Page 559 of 688
5
When trouble arises
559
5-2. Steps to take in an emergency
PRIUS PHV_OM_OM47856U_(U)
Have the malfunction repaired immediately.
After taking the specified steps to correct the suspected problem,
check that the warning message and light turn off.
InteriorbuzzerExterior buzzerWarning messageDetailsCorrection procedure
Once 
(Comes on for 15 seconds.)
(Flashes) The electronic 
key is not 
detected when 
attempting to 
start the hybrid 
system.
Confirm 
the loca-
tion of the 
electronic 
key.
Once 3 times (Flashes)An open door 
other than the 
driver’s door is 
closed while the 
electronic key is 
outside the 
detection range 
and the 
“POWER” 
switch is in 
ACCESSORY 
or ON mode.
Confirm 
the loca-
tion of the 
electronic 
key. 
         
        
        
     
        
        Page 560 of 688
560 5-2. Steps to take in an emergency
PRIUS PHV_OM_OM47856U_(U)
InteriorbuzzerExterior buzzerWarning messageDetailsCorrection procedure
Once 3 times (Flashes)The driver’s 
door is opened 
and closed 
while the elec-
tronic key is out-
side the 
detection range 
and the 
“POWER” 
switch is in 
ACCESSORY 
or ON mode 
with the shift 
position in P. Turn the 
“POWER” 
switch to 
OFF or 
confirm 
the loca-
tion of the 
electronic 
key.
Contin-
uous 
(Flashes)The driver’s 
door has been 
opened with the 
shift position in 
a position other 
than P and with-
out first turning 
the “POWER” 
switch is OFF.
Shift the 
shift posi-
tion to P. 
         
        
        
     
        
        Page 561 of 688
5
When trouble arises
561
5-2. Steps to take in an emergency
PRIUS PHV_OM_OM47856U_(U)
Interior
buzzerExterior buzzerWarning messageDetailsCorrection procedure
Once Contin-
uous
(Displayed alternately)(Flashes) The electronic 
key has been 
taken outside 
the vehicle and 
the doors have 
been locked 
without first 
turning the 
“POWER” 
switch to OFF. 
(vehicles with 
entry function)
Turn the 
“POWER” 
switch to 
OFF and 
lock the 
doors 
again. 
         
        
        
     
        
        Page 562 of 688
562 5-2. Steps to take in an emergency
PRIUS PHV_OM_OM47856U_(U)
InteriorbuzzerExterior buzzerWarning messageDetailsCorrection procedure
Once Contin-
uous
(Flashes)An attempt to 
lock the doors 
has been made 
using the smart 
key system 
while the elec-
tronic key is 
inside the vehi-
cle. (vehicles 
with entry func-
tion)
Take the 
electronic 
key out-
side the 
vehicle, 
and lock 
the doors 
again.
With the key 
inside the vehi-
cle, a front door 
has been 
opened, the 
lock lever has 
been pulled in 
the lock direc-
tion, the door 
has been 
closed and an 
attempt has 
been made to 
lock the door. 
         
        
        
     
        
        Page 563 of 688
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When trouble arises
563
5-2. Steps to take in an emergency
PRIUS PHV_OM_OM47856U_(U)
Interior
buzzerExterior buzzerWarning messageDetailsCorrection procedure
Contin-
uous Contin-
uous
(Displayed alternately)(Flashes) The driver’s 
door is opened 
and closed 
while the elec-
tronic key is out-
side the 
detection range 
and the 
“POWER” 
switch is in 
ACCESSORY 
or ON mode 
with the shift 
position not in P.
• Shift the 
shift posi-
tion to P.
• Confirm  the loca-
tion of the 
electronic 
key.
Once 
(Comes on for 15 seconds.)
The electronic 
key battery is 
low. Replace 
the bat-
tery. 
(
P. 496)
Once 
(Flashes)An open door 
has been 
closed and the 
“POWER” 
switch has been 
turned twice to 
the ACCES-
SORY mode 
from OFF. Press the 
“POWER” 
switch 
while 
applying 
the 
brakes. 
         
        
        
     
        
        Page 564 of 688
564 5-2. Steps to take in an emergency
PRIUS PHV_OM_OM47856U_(U)
InteriorbuzzerExterior buzzerWarning messageDetailsCorrection procedure
Once 
(Flashes)The elec-
tronic key 
does not 
operate 
properly.
P. 594
 Power 
was 
turned off 
due to 
the auto-
matic 
power off 
function.Next time when 
starting the 
hybrid system, 
increase the 
engine speed 
slightly and 
maintain that 
level for approxi-
mately 5 min-
utes to charge 
the battery.
NOTICE
■
While the engine oil level warning is displayed
Continued engine operation with low engine oil will damage the engine.
■ Engine oil maintenance message
The warning message is based on the projected driving range after engine
oil maintenance message is reset. 
The system does not monitor the purity of the engine oil. 
         
        
        
     
        
        Page 591 of 688

5
When trouble arises
591
5-2. Steps to take in an emergency
PRIUS PHV_OM_OM47856U_(U)
If the hybrid system will not start
Reasons  for  the  hybrid  system  not  starting  vary depending  on  the
situation.  Check  the  following  a nd  perform  the  appropriate  proce-
dure: 
■ The  hybrid  system  will  not  start  even  though  the  correct
starting procedure is being followed ( P. 240)
One of the following may be the cause of the problem:
● The charging cable may be attached to the vehicle. ( P. 95)
● The electronic key may not be functioning properly.
* 
(  P. 594)
● There may not be sufficient fuel in the vehicle’s tank.
Refuel the vehicle. ( P.  4 6 )
● There may be a malfunction in the immobilizer system.
* 
(  P. 183)
● There may be a malfunction in the P position control system.
*
( P. 245, 550)
*: It may not be possible to shift the shift position from P to other posi-
tion.
■ The interior lights and headlight s are dim, or the horn does
not sound or sounds at a low volume
One of the following may be the cause of the problem:
● The 12-volt battery may be discharged. ( P. 597)
● The 12-volt battery terminal c onnections may be loose or cor-
roded. 
         
        
        
     
        
        Page 593 of 688
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593
5-2. Steps to take in an emergency
PRIUS PHV_OM_OM47856U_(U)
If you lose your keys
New  genuine  keys  can  be  made  by  your  Toyota  dealer  using  the
other key and the key number stamped on your key number plate.