2021 TOYOTA TUNDRA phone

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)

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.

4326-3. Do-it-yourself maintenance
■Situations in which the tire pressure warning system may not oper-
ate properly
●In the following cases, the tire pressure warning system may no t operate
properly.
• If non-genuine Toyota wheels are used.
• A tire has been replaced with a tire that is not an OE (Original Equip-
ment) tire.
• A tire has been replac ed with a tire that is not of the specif ied size.
• Tire chains, etc., are equipped.
• An auxiliary-supported ru n-flat tire is equipped.
• If a window tint that affects the radio wave signals is instal led.
• If there is a lot of snow or ice on the vehicle, particularly around the
wheels or wheel housings.
• If the tire inflation pressure is extremely higher than the sp ecified
level.
• If wheel without the tire pressure warning valve and tranmitter is used.
• If the ID code on the tire pressure warning valves and transmi tter is
not registered in the tire pressure warning computer.
●Performance may be affected in the following situations.
• Near a TV tower, electric power plant, gas station, radio stat ion, large
display, airport or other facilit y that generates strong radio waves or
electrical noise
• When carrying a portable radio, cellular phone, cordless phone or
other wireless communication device
If tire position information is not correctly displayed due to the radio
wave conditions, the display may be corrected by driving and ch anging
the radio wave conditions.
●When the vehicle is parked, the time taken for the warning to s tart or go
off could be extended.
●When tire inflation pressure declines rapidly for example when a tire has
burst, the warning may not function.

603Alphabetical index
Warning light ......................... 486
Warning message ................. 495
Fuel consumption
Average fuel consumption ....................... 117
Current fuel consumption...... 117
Fuel filler door.......................... 250
Fuel pump shut off system ..... 484
Fuses ........................................ 454
Garage door opener ................ 385
Gas station information .......... 612
Gauges ..................................... 105
Glove box ................................. 362
Hands-free system (for cellular phone)
*
Head restraints ........................ 157
Headlights ................................ 234 Automatic High Beam ........... 239
Light switch ........................... 234
Replacing light bulbs............. 459
Wattage ................................ 550
Heaters Automatic air conditioning system ......... ....................... 347
Manual air conditioning system ......... ....................... 340
Outside rear view
mirrors ........................ 342, 349
Seat heaters ......................... 354 High mounted stoplight
Replacing.............................. 470
Wattage ................................ 550
Hood ......................................... 414
Hooks Deck hooks ........................... 377
Retaining hooks (floor mat) .... 30
Horn .......................................... 162
I/M test ...................................... 411
Identification Engine .................................. 541
Tire ....................................... 555
Vehicle .................................. 541
Ignition switch
(engine switch) ...................... 217
Ignition switch light (engine switch light) ............. 357
Illuminated entry system ........ 359
Immobilizer system ................... 85
Indicators ................................. 102
Initialization Maintenance ......................... 407
Moon roof ............................. 181
Tire pressure warning system .... .............. 428
Inside rear view mirror ............ 164
Instrument panel light
control .................................... 107
Interior lights ........................... 357
Personal lights ...................... 358
Switches ............................... 357
Wattage ................................ 550
Intuitive parking assist ........... 298 Function ................................ 298
Warning message......... 494, 495
G
H
I
*: Refer to “NAVIGATION AND MULTIMEDIA SYSTEM OWNER
’S MANUAL”.

609Alphabetical index
Outside rear view mirror defoggers switch ........ 342, 349
Outside rear view mirror
switches.............................. 167
Personal/interior lights main switch......................... 357
Power back window
switch ................................. 176
Power door lock switch ......... 130
Power window switches ........ 172
Seat heater switches ............ 354
Seat ventilator switches ........ 354
Tilt and telescopic steering control switch ........ 162
Tire pressure warning reset
switch ................................. 428
TOW/HAUL switch ................ 228
Turn signal lights................... 232
VSC off switch ......................... 318, 323
Window lock switch............... 172
Windshield wiper de-icer switch ............. 343, 350
Windshield wipers and washer switch .............. 245 Tachometer .............................. 105
Tail lights.................................. 234
Light switch ........................... 234
Replacing light bulbs ............ 468
Wattage ................................ 550
Tailgate Removing the tailgate ........... 134
Tailgate ................................. 133
Talk switch
*
Telephone switches*
Theft deterrent system Alarm ...................................... 95
Engine immobilizer system ..... 85
Tire inflation pressure............. 442 Maintenance data ................. 548
Warning light......................... 487
Tire information ....................... 554 Glossary ............................... 559
Size....................................... 555
Tire identification number ..... 555
Uniform Tire Quality Grading .............................. 557
Tire pressure warning system.................................... 427 Initializing .............................. 428
Installing tire pressure
warning valves and
transmitters ........................ 427
Registering ID codes ............ 429
Tire pressure warning reset
switch ................................. 428
Warning light......................... 487
T
*: Refer to “NAVIGATION AND MULTIMEDIA SYSTEM OWNER
’S MANUAL”.