2016 Lexus ES300h replacing battery

TABLE OF CONTENTS6
ES300h_OM_OM33B71U_(U)
7-1. Maintenance and careCleaning and protecting the vehicle exterior ................ 428
Cleaning and protecting the vehicle inte rior....................431
7-2. Maintenance Maintenance requirements ............................ 434
General maintenance...............437
Emission inspection and maintenance (I/M)
programs .................................... 440
7-3. Do-it-yourself maintenance Do-it-yourself service precautions..................................441
Hood ............................................... 443
Positioning a floor jack............. 444
Engine compartment ............... 445
12-volt battery ............................. 455
Tires.................................................. 459
Tire inflation pressure ............... 468
Wheels ............................................. 471
Air conditioning filter ................473
Electronic key battery...............475
Checking and replacing fuses............................................... 477
Light bulbs ....................................480 8-1. Essential information
Emergency flashers .................. 492
If your vehicle has to be stopped in an emergency.... 493
8-2. Steps to take in an emergency If your vehicle needs to be towed................................ 494
If you think something is wrong ................ 498
If a warning light turns on or a warning buzzer sounds..... 499
If a warning message is displayed ................................505
If you have a flat tire ..................508
If the hybrid system will not start ................................................ 518
If the shift lever cannot be shifted from P ..................... 520
If the electronic key does not operate properly ....................... 521
If the 12-volt battery is discharged ................................. 523
If your vehicle overheats ..........527
If the vehicle becomes stuck ...............................................531
7Maintenance and care8When trouble arises

791-3. Theft deterrent system
ES300h_OM_OM33B71U_(U)
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For safety and security
■System maintenance
The vehicle has a maintenance-free type alarm system.
■Items to check before locking the vehicle
To prevent unexpected triggering of the alarm and vehicle theft, make sure of the follow-
ing:
●Nobody is in the vehicle.
●The windows and moon roof are closed before the alarm is set.
●No valuables or other personal items are left in the vehicle.
■Triggering of the alarm
The alarm may be triggered in the following situations:
(Stopping the alarm deactivates the alarm system.)
■Alarm-operated door lock
In the following cases, the door may automatically lock:
●When a person remaining in the vehicle unlocks the door and the alarm is activated.
●While the alarm is activated, a person re maining in the vehicle unlocks the door.
●When recharging or replacing the 12-volt battery.
●A person inside the vehicle opens a door, the
trunk or hood, or unlocks the vehicle using an
inside lock button.
●The 12-volt battery is recharged or replaced
when the vehicle is locked. (P. 5 2 5 )
NOTICE
■To ensure the system operates correctly
Do not modify or remove the system. If modified or removed, the proper operation of
the system cannot be guaranteed.

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ES300h_OM_OM33B71U_(U)3-1. Key information
■Electronic key battery depletion
●The standard battery life is 1 to 2 years.
●If the battery becomes low, an alarm will
sound in the cabin when the hybrid system
stops. ( P. 4 7 5 )
●As the electronic key always receives ra dio waves, the battery will become depleted
even if the electronic key is not used. The following symptoms indicate that the elec-
tronic key battery may be depleted. Re place the battery when necessary. (P. 4 7 5 )
• The smart access system with push-button start or the wireless remote control does
not operate.
• The detection area becomes smaller.
• The LED indicator on the key surface does not turn on.
●To avoid serious deterioration, do not leave the electronic key within 3 ft. (1 m) of the
following electrical appliances that produce a magnetic field:
•TVs
• Personal computers
• Cellular phones, cordless phones and battery chargers
• Recharging cellular phones or cordless phones
• Table lamps
• Induction cookers
■If “Key Battery Low” is displaye d on the multi-information display
The electronic key has a low battery. Replace the electronic key battery. ( P. 4 7 5 )
■Replacing the battery
P. 4 7 5
■Confirmation of the registered key number
The number of keys already registered to the vehicle can be confirmed. Ask your Lexus
dealer for details.
■If a wrong key is used
The key cylinder rotates freely to isolate inside mechanism.

