2021 TOYOTA TUNDRA change key battery

1243-1. Key information
■Key battery depletion (type B or type C)
Type B
If the wireless remote control function does not operate, the b attery may be
depleted. Replace the battery when necessary. ( P. 451)
Type C
● The standard battery life is 1 to 2 years.
● If the battery becomes low, an alarm will sound in the cabin wh en the engine
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 wirel ess remote control does not oper-
ate.
• 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 1 m
(3 ft.) of the following electrical appliances that produce a m agnetic field:
•TVs
• Personal computers
• Cellular phones, cordless phones and battery chargers
• Recharging cellular phones or cordless phones
• Table lamps
• Induction cookers
■Replacing the battery (type B or type C)
P. 451
■ Confirmation of the registered key number
The number of keys already registered to the vehicle can be confirmed. Ask
your Toyota dealer for details.
■ Customization (type B or type C)
Settings (e.g. wireless remote control system) can be changed.
(Customizable features: P. 564)

1253-1. Key information
3
Operation of each component
■Certification for wireless remote control (type B)
For vehicles sold in the U.S.A.
FCC ID: GQ4-52T
FCC ID: GQ4-49R
NOTE:
This device complies with part 15 of the FCC Rules. Operation is subject to
the following two conditions: (1) This device may not cause har mful interfer-
ence, and (2) this device must accept any interference received, including
interference that may cause undesired operation.
FCC WARNING:
Changes or modifications not expressly approved by the party re sponsible for
compliance could void the user’s authority to operate the equip ment.

The FCC ID/IC Certification number is affixed inside the equipment. You can
find the ID/number when replacing the battery.
For vehicles sold in Canada
NOTE:
This device complies with Industry Canada’s license-exempt RSSs . Opera-
tion is subject to the following two conditions: (1) This devic e may not cause
interference; and (2) This device must accept any interference, including
interference that may cause undesired operation of the device.

The FCC ID/IC Certification number is affixed inside the equipment. You can
find the ID/number when replacing the battery.
NOTE:
Le présent appareil est conforme aux CNR d’Industrie Canada app licables
aux appareils radio exempts de licence. L’exploitation est auto risée aux deux
conditions suivantes:(1) l’appareil ne doit pas produire de bro uillage; (2) l’util-
isateur de l’appareil doit accepter tout brouillage radioélectr ique subi, même
si le brouillage est susceptible d’en compromettre le fonctionn ement.

L’identification FCC/Ie numéro d’accréditation IC est apposé(e) à l’intérieur
de l’appareil.
■ Certification for wireless remote control (type C)
P. 145

1423-2. Opening, closing and locking the doors
■Conditions affecting operation
The smart key system uses weak radio waves. In the following si tuations, the
communication between the electronic key and the vehicle may be affected,
preventing the smart key system, wireless remote control and en gine immobi-
lizer system from operating properly. (Ways of coping: P. 523)
● When the electronic 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, cordless phone or other
wireless communication device
● When the electronic key is in contact with, or is covered by th e following
metallic objects
• Cards to which aluminum foil is attached
• Cigarette boxes that have aluminum foil inside
• Metallic wallets or bags
• Coins
• Hand warmers made of metal
• Media such as CDs and DVDs
● When multiple electronic keys are in the vicinity
● When other wireless keys (that emit radio waves) are being used nearby
● When carrying the electronic key together with the following devices that
emit radio waves
• Another vehicle’s electronic key or a wireless key that emits radio waves
• Personal computers or personal digital assistants (PDAs)
• Digital audio players
• Portable game systems
● If window tint with a metallic content or metallic objects are attached to the
back window
● When the electronic key is placed near a battery charger or ele ctronic
devices
■ Note for the entry function
●Even when the electronic key is within the effective range (detection 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 or floor, or in the console
box or glove box when the engine is started or engine switch mo des are
changed.

2384-3. Operating the lights and wipers
■Automatic light off system
●When the headlights come on: The headlights and tail lights tur n off 30 sec-
onds after a door is opened and closed if the engine switch is turned to ACC
or OFF. (The lights turn off immediately if the button on the key is
pressed after all the doors are locked.)
● When only the tail lights come on: The tail lights turn off aut omatically if the
engine switch is tuned to ACC or OFF and the driver’s door is o pened.
Vehicles with automatic headlight system: If any of the doors i s kept open, the
lights automatically turn off after 20 minutes.
To turn the lights on again, turn the engine switch to ON, or turn the light
switch off once and then back to or .
■ Light reminder buzzer
A buzzer sounds when the key is removed from the engine switch and the
driver’s door is opened while the lights are turned on.
■ Customization that can be configured at Toyota dealer
Settings (automatic light off system) can be changed.
(Customizable features: P. 564)
NOTICE
■To prevent battery discharge
Do not leave the lights on longer than necessary when the engin e is not
running.

3595-2. Using the interior lights
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Interior features
“OFF”
The cargo lamp can be individually
turned on or off.
“DOOR”
The cargo lamp comes on when a
door is opened. They turn off when
the doors are closed.
“ON”
The cargo lamp cannot be individually turned off.
■Illuminated entry system
Vehicles without a smart key system
The lights automatically turn on/off according to the engine sw itch position,
whether the doors are locked/unlocked, and whether the doors are opened/
closed.
Vehicles with a smart key system
The lights automatically turn on/off according to engine switch mode, the
presence of the electronic key, whether the doors are locked/un locked, and
whether the doors are opened/closed.
■ To prevent battery discharge
If the following lights remain on when the door is not fully closed and the main
switch is in the “DOOR” position, the lights will go off automatically after 20
minutes:
●Personal lights
● Interior lights
● Cargo lamp
■ Customization that can be configured at Toyota dealer
Settings (e.g. the time elapsed before lights turn off) can be changed.
(Customizable features: P. 564)
Cargo lamp main switch
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2
3

5247-2. Steps to take in an emergency
■Stopping the engine
Shift the shift lever to P and press the engine switch as you normally do when
stopping the engine.
■ 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 engine switch modes
Within 10 seconds of the buzzer sounding, release the brake ped al and press
the engine switch.
The engine does not start and modes will be changed each time t he switch is
pressed. ( P. 220)