change key battery TOYOTA PRIUS C 2020 Owners Manual

1233-1. Key information
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Operation of each component
PRIUS c_U■
Key battery depletion
Vehicles without a smart key system
If the wireless remote control function does not operate, the b attery may be
depleted. Replace the battery when necessary. ( P. 451)
Vehicles with a smart key system
● The standard battery life is 1 to 2 years.
● If the battery becomes low, an alarm will sound in the cabin wh en the hybrid
system stops. ( P. 503)
● As the electronic key always receives radio waves, the battery will become
depleted even if the electronic key is not used. The following symptoms indi-
cate that the electronic key battery may be depleted. Replace the battery
when necessary. ( P. 451)
• The smart key system or the wireless remote control does not o perate.
• 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 magnet ic field:
•TVs
• Personal computers
• Cellular phones, cordless phones and battery chargers
• Recharging cellular phones or cordless phones
• Induction cookers
• Table lamps
■ Replacing the battery
P. 451
■ Confirmation of the registered key number (vehicles with a smar t key
system)
The number of keys already registered to the vehicle can be confirmed. Ask
your Toyota dealer for details.
■ If a wrong key is used (vehicles with a smart key system)
The key cylinder rotates freely to isolate inside mechanism.
■ Customization that can be configured at Toyota dealer
Settings (e.g. wireless remote control system) can be changed.
(Customizable features: P. 560)

1343-2. Opening, closing and locking the doors
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■Switching the door unlock func tion (vehicles with a smart key system)
It is possible to set which doors the entry function unlocks using the wireless
remote control.
Turn the power switch off.
When the indicator light on the key surface is not on, press an d hold
or for about 5 seconds while pressing and holding .
The setting changes each time an operation is performed, as sho wn below.
(When changing the setting continuously, release the buttons, w ait for at least
5 seconds, and repeat step 2.)
■ Conditions affecting the operation of the smart key system or w ireless
remote control
Vehicles without a smart key system
The wireless remote control function may not operate normally i n the follow-
ing situations:
● When the wireless key battery is depleted
● Near a TV tower, electric power plant, gas station, radio stati on, large dis-
play, airport or other facility that generates strong radio wav es or electrical
noise
● When carrying a portable radio, cellular phone or other wireles s communi-
cation device
● When the wireless key is in contact with, or is covered by a me tallic object
● When other wireless keys (that emits radio waves) are being use d nearby
● If window tint with a metallic content or metallic objects are attached to the
rear window
Vehicles with a smart key system
P. 143
■ Customization that can be configured at Toyota dealer
Settings (e.g. unlocking function using a key) can be changed.
(Customizable features: P. 560)
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Unlocking doorsBeep
Holding the driver's door handle
unlocks only the driver's door.
Exterior: Beeps 3 times
Interior: Beeps once
Holding the front passenger’s door
handle unlocks all the doors.
Holding either front door handle
unlocks all the doors.Exterior: Beeps twice
Interior: Beeps once

1443-2. Opening, closing and locking the doors
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Notes for the entry function
●Even when the electronic key is within the effective range (det ection areas),
the system may not operate properly in the following cases:
• The electronic key is too close to the window or outside door handle, near
the ground, or in a high place when the doors are locked or unl ocked.
• The electronic key is on the instrument panel, luggage cover o r floor, in
the door pockets or glove box when the hybrid system is started or power
switch modes are changed.
● Do not exit the vehicle with the electronic key placed on the i nstrument
panel or near the door pockets. Depending on the radio wave reception con-
ditions, it may be detected by the antenna outside the cabin and the door
will become lockable from the outside, possibly trapping the electronic key
inside the vehicle.
● As long as the electronic key is within the effective range, th e doors may be
locked or unlocked by anyone. However, only the doors detecting the elec-
tronic key can be used to unlock the vehicle.
● Whether or not the electronic key is inside the vehicle, the hy brid system
could be started if the electronic key is near the window.
● The doors may unlock if a large amount of water splashes on the door han-
dle, such as in the rain or in a car wash when the electronic k ey is within the
effective range. (The door will automatically be locked after a pproximately
60 seconds if the doors are not opened and closed.)
● The lock and unlock sensors may not work properly if they come into con-
tact with ice, snow, mud, etc. Clean the sensors and attempt to operate
them again.
● If the wireless remote control is used to lock the doors when t he electronic
key is near the vehicle, there is a possibility that the door m ay not be
unlocked by the entry function. (Using the wireless remote cont rol to unlock
the doors may resume the function.)
● If the door handle becomes wet while the electronic key is with in the effec-
tive range, the door may lock and unlock repeatedly. In that ca se, follow the
following correction procedures to wash the vehicle:
• Place the electronic key in a location 6 ft. (2 m) or more awa y from the
vehicle. (Take care to ensure that the key is not stolen.)
• Set the electronic key to battery-saving mode to disable the s mart key
system. ( P. 142)

