2012 TOYOTA PRIUS V engine coolant

423
4-3. Do-it-yourself maintenance
PRIUS v_U (OM47784U)
4
Maintenance and care
Replacing light bulbs
■ Headlight low beams (halogen headlights)
For the right side only: Remove
the bolt and unclip the engine
coolant reservoir hose. Then lift
up the air cleaner inlet duct.
After replacing, return the air
cleaner inlet duct to its original
position, and firmly install the stay
of the engine coolant reservoir
hose.
STEP 1

425
4-3. Do-it-yourself maintenance
PRIUS v_U (OM47784U)
4
Maintenance and care
■
Daytime running lights and headlight high beams
For the right side only: Remove the bolt and unclip the engine
coolant reservoir hose. Then lif t up the air cleaner inlet duct.
(  P. 423)
Turn the bulb base counterclockwise.
Vehicles with halogen headlights
Vehicles with LED headlights
Unplug the connector while
pressing the lock release.
When installing, reverse the steps listed.
STEP 1
STEP 2
STEP 3
STEP 4

426 4-3. Do-it-yourself maintenance
PRIUS v_U (OM47784U)
■Parking lights
For the right side only: Remove the bolt and unclip the engine
coolant reservoir hose. Then lif t up the air cleaner inlet duct.
(  P. 423)
Turn the bulb base counterclockwise.
Vehicles with halogen headlights
Vehicles with LED headlights
Remove the light bulb.
When installing, reverse the steps listed.
STEP 1
STEP 2
STEP 3
STEP 4

427
4-3. Do-it-yourself maintenance
PRIUS v_U (OM47784U)
4
Maintenance and care
■
Front side marker lights
For the right side only: Remove the bolt and unclip the engine
coolant reservoir hose. Then lif t up the air cleaner inlet duct.
(  P. 423)
Turn the bulb base counterclockwise.
Vehicles with halogen headlights
Vehicles with LED headlights
Remove the light bulb.
When installing, reverse the steps listed.
STEP 1
STEP 2
STEP 3
STEP 4

5
When trouble arises
443
5-1. Essential information
PRIUS v_U (OM47784U)
If you think something is wrong
If you notice any of the following symptoms, your vehicle probably
needs adjustment or repair. Contact your Toyota dealer as soon as
possible.
■ Visible symptoms
●Fluid leaks under the vehicle
(Water dripping from the air cond itioning after use is normal.)
● Flat-looking tires or uneven tire wear
● High engine coolant temperatur e warning light flashes or
comes on
■ Audible symptoms
●Changes in exhaust sound
● Excessive tire squeal when cornering
● Strange noises related to the suspension system
● Pinging or other noises related to the hybrid system
■ Operational symptoms
●Engine missing, stumbling or running roughly
● Appreciable loss of power
● Vehicle pulls heavily to one side when braking
● Vehicle pulls heavily to one side when driving on a level road
● Loss of brake effectiveness, s pongy feeling, pedal almost
touches the floor

5
When trouble arises
445
5-2. Steps to take in an emergency
PRIUS v_U (OM47784U)
Stop the vehicle immediately.
The following warning indicates the possibility of damage to the vehi-
cle that may lead to an accident. Immediately stop the vehicle in a
safe place and contact your Toyota dealer.
Warning lightWarning light/Details
Charging system warning light Indicates a malfunction in the vehicle’s charging system
Low engine oil pressure warning light Indicates that the engine oil pressure is too low
High coolant temper ature warning light
Indicates that the coolant temperature is too high
Changes from a flashing to a solid light when the engine
coolant temperature increases.
Hybrid system warning light (warning buzzer) Indicates a malfunction in the hybrid system

5
When trouble arises
487
5-2. Steps to take in an emergency
PRIUS v_U (OM47784U)
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.
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.
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.
● The hybrid system overhe at warning light comes on:
The power control unit may be overheating.
Follow the correction procedure as described below.
STEP 1
STEP 2
STEP 3

488 5-2. Steps to take in an emergency
PRIUS v_U (OM47784U)
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. 501)
Have the vehicle checked at nearest Toyota dealer as soon as possi-
ble.
■If the hybrid system overheat warning light comes on
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 the hybrid system overheat warning light turns off
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.
STEP 4
STEP 5
STEP 1
STEP 2
STEP 3