2012 TOYOTA PRIUS warning light

522 5-2. Steps to take in an emergency
InteriorbuzzerExterior buzzerWarning messageDetailsCorrection procedure
Once 
(Flashes)The elec-
tronic key
does not
operate
properly.
P. 541
 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 recharge
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.

532 5-2. Steps to take in an emergency
Pass the belt through the buckle
and secure the tire firmly. Check
that the belt is securely held by
the buckle.
The belt cannot be fastened
securely if the buckle is facing
the wrong direction.
STEP 4
■The compact spare tire
●The compact spare tire is identified by the label “TEMPORARY USE
ONLY” on the tire sidewall.
Use the compact spare tire temporarily, and only in an emergency.
●Make sure to check the tire inflation pressu re of the compact spare
tire. ( P. 569)
■After completing the tire change
The tire pressure warnin g system must be reset. ( P. 439)
■When using the compact spare tire
As the compact spare tire is not equipped with a tire pressure warning
valve and transmitter, low inflation pressure of the spare tire will not be
indicated by the tire pressure warn ing system. Also, if you replace the
compact spare tire after the tire pressure warning light comes on, the
light remains on.

5
When trouble arises
549
5-2. Steps to take in an emergency
If your vehicle overheats
Correction procedures■ If the high coolant temperature warning light flashes or comes
on
Stop the vehicle in a safe place and turn off the air condition-
ing system.
Check to see if steam is coming out from under the hood.
If you see steam: Stop the hybrid system. Carefully lift the hood after the
steam subsides and then restart the hybrid system.
If you do not see steam: Leave the hybrid system operating and carefully lift the
hood.
The following may indicate that your vehicle is overheating:
●The high coolant temperature warn ing light flashes or comes on:
The engine may be overheating.
● “HYBRID SYSTEM OVERHEAT” is shown on the multi-informa-
tion display:
The power control unit may be overheating.
Follow the correction procedure as described below.
STEP 1
STEP 2

550 5-2. Steps to take in an emergency
Check to see if the cooling fans are operating.
If the fans are operating: Wait until the high coolant temperature warning light goes
off and then stop the hybrid system.
If the fans are not operating: Stop the hybrid system immediately and call your Toyota
dealer.
After the hybrid system has
cooled down sufficiently, check
the engine coolant level and
inspect the cooling system for
leaks.
If necessary, add engine coolant
up to the “FULL” line.
Water can be used in an emer-
gency measure if engine coolant
is unavailable. (P. 566)
Have the vehicle checked at nearest Toyota dealer as soon as possi-
ble.
STEP 3
STEP 4
ITO52P130
STEP 5

5
When trouble arises
551
5-2. Steps to take in an emergency
■
If “HYBRID SYSTEM OVERHEAT” is shown on the multi-infor-
mation display
Stop the vehicle in a safe place and turn off the air condition-
ing system.
Leave the hybrid system operating and carefully lift the hood.
Check if the cooling fans are operating.
If the fans are operating: Wait until “HYBRID SYSTEM OVERHEAT” disappears and
then stop the hybrid system.
If the warning light does not turn off, call your Toyota dealer.
If the fans are not operating: Stop the hybrid system immediately and call your Toyota
dealer.
After the hybrid system has
cooled down, check the power
control unit coolant level and
inspect the cooling system for
leaks.
STEP 1
STEP 2
STEP 3
STEP 4