1964-2. Driving procedures
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If the “READY” indicator does not come on
In the event that the “READY” indicator does not come on even a fter perform-
ing the proper procedures for starting the vehicle, contact you r Toyota dealer
immediately.
■ If the hybrid system is malfunctioning
P. 489
■ If the electronic key battery is depleted
P. 451
■ Operation of the power switch
●If the switch is not pressed shortly and firmly, the power switch mode may
not change or the hybrid system may not start.
● If attempting to restart the hybrid system immediately after tu rning the power
switch off, the hybrid system may not start in some cases. After turning the
power switch off, please wait a few seconds before restarting t he hybrid sys-
tem.
■ If the smart key system has been d eactivated in a customized setting
P. 520

2114-3. Operating the lights and wipers
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Driving
PRIUS c_U
Vehicles with a smart key system
● When the headlights are on: The headlights and tail lights turn off 30 sec-
onds after the power switch is turned to ACCESSORY mode or turn ed off
and a door is opened and closed. (The lights turn off immediate ly if on
the key is pressed after all the doors are locked.)
● When only the tail lights are on: The tail lights turn off automatically if the
power switch is turned to ACCESSORY mode or turned off and the driver’s
door is opened.
To turn the lights on again, turn the power switch to ON mode, or turn the light
switch off once and then back to or .
If any of the doors or trunk lid is kept open, the lights automatically turn off
after 20 minutes.
■ Light reminder buzzer
Vehicles without a smart key system
A buzzer sounds when the power switch is turned to the “LOCK” o r “ACC”
position and the driver's door is opened while the lights are t urned on.
Vehicles with a smart key system
A buzzer sounds when the power switch is turned off or turned t o ACCES-
SORY mode and the driver's door is opened while the lights are turned on.
■ 12-volt battery-saving function
In the following conditions, the remaining lights will go off automatically after
20 minutes in order to prevent the vehicle battery from being d ischarged:
● The headlights and/or tail lights are on.
● The power switch is turned to the “ACC” or “LOCK” position (veh icles with-
out a smart key system) or the power switch is turned to ACCESSORY
mode or turned off (vehicles with a smart key system).
This function will be canceled in any of the following situatio ns:
● When the power switch is turned to the “ON” position (vehicles without a
smart key system) or the power switch is turned to ON mode (veh icles with
a smart key system).
● When the light switch is operated.
● When the door is opened or closed.
■ Customization that can be configured at Toyota dealer
Setting (e.g. daytime running light system) can be changed.
(Customizable features: P. 560)
NOTICE
■To prevent 12-volt b attery discharge
Do not leave the lights on longer than necessary when the hybri d system is
off.

3876-2. Using the interior lights
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Interior features
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■Illuminated entry system
Vehicles without a smart key system
When the interior lights switch is in the door position, the interior lights auto-
matically turn on/off according to the power switch position, whether the
doors are locked/unlocked, and whether the doors are open/close d.
Vehicles with a smart key system
When the interior lights switch is in the door position, the interior lights auto-
matically turn on/off according to power switch mode, the presence of the
electronic key, whether the doors are locked/unlocked, and whet her the doors
are open/closed.
■ To prevent 12-volt battery discharge
Vehicles without a smart key system
If the interior lights, personal lights or luggage compartment light remain on
when the power switch is “LOCK” position, the lights will go of f automatically
after 20 minutes.
Vehicles with a smart key system
If the interior lights, personal lights or luggage compartment light remain on
when the power switch is off, the lights will go off automatica lly after 20 min-
utes.
■ Customization that can be configured at Toyota dealer
Settings (e.g. the time elapsed before lights turn off) can be changed.
(Customizable features: P. 560)
NOTICE
■To prevent 12-volt b attery discharge
Do not leave the lights on longer than necessary when the hybri d system is
off.

5218-2. Steps to take in an emergency
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When trouble arises
PRIUS c_U
Firmly depress the brake pedal and check that is displayed
on the multi-information display.
Press the power switc h shortly and firmly.
In the event that the power s witch still cannot be operated, co ntact
your Toyota 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 recommende d that the
electronic key battery be replaced immediately when the battery is depleted.
( P. 451)
■ Changing power switch modes
Release the brake pedal and press the power switch in above.
The hybrid system does not start and modes will be changed each time the
switch is pressed. ( P. 193)
■ If the doors cannot be locked o r unlocked by the smart key syst em
Lock and unlock the doors by the mechanical key or wireless rem ote control.
■ When the electronic key does not work properly
●Make sure that the smart key system has not been deactivated in the cus-
tomization setting. If it is off, turn the function on.
(Customizable features: P. 560)
● Check if battery-saving mode is set. If it is set, cancel the f unction.
( P. 142)
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