Page 323 of 684

323
2-4. Using other 
driving systems
PRIUS PHV_OM_OM47787U_(U)
2
When driving
■Warning  lights,  messages  and  buzzers  for  dynamic  radar  cruise  con-
trol
Warning lights, warning messages and buzzers are used to indicate a sys-
tem malfunction or to inform the driver of the need for caution while driving.
■ Certification
For vehicles sold in the U.S.A.
FCC ID: HYQDNMWR004
This device complies with part 15 of the FCC Rules. Operation is subject to
the following two conditions: (1) This device may not cause harmful interfer-
ence, and (2) this device must accept any interference received, including
interference that may cause undesired operation.
FCC WARNING
Changes or modifications not expressly approved by the party responsible
for compliance could void the user’s authority to operate the equipment.
Radiofrequency radiation exposure Information:
This equipment complies with FCC radiation exposure limits set forth for an
uncontrolled environment. 
This equipment should be installed and operated with minimum distance of
20 cm between the radiator (antenna) and your body.
This transmitter must not be co-located or operating in conjunction with any
other antenna or transmitter.
For vehicles sold in Canada
Operation is subject to the following two conditions: (1) this device may not
cause interference, and (2) this device must accept any interference, includ-
ing interference that may cause undesired operation of the device. 
         
        
        
     
        
        Page 339 of 684

339
2-4. Using other 
driving systems
PRIUS PHV_OM_OM47787U_(U)
2
When driving
■Obstacles not detected
The sensor cannot detect plastic obstacles such as traffic cones. There may
also be occasions when the sensor cannot detect pedestrians, animals,
bicycles, motorcycles, trees, or snowdrifts. 
■ Situations in which the pre-collis ion system does not function properly
The system may not function effectively in situations such as the following:
● On roads with sharp bends or uneven surfaces
● If a vehicle suddenly moves in front of your vehicle, such as at an inter-
section
● If a vehicle suddenly cuts in front of your vehicle, such as when overtak-
ing
● In inclement weather such as heavy rain, fog, snow or sand storms
● When your vehicle is skidding with the VSC system off
● When an extreme change in vehicle height occurs
● When the axis of the radar is out of adjustment
■ Automatic cancelation of the pre-collision system
When a malfunction occurs due to sensor contamination, etc. that results in
the sensors being unable to detect obstacles, the pre-collision system will be
automatically disabled. In this case, the system will not activate even if there
is a collision possibility.
■ When  there  is  a  malfunction  in  the  system,  or  if  th e  system  is  tempo-
rarily unusable
Warning lights and/or warning messages will turn on or flash. ( P. 536, 548) 
         
        
        
     
        
        Page 523 of 684
When trouble arises5
523
PRIUS PHV_OM_OM47787U_(U)
5-1. Essential informationEmergency flashers .........  524
If your vehicle needs to be towed ........................  525
If you think something  is wrong .........................  532
5-2. Steps to take in an  emergency
If a warning light turns  on or a warning buzzer 
sounds ...........................  533
If a warning message  is displayed ....................  546
If you have a flat tire.........  566
If the hybrid system will  not start ..........................  588
If you lose your keys ........  590
If the electronic key does  not operate properly.......  591
If the 12-volt battery is  discharged .....................  594
If your vehicle  overheats .......................  600
If the vehicle becomes  stuck ..............................  605
If your vehicle has to be  stopped in an 
emergency .....................  607 
         
        
        
     
        
        Page 546 of 684
546
5-2. Steps to take in an emergency
PRIUS PHV_OM_OM47787U_(U)
If a warning message is displayed
If a warning is shown on the multi-information display, stay calm and
perform the following actions:
Master warning light
Multi-information display
The master warning light also
comes on or flashes in order to
indicate that a message is cur-
rently being displayed on the
multi-information display.
If any of the warning light turns  on again after performing the fol-
lowing actions, contact your Toyota dealer. 
         
        
        
     
        
        Page 547 of 684
5
When trouble arises
547
5-2. Steps to take in an emergency
PRIUS PHV_OM_OM47787U_(U)
Stop the vehicle immediately.
A buzzer sounds and a warning message is shown on the multi-infor-
mation display. The following warnin gs indicate the possibility of dam-
age to the vehicle that may lead to  an accident. Immediately stop the
vehicle in a safe place and contact your Toyota dealer.
Warning messageDetails
(U.S.A.)
(Canada) Indicates an abnormal engine oil pressure.
The warning light may turn on if the engine oil pres-
sure is too low.
Indicates a malfunction in the hybrid system. 
         
        
        
     
        
        Page 548 of 684
548 5-2. Steps to take in an emergency
PRIUS PHV_OM_OM47787U_(U)
Have the vehicle inspected immediately.Failure to investigate the cause of the following warnings may lead to
the system operating abnormally  and possibly cause an accident.
Have the vehicle inspected by  your Toyota dealer immediately.
Warning messageDetails
(If equipped) Indicates a malfunction in the LED headlight system.
Indicates a malfunction in the P position control sys-
tem.
In this situation, there is a possibility that the parking 
lock mechanism will not work. 
When parking, park the vehicle on a flat surface and 
apply the parking brake securely. Also, it may not be 
possible to turn the “POWER” switch off. If this hap-
pens, applying the parking brake will enable the 
switch to be turned off.
(Flashes)
(If equipped) Indicates a malfunction in the pre-collision system.
A buzzer also sounds. 
         
        
        
     
        
        Page 549 of 684
5
When trouble arises
549
5-2. Steps to take in an emergency
PRIUS PHV_OM_OM47787U_(U)
Warning messageDetails
(Flashes)
(If equipped) Indicates a malfunction in the radar cruise control sys-
tem.
A buzzer also sounds.
Press the “ON-OFF” button once to deactivate the 
system, and then press the button again to reacti-
vate the system.
Hybrid battery (traction battery) inspection or replace-
ment time. Have the hybrid battery (traction battery) inspected 
by your Toyota dealer immediately.
Hybrid system restarting will soon be disabled. A buzzer also sounds.
If you continue to use the vehicle in this state, you 
will soon become unable to restart the hybrid sys-
tem. Have the hybrid battery (traction battery) 
inspected by your Toyota dealer immediately.
Indicates that restarting of the hybrid system is not 
possible. Contact your Toyota dealer immediately. 
         
        
        
     
        
        Page 550 of 684

550 5-2. Steps to take in an emergency
PRIUS PHV_OM_OM47787U_(U)
Follow the correction procedures.After taking the specified steps to  correct the suspected problem,
check that the warning message turns off.
*: Refer to the separate “Scheduled Maintenance Guide” or “Owner’s Manual Supplement” for the maintenance interval applicable to your vehicle.
Warning messageDetailsCorrection procedure
(U.S.A. only) Indicates that all maintenance 
according to the driven dis-
tance on the maintenance 
schedule
* should be per-
formed soon. If necessary, per-
form maintenance.
Comes on approximately 4500 
miles (7200 km) after the main-
tenance data has been reset.
(U.S.A. only) Indicates that all maintenance 
is required to correspond to 
the driven distance on the 
maintenance schedule
*.
Perform the neces-
sary maintenance.
Please reset the 
maintenance data 
after the mainte-
nance is per-
formed. (
P. 432)
Comes on approximately 5000 
miles (8000 km) after the main-
tenance data has been reset.
(The indicator will not work 
properly unless the mainte-
nance data has been reset.)