618
Alphabetical index
Alphabetical index
A/CAutomatic air conditioning system ................................ 326
ABS ........................................... 296
Active head restraint ............... 100
Air conditioning system Automatic air conditioning
system ................................ 326
Remote Air Conditioning System ................................ 342
Steering wheel climate remote control switches ...... 337
Airbags
Airbag operating conditions............................ 144
Airbag precautions for your
child .................................... 148
Airbag warning light............... 495
Curtain shield airbag operating conditions............................ 144
Curtain shield airbag precautions ......................... 148
Front passenger occupant classification system ........... 154
General airbag precautions ... 148
Knee airbag ........................... 140
Locations of airbags .............. 140
Modification and disposal of
airbags ................................ 153
Proper driving posture ........... 138
Side airbag operating conditions............................ 144
Side airbag precautions ........ 148
Side and curtain shield airbags operating conditions............ 144
Side and curtain shield airbags precautions ......................... 148
SRS airbags .......................... 140
SRS airbag instructions for
Canadian owners. ............... 603 Antenna .................................... 398
Anti-lock brake system ........... 296
Armrest ..................................... 371
Audio input
*............................. 352
Audio remote control switches
*
Audio system*
Audio/video system*
Automatic air conditioning system
Air conditioning system ......... 326
Automatic air conditioning system ................................ 326
Remote Air Conditioning System................................ 342
Steering wheel climate
remote control switches ...... 337
Automatic headlight leveling system .................................... 255
Automatic light control system .................................... 250
AUX port
*................................. 352
Auxiliary box .................... 363, 376
A

620 Alphabetical index
Child safetyAirbag precautions ................148
Back door precautions ............95
Child restraint system............ 160
Child-protectors .......................88
How your child should wear
the seat belt ........................ 111
Installing child restraints ........ 165
Power window lock switch..... 123
Power window precautions ... 125
Removed electronic key battery
precautions ......................... 455
Seat belt extender precautions ......................... 116
Seat belt precautions ............ 112
Seat heater precautions ........ 370
12-volt battery precautions .... 434
Child-protectors .........................88
Cleaning Exterior .................................. 396
Interior ................................... 399
Seat belts .............................. 400
Clock ......................................... 230
Condenser ................................ 426
Console box ............................. 359
Cooling system
Engine overheating ............... 549
Hybrid system overheating.... 549
Cruise control
Cruise control ........................ 266
Dynamic radar cruise control ................................. 270
Cup holders .............................. 360
Curtain shield airbags ............. 140
Customizable features............. 590 Daytime running light
system .................................... 253
Deck board ............................... 374
Defogger Rear window ......................... 346
Side mirrors........................... 346
Dimensions .............................. 560
Dinghy towing .......................... 323
Display Dynamic radar cruise control ................................. 270
Multi-information ................... 223
Warning messages ............... 507
Do-it-yourself maintenance .... 410
Door lock
Back door ................................ 93
Side doors ............................... 87
Smart key system .. ................. 61
Wireless remote control .......... 85
Doors
Back door ................................ 93
Door glasses ......................... 123
Door lock ..................... 61, 85, 87
Rear door child-protector ........ 88
Side doors ............................... 87
Driver’s seat belt reminder
light ......................................... 498
Driving Break-in tips .......................... 181
Correct posture ..................... 138
Procedures............................ 180
Winter driving tips ................. 317D

621
Alphabetical index
Eco drive mode switch ........... 204
Electric power steering........... 296
Electronic key
If the electronic key does not operate properly ................. 541
Replacing battery ................. 454
Emergency, in case of If a warning buzzer
sounds ............................... 493
If a warning light turns on ..... 493
If the electronic key does not operate properly ................. 541
If the hybrid system will not start .................................... 538
If the 12-volt battery is discharged ......................... 543
If you have a flat tire ............ 523
If you lose your keys............. 540
If you think something is wrong ................................. 492
If your vehicle becomes stuck................................... 554
If your vehicle has to be
stopped in an
emergency ......................... 556
If your vehicle needs to be
towed ................................. 485
If your vehicle overheats ...... 549
Emergency flashers
Switch ................................... 484 Engine
Accessory mode....................194
Compartment ........................419
Hood......................................413
How to start the hybrid
system ................................192
Identification number .............561
If the hybrid system will not start .....................................538
Ignition switch........................192
Overheating...........................549
“POWER” switch ...................192
Engine coolant Capacity ................................566
Checking ...............................424
Preparing and checking before winter .......................317
Engine/power control unit coolantCapacity ................................566
Checking ...............................424
Preparing and checking before winter .......................317
Engine oil Capacity ................................563
Checking ...............................420
Preparing and checking before winter .......................317
Enhanced VSC .........................296
EPS ............................................296
EV drive mode switch ..............199
Event data recorder ...................25E