when the oil is at high temperature. An oil with a higher viscosity
(one with a higher value) may be better suited if the vehicle is
operated at high speeds, or under extreme load conditions.
How to read oil container labels:
Either or both API registered marks are added to some oil contain-
ers to help you select the oil you should use.
API Service Symbol
Top portion: “API SERVICE SP”
means the oil quality designa-
tion by American Petroleum Ins-
titute (API).
Center portion: “SAE 0W-20”
means the SAE viscosity grade.
Lower portion: “Resource-Con-
serving” means that the oil has
fuel-saving and environmental
protection capabilities.
ILSAC Certification Mark
The International Lubricant Specification Advisory Committee (ILSAC)
Certification Mark is displayed on the front of the container.
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6708-2. Customization
PRIUS_OM_OM47F32E_(EE)
Customizable features
When customizing vehicle features, ensure that the vehicle is parked
in a safe place with the parking brake set and the shift position in P.
■Changing using the multi-information display
Press   or   of the meter control switches, select  .
Press   or   of the meter control switches, select 
(“Vehicle Settings”), and then press  .
Press   or   of the meter control switches, select the item,
and then press  .
Press   or   of the meter control switches, select the desired
setting, and then press  .
To go back to the previous screen or exit the customize mode,
press .
Your vehicle includes a variety of electronic features that can be
personalized to suit your preferences. The settings of these fea-
tures can be changed using the multi-information display, the
navigation/multimedia system, or at any authorized Toyota
retailer or Toyota authorized repairer, or any reliable repairer.
Some function settings are changed simultaneously with other func-
tions being customized. Contact any authorized Toyota retailer or
Toyota authorized repairer, or any reliable repairer for further details.
Customizing vehicle features
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6718-2. Customization
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8
Vehicle specifications
■Changing using the navigation/multimedia system
Press the “SETUP” button.
Select “Vehicle” on the “Setup” screen and select “Vehicle cus-
tomization”.
Various settings can be changed. Refer to the list of settings that
can be changed for details.
Settings that can be changed using the multi-information display
Settings that can be changed using the navigation/multimedia sys-
tem
Settings that can be changed by any authorized Toyota retailer or
Toyota authorized repairer, or any reliable repairer
Definition of symbols: O = Available, – = Not available
■Instrument cluster (P. 100)
Customizable features
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2
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FunctionDefault 
settingCustomized 
setting
Sensor sensitivity for darken-
ing the brightness of the
instrument cluster depending
on the outside brightness
Standard-2 to 2––O
Sensor sensitivity for returning
the brightness of the instru-
ment cluster to the original
level depending on the outside
brightness
Standard-2 to 2––O
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