427
ES300h_OM_OM33B71U_(U)
7Maintenance and care
7-1. Maintenance and careCleaning and protecting the vehicle exterior................. 428
Cleaning and protecting the vehicle interior ................... 431
7-2. Maintenance Maintenance requirements............................. 434
General maintena nce .............. 437
Emission inspection and maintenance (I/M)
programs .................................... 440
7-3. Do-it-yourself maintenance Do-it-yourself service precautions ..................................441
Hood ............................................... 443
Positioning a floor jack ............. 444
Engine compartment ............... 445
12-volt battery.............................. 455
Tires .................................................. 459
Tire inflation pressure ...............468
Wheels ............................................. 471
Air conditioning filter ................473
Electronic key battery .............. 475
Checking and replacing fuses ...............................................477
Light bulbs.................................... 480

ES300h_OM_OM33B71U_(U)
4577-3. Do-it-yourself maintenance
7
Maintenance and care
WA R N I N G
■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 (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 immediate 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 fe el 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 fol-
low the procedure above if necessary.
●If you accidentally swallow electrolyte
Drink a large quantity of water or milk. Get emergency medical attention immedi-
ately.
■When replacing the 12-volt battery
Use a 12-volt battery designed for this vehicle. Failure to do so may cause gas (hydro-
gen) to enter the passenger compartment, causing a fire or explosion.
For replacement of the 12-volt battery, contact your Lexus dealer.

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ES300h_OM_OM33B71U_(U)7-3. Do-it-yourself maintenance
7
Maintenance and care
Electronic key battery
●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 “+” termi-
nal facing up.
Replace the battery with a new one if it is depleted.
You will need the following items:
Replacing the battery
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476
ES300h_OM_OM33B71U_(U)7-3. Do-it-yourself maintenance
■Use a CR2032 lithium battery
●Batteries can be purchased at your Lexus
dealer, local electrical appliance shops or
camera stores.
●Replace only with the same or equivalent type recommended by the manufacturer.
●Dispose of used batteries according to local laws.
■If the electronic key battery is depleted
The following symptoms may occur:
●The smart access system with push-button start and wireless remote control will not
function properly.
●The operational range will be reduced.
WA R N I N G
■Removed battery and other parts
These parts are small and if swallowed by a child, they can cause choking. Keep away
from children. Failure to do so could result in death or serious injury.
NOTICE
■For normal operation afte r 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 component inside the remote control.
●Do not bend either of the battery terminals.

5228-2. Steps to take in an emergency
ES300h_OM_OM33B71U_(U)
Ensure that the shift lever is in P and depress the brake pedal.
Touch the Lexus emblem side of the
electronic key to the power switch.
The power switch will turn to ON mode.
When the smart access system with
push-button start is deactivated in cus-
tomization setting, the power switch will
turn to ACCESSORY mode.
Firmly depress the brake pedal and check that is shown on the multi-
information display.
Press the power switch.
In the event that the hybrid system still cannot be started, contact your Lexus
dealer.
■Stopping the hybrid system
Shift the shift lever to P and press the power switch as you normally do when stopping the
hybrid system.
■Replacing the key battery
As the above procedure is a temporary measure, it is recommended that the electronic
key battery be replaced immediatel y when the battery is depleted. (P. 4 7 5 )
■Changing power switch modes
Release the brake pedal and press the power switch in step above.
The hybrid system does not start and mode s will be changed each time the switch is
pressed. ( P. 1 6 7 )
■When the electronic key does not work properly
●Make sure that the smart access system wi th push-button start has not been deacti-
vated in the custom ization setting. If it is off, turn the function on.
(Customizable features P. 5 5 5 )
●Check if battery-saving mo de is set. If it is set, cancel the function. ( P. 122)
Starting the hybrid system
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2
WA R N I N G
■When using the mechanical key and operating the power windows or moon roof
Operate the power window or moon roof afte r checking to make sure that there is no
possibility of any passenger having any of their body parts caught in the window or
moon roof.
Also, do not allow children to operate the mech anical key. It is possible for children and
other passengers to get caught in the power window or moon roof.
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