battery TOYOTA PRIUS 2008 2.G Workshop Manual

376 4-3. Do-it-yourself maintenance
PRIUS_U_(L/O_0802)
■Before recharging
When recharging, the 12 volt battery produces hydrogen gas which is flam-
mable and explosive. Therefore, before recharging:
● If recharging with the 12 volt battery installed on the vehicle, be sure to
disconnect the ground cable.
● Make sure the power switch on the charger is off when connecting and
disconnecting the charger cables to the 12 volt battery.
■ After recharging/reconnecting the 12 volt battery
In some cases, the hybrid system may not start. Follow one or both of the
following procedures:
● After opening and closing the driver’s door, wait 10 seconds then attempt
to start the engine. (If the system does not start first time, repeat the pro-
cedure.)
● With the shift lever in “P” and the “POWER” switch in the OFF mode,
open and close any door, then attempt to start the hybrid system.
If the system will not start even after multiple attempts at both methods, con-
tact your Toyota dealer.

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4-3. Do-it-yourself maintenance
4
Maintenance and care
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CAUTION
■
Chemicals in the 12 volt battery
A 12 volt battery contains poisonous and corrosive sulfuric acid and may
produce hydrogen gas which is flammable and explosive. To reduce the risk
of death or serious injury, take the following precautions while working on or
near 12 volt battery:
● Do not cause sparks by touching the 12 volt battery terminals with tools.
● Do not smoke or light a match near the 12 volt battery.
● Avoid contact with eyes, skin and clothes.
● Never inhale or swallow electrolyte.
● Wear protective safety glasses when working near the 12 volt battery.
● Keep children away from the 12 volt battery.
■ Where to safety charge the 12 volt battery
Always charge the 12 volt battery in an open area. Do not charge the 12 volt
battery in a garage or closed room where there is not sufficient ventilation.
■ How to recharge the 12 volt battery
Only perform a slow charge (3.5 A or less). The 12 volt battery may explode
if charged at a quicker rate.
■ Emergency measures regarding electrolyte
● If electrolyte gets in your eyes
Flush your eyes with clean water for at least 15 minutes and get immedi-
ate medical attention. If possible, continue to apply water with a sponge or
cloth while traveling to the nearest medical facility.
● If electrolyte gets on your skin
Wash the affected area thoroughly. If you feel pain or a burning sensation,
seek medical attention immediately.
● If electrolyte gets on your clothes
It can soak through clothing on to your skin. Immediately take off the cloth-
ing and follow the procedure above if necessary.
● If you accidentally swallow electrolyte
Drink a large quantity of water or milk. Follow with milk of magnesia,
beaten raw egg or vegetable oil. Get emergency medical attention immedi-
ately.

378 4-3. Do-it-yourself maintenance
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Washer fluidIf any washer does not work, the
washer tank may be empty. Add
washer fluid.
NOTICE
■When recharging th e 12 volt battery
Never recharge the 12 volt battery while the hybrid system is running. Also,
be sure all accessories are turned off.
CAUTION
■ When refilling the washer fluid
Do not refill the washer fluid when the engine is hot or running, as the
washer fluid contains alcohol and may catch fire if spilled on the engine etc.
NOTICE
■Do not use any fluid other than washer fluid
Do not use soapy water or engine antifreeze instead of washer fluid.
Doing so may cause streaking on the vehicle’s painted surfaces.
■ Diluting washer fluid
Dilute washer fluid with water as necessary.
Refer to the freezing temperatures listed on the washer fluid tank.

396
4-3. Do-it-yourself maintenance
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Key batter y
Replace the battery with a new one if it is discharged.
■You will need the following items:
●Small Phillips-hea d screwdriver
● Lithium battery (CR2032)
■ Replacing the battery
Take out the mechanical key.
Remove the cover.
Remove the battery cover
bolts, the battery cover and
depleted battery.
Insert a new battery with the
“+” terminal facing up.
STEP1
STEP2
STEP3

397
4-3. Do-it-yourself maintenance
4
Maintenance and care
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■
If the electronic key battery is discharged
The following symptoms may occur.
● The smart key system and wireless remote control will not function prop-
erly.
● The operational range is reduced.
■ Use a CR2032 lithium battery
● Batteries can be purchased at your Toyota dealer, jewelers, or camera
stores.
● Replace only with the same or equivalent type recommended by a Toy-
ota dealer.
● Dispose of used batteries according to the local laws.
CAUTION
■Removed battery and other parts
Keep away from children.
These parts are small and if swallowed by a child they can cause choking.
NOTICE
■For normal operation after replacing the battery
Observe the following precautions to prevent accidents.
● Always work with dry hands.
Moisture may cause the battery to rust.
● Do not touch or move any other components inside the electronic key.
● Do not bend the battery terminals.

