2012 Lexus CT200h Battery

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4-3. Do-it-yourself maintenance
CT200h_OM_OM76067E_(EE)
Engine compartment
12-volt battery
P. 5 0 8
Engine coolant reservoir
(P. 503)
Engine oil level dipstick
(P. 498)
Engine oil filler cap (P.
498)
Power control unit coolantFuse box (P. 532)
Radiator (P. 506)
Condenser (P. 506)
Electric cooling fans
Washer fluid tank (P.
507)

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4-3. Do-it-yourself maintenance
CT200h_OM_OM76067E_(EE)
12-volt battery
Location
The 12-volt battery is located
in the right-hand side of lug-
gage compartment.
Removing the 12-volt battery cover
Open the center and right side auxiliary boxes. (P. 470)
Remove the center auxiliary box. (P. 600)
Remove the right side auxil-
iary box.
Remove the 12-volt battery
maintenance cover.
STEP1
STEP2
STEP3
STEP4

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Maintenance and care
CT200h_OM_OM76067E_(EE)
Exterior
Make sure that the 12-volt battery terminals are not corroded
and that there are no loose connections, cracks, or loose
clamps.
Te r m i n a l s
Hold-down clamp
Caution symbols
The meanings of each caution symbol on the top of the 12-
volt battery are as follows:
No smoking, no naked
flames, no sparks
Shield eyes
Keep away from childrenBattery acid
Note operating instruc-
Explosive gas

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CT200h_OM_OM76067E_(EE)
Installing the 12-volt battery maintenance cover
Insert the 2 tabs on the far
side of the cover into the
holes.
Hook on the 2 tabs on the
near side of the cover.
Hook on the 2 tabs on the
upper side of the cover.
STEP1
STEP2
STEP3

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Maintenance and care
CT200h_OM_OM76067E_(EE)
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
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
Unlocking the doors using the smart entry & start system may not be
possible immediately after reconnecting the 12-volt battery. If this hap-
pens, use the wireless 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 with the “POWER” switch
turned OFF. However, the hybrid system will operate normally from the
second attempt.
The “POWER” switch mode is recorded by the vehicle. If the battery is
reconnected, the vehicle will return the “POWER” switch mode to the
status it was in before the battery was disconnected. Make sure to turn
off the power before disconnect the battery. Take extra care when con-
necting the battery if the “POWER” switch mode prior to discharge is
unknown.
Restart the hybrid system, depress the brake pedal, and confirm that it is
possible to shift into each shift position.
If the system will not start even after multiple attempts at all methods above,
contact any authorized Lexus dealer or repairer, or another duly qualified
and equipped professional.

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CAUTION
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 ventilation.
How to recharge the 12-volt battery
Only perform a slow charge
*. The 12-volt battery may explode if charged at
a quicker rate.
*: 4.2 A or less on vehicles with a navigation system or alarm
3.5 A or less on vehicles without a navigation system and alarm

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Maintenance and care
CT200h_OM_OM76067E_(EE)
CAUTION
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
clothing 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 explo-
sion.
For replacement of the 12-volt battery, contact any authorized Lexus dealer
or repairer, or another duly qualified and equipped professional.

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CAUTION
When disconnecting the 12-volt battery
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.
Do not disconnect the negative (-) termi-
nal on the body side as shown. The dis-
connected negative (-) terminal may
touch the positive (+) terminal, which
may cause a short and result in death or
serious injury.