2016 TOYOTA AVALON HYBRID battery

3366-2. Maintenance
AVALON_HV_U (01999-07002)
The OBD system determines that a problem exists somewhere in the
emission control system. Your vehicle may not pass the I/M test and
may need to be repaired. Contact your Toyota dealer to service the
vehicle.
● When the 12-volt battery is disconnected or discharged
Readiness codes that are set duri ng ordinary driving are erased.
Also, depending on your driving habits, the readiness codes may
not be completely set.
● When the fuel tank cap is loose
The malfunction indicator lamp comes on indicating a temporary
malfunction and your vehicle may not pass the I/M test.
The error code in the OBD system will not be cleared unless the vehi-
cle is driven 40 or more times.
Contact your Toyota dealer to prepare the vehicle for re-testing.
Emission inspection an d maintenance (I/M)
programs
Some states have vehicle emission inspection programs which
include OBD (On Board Diagnos tics) checks. The OBD system
monitors the operation of the emission control system.
If the malfunction indicator lamp comes on
Your vehicle may not pass the I/M test in the following situations:
When the malfunction indicator lamp still remains on after sev-
eral driving trips
If your vehicle does not pass the I/M test

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6
Maintenance and care
AVALON_HV_U (01999-07002)
6-3. Do-it-yourself maintenance
Do-it-yourself ser vice precautions
If you perform maintenance by yourself, be sure to follow the
correct procedure as given in these sections.
ItemsParts and tools
12-volt battery condi-
tion (P. 350)• Grease
• Conventional wrench
(for terminal clamp bolts)
Brake fluid level (P. 348)
• FMVSS No.116 DOT 3 or SAE J1703 brake
fluid
• Rag or paper towel
• Funnel (used only for adding brake fluid)
Engine/power control
unit coolant level (P. 345)
• “Toyota Super Long Life Coolant” or a similar
high quality ethylene glycol-based non-silicate,
non-amine, non-nitrite and non-borate coolant
with long-life hybrid organic acid technology.
“Toyota Super Long Life Coolant” is pre-mixed
with 50% coolant and 50% deionized water.
• Funnel (used only for adding coolant)
Engine oil level
(P. 342)• “Toyota Genuine Motor Oil” or equivalent
• Rag or paper towel
• Funnel (used only for adding engine oil)
Fuses ( P. 374)• Fuse with same amperage rating as original
Light bulbs (P. 377)
• Bulb with same number and wattage rating as
original
• Phillips-head screwdriver
• Flathead screwdriver
• Wrench
Radiator and con-
denser ( P. 347)
Tire inflation pressure
( P. 364)• Tire pressure gauge
• Compressed air source
Washer fluid
(P. 349)
• Water or washer fluid containing antifreeze (for
winter use)
• Funnel (used only for adding water or washer fluid)

3416-3. Do-it-yourself maintenance
6
Maintenance and care
AVALON_HV_U (01999-07002)
■12-volt battery
P. 350
Engine compartment
Fuse boxes ( P. 374)
Engine oil filler cap ( P. 343)
Engine oil level dipstick ( P. 342)
Brake fluid reservoir ( P. 348)
Engine coolant radiator ( P. 347) Power control unit coolant
radiator
( P. 347)
Condenser ( P. 347)
Electric cooling fans
Engine coolant reservoir ( P. 345)
Washer fluid tank ( P. 349)
Power control unit coolant res-
ervoir ( P. 345)1
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3506-3. Do-it-yourself maintenance
AVALON_HV_U (01999-07002)
The 12-volt battery is located on
the right-hand side of luggage
compartment.
Pull the 12-volt battery cover while
pressing down on the tab.
Make sure that the 12-volt battery terminals are not corroded and that
there are no loose connections, cracks, or loose clamps.
Terminals
Hold-down clamp
12-volt batter y
Location
Removing the 12-volt battery cover
Exterior
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3516-3. Do-it-yourself maintenance
6
Maintenance and care
AVALON_HV_U (01999-07002)
■Before recharging
When recharging, the 12-volt battery produces hydrogen gas which is flam-
mable and explosive. Therefore, observe the following precautions before
recharging:
●If recharging with the 12-volt battery installed on the vehicle, be sure to dis-
connect the ground cable.
● Make sure the power switch on the charger is off when connecting and dis-
connecting the charger cables to the 12-volt battery.
■ After recharging/reconnecting the 12-volt battery
●The hybrid system may not start. Follow the procedure below to initialize the
system.
Shift the shift lever to P.
Open and close any of the doors.
Restart the hybrid system.
● Unlocking the doors using the smart key system may not be possible imme-
diately after reconnecting the 12-volt battery. If this happens, use the wire-
less remote control or the mechanical key to lock/unlock the doors.
● Start the hybrid system with the power switch in ACCESSORY mode. The
hybrid system may not start when the power switch turned from off. How-
ever, the hybrid system will operat e normally from the second attempt.
● The power switch mode is recorded by the vehicle. If the 12-volt battery is
reconnected, the vehicle will return the power switch mode to the status it
was in before the 12-volt battery was disconnected. Make sure to turn off
the power switch before disconnect the 12-volt battery. Take extra care
when connecting the 12-volt battery if the power switch mode prior to dis-
charge is unknown.
If the system will not start even after multiple attempts at all methods above,
contact your Toyota dealer.
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3526-3. Do-it-yourself maintenance
AVALON_HV_U (01999-07002)
WARNING
■Chemicals in the 12-volt battery
The 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 the 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 safely 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 insufficient ventila-
tion.
■ How to recharge th e 12-volt battery
Only perform a slow charge (5 A or less). The 12-volt battery may explode if
charged at a quicker rate.

3536-3. Do-it-yourself maintenance
6
Maintenance and care
AVALON_HV_U (01999-07002)
WARNING
■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 burning, get 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. Get emergency medical attention
immediately.
■ When replacing the 12-volt battery
Use a 12-volt battery designed for this vehicle. Failure to do so may cause
gas (hydrogen) to enter the passenger compartment, causing a fire or
explosion.
For replacement of the 12-volt battery, contact your Toyota dealer.
NOTICE
■When recharging the 12-volt battery
Never recharge the 12-volt battery while the hybrid system is operating.
Also, be sure all accessories are turned off.

3726-3. Do-it-yourself maintenance
AVALON_HV_U (01999-07002)
●Flathead screwdriver
● Small flathead screwdriver
● Lithium battery CR2032
Take out the mechanical key.
Remove the cover.
To prevent damage to the key,
cover the tip of the screwdriver with
a rag.
Remove the depleted battery.
Insert a new battery with the “+”
terminal facing up.
Electronic key batter y
Replace the battery with a new one if it is depleted.
You will need the following items:
Replacing the battery
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