404 4-3. Do-it-yourself maintenance
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*1: Vehicles with halogen headlights (low beam)
*2: Vehicles with discharge headlights (low beam)35 ABS-1 25 A Anti-lock brake system
36 ETCS 10 A Electronic throttle control system
37 BATT FAN 10 A Battery cooling fan
38 HAZ 10 A
Turn signal lights, emergency
flasher
39 DOME 15 A Audio system, interior lights,
Smart key system, gauge and
meter, turn signal lights, luggage
room light, clock
40 ABS MAIN3 15 A Anti-lock brake system
41 ABS MAIN2 10 A Anti-lock brake system
42 ABS MAIN1 10 A Anti-lock brake system
43 FR FOG 15 A Fog lights
44 CHS W/P 10 A CHS W/P
45 AMP 30 A Audio system
46 PTC HTR2 30 A PTC heater
47 PTC HTR1 30 A PTC heater
48 CDS FAN 30 A Electric cooling fan
FuseAmpereCircuit

When trouble arises5
415
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5-1. Essential information .... 416If your vehicle needs to be towed ............................. 416
If you think something is wrong ............................. 423
Event data recorder ......... 424
5-2. Steps to take in an emergency .................... 426
If a warning light turns on or a warning buzzer
sounds... ........................ 426
If you have a flat tire......... 438
If the hybrid system will not start ................................ 448
If you lose your keys ........ 449
If the electronic key does not operate properly....... 450
If the vehicle 12 volt battery is discharged .................. 451
If your vehicle overheats ....................... 456
If the vehicle becomes stuck .............................. 459

430 5-2. Steps to take in an emergency
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*1:This warning light is displayed on the touch screen.
*2:Open door warning buzzer:

(U.S.A.)
Engine oil replacement
reminder light
Illuminates for about 3 sec-
onds and then flasher for
about 15 seconds:
Engine oil is scheduled to
be changed. Check and the engine oil,
and change if necessary.
Comes on and remains:
Engine oil should be
changed. Check and change the
engine oil.

*1
Hybrid battery warning
light
The hybrid battery voltage
drops when the transmis-
sion is left in “N” position. Push the “P” position
switch.
The hybrid battery is dis-
charged. If this light comes on with
the “READY” light on in this
case, have the system
checked by your Toyota
dealer.
High coolant temperature
warning light Indicates high engine cool-
ant temperature P. 456
Master warning light A buzzer sounds and the
warning light comes on
and flashes to indicate that
the master warning system
has detected a malfunc-
tion. Take appropriate action in
accordance with the mes-
sage displayed on the multi-
information display.
Warning lightWarning light/DetailsCorrection procedure

448
5-2. Steps to take in an emergency
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If the hybrid system will not start
If the engine will not start even though correct starting procedures
are being followed (
P. 130), consider each of the following points.
■ The hybrid system will not start even when the starter motor
operates normally.
One of the following may be the cause of the problem.
●The electronic key battery may be discharged. ( P. 450)
● The engine may be flooded.
Try to restart the hybrid system once more following correct
starting procedures. (P. 130)
● There may be a malfunction in the immobilizer system.
( P. 8 1 )
■ 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. 451)
● The 12 volt battery terminal c onnections may be loose or cor-
roded.
■ The interior lights and headlights do not turn on, or the horn
does not sound
One of the following may be the cause of the problem.
●One or both of the 12 volt battery terminals may be discon-
nected.
● The 12 volt battery may be discharged. ( P. 451)
Contact your Toyota dealer if the problem cannot be repaired,
or if repair procedures are unknown.

450
5-2. Steps to take in an emergency
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If the electronic key does not operate properly
Locking and unlocking the doorsUsing the mechanical key in
order to perform the following
operations:Locks all doors
Unlocks the door
Turning the key rearward unlocks
the driver’s door. Turning the key
once again unlocks the other
doors.
Starting the hybrid system
To start the hybrid system, insert
the key into the key slot.
( P. 132)
If the electronic key 12 volt batter y is discharged, the doors can be
opened by the mechanical key. The engine system can be still
started by following the procedure.
21
ITY52P014
ITY52P015
■ Replacing the key battery
As this procedure is the temporary measure, it is recommended that the
electronic key battery be replaced immediately. ( P. 396)