2021 TOYOTA TUNDRA key

5277-2. Steps to take in an emergency
7
When trouble arises
■When recharging or replacing the battery
●Vehicles with a smart key system: In some cases, it may not be possible to
unlock the doors using the smart key system when the battery is dis-
charged. Use the wireless remote control or the mechanical key to lock or
unlock the doors.
● The engine may not start on the first attempt after the battery has recharged
but will start normally after the second attempt. This is not a malfunction.
● Vehicles with a smart key system: The engine switch mode is mem orized by
the vehicle. When the battery is reconnected, the system will r eturn to the
mode it was in before the battery was discharged. Before discon necting the
battery, turn the engine switch off.
If you are unsure what mode the engine switch was in before the battery dis-
charged, be especially careful when reconnecting the battery.
WARNING
■ Avoiding battery fires or explosions
Observe the following precautions to prevent accidentally ignit ing the flam-
mable gas that may be emitted from the battery:
● Make sure each jumper cable is connected to the correct terminal and that
it is not unintentionally in contact with any other than the in tended terminal.
● Do not allow the + and - clamps of the jumper cables to come into contact
with each other.
● Do not smoke, use matches, cigarette lighters or allow open fla me near
the battery.
■ Battery precautions
The battery contains poisonous and corrosive acidic electrolyte , while
related parts contain lead and lead compounds. Observe the foll owing pre-
cautions when handling the battery:
● When working with the battery, always wear safety glasses and t ake care
not to allow any battery fluids (acid) to come into contact wit h skin, clothing
or the vehicle body.
● Do not lean over the battery.
● In the event that battery fluid comes into contact with the skin or eyes,
immediately wash the affected area with water and seek medical attention.
Place a wet sponge or cloth over the affected area until medica l attention
can be received.
● Always wash your hands after handling the battery support, term inals, and
other battery-related parts.
● Do not allow children near the battery.

5688-2. Customization
■Trailer brake controller* ( P. 327)
*: If equipped
■
Door lock* (  P. 127)
*: If equipped
FunctionDefault settingCustomized
setting
TBC trailer type Electric
0-4999lb Electric
5000+ lbO—O
E-O-H
0-4999lb
E-O-H
5000+ lb
TBC OFF
123
FunctionDefault settingCustomized setting
Unlocking using a key Driver’s door
unlocked in one step, all doors
unlocked in two
steps All doors
unlocked in one step—— O
Speed-detecting auto-
matic door lock function On Off—O O
Shifting gears to position
other than P locks all
doors Off On
—O O
Shifting gears to P
unlocks all doors
On Off—O O
Opening the driver’s door
unlocks all doors Off On—O O
123

5698-2. Customization
8
Vehicle specifications
■Smart key system and wireless remote control* ( P. 1 2 7 )
*: If equipped
■
Smart key system* (  P. 127, 138)
*: If equipped
FunctionDefault settingCustomized
setting
Operation signal
(Emergency flashers) On Off — O O
Operation signal
(Buzzer) On Off — — O
Operation buzzer volume Level 5 Off to level 7 O O O
Time elapsed before auto-
matic door lock function is
activated if door is not
opened after being
unlocked 60 seconds
Off
—O O
30 seconds
120 seconds
Open door warning
buzzerOnOff — —O
123
FunctionDefault settingCustomized setting
Smart key systemOnOff——O
Number of permissible
times of continuous smart
lock Twice Unlimited — — O
123

5718-2. Customization
8
Vehicle specifications
■Moon roof* ( P. 1 7 9 )
*: If equipped
■
Automatic light off system* (  P. 234)
*: If equipped
FunctionDefault settingCustomized
setting
Door key linked operation Open and close Open only—— OClose only
Off
Linked operation of com-
ponents when door key is
used Slide only Tilt only
—— O
123
FunctionDefault settingCustomized
setting
Light sensor sensitivity Level 3 Level 1 to 5—O O
Time elapsed before
headlights automatically
turn off after doors are
closed 30 seconds0 seconds
—O O60 seconds
90 seconds
123

5728-2. Customization
■Illumination (P. 3 5 7 )
*: Vehicles with a smart key system
■
Seat Belt Reminder Buzzer ( P. 486)
FunctionDefault settingCustomized
setting
Time elapsed before lights
turn off 15 seconds7.5 seconds—O O30 seconds
Operation after the engine
is off On
Off
—— O
Operation when the doors
are unlocked On Off—— O
Operation when you
approach the vehicle with
the electronic key on your
person
*
On
Off — — O
123
FunctionDefault settingCustomized
setting
Vehicle speed linked seat
belt reminder buzzerOnOff—— O
123

594What to do if... (Troubleshooting)
What to do if... (Troubleshooting)
●If you lose your keys or mechanical keys, new genuine mechanical keys
can be made by your Toyota dealer. ( P. 123)
●If you lose your keys or electronic keys, the risk of vehicle t heft increases
significantly. Contact your Toyota dealer immediately. ( P. 126)
●Is the wireless key battery weak or depleted? (P. 451)
●Vehicles with a smart key system:
Is the engine switch in ON?
When locking the doors, turn the engine switch off. ( P. 220)
●Vehicles with a smart key system:
Is the electronic key left inside the vehicle?
When locking the doors, make sure that you have the electronic key on
your person.
●The function may not operate properly due to the condition of t he radio
wave. ( P. 123)
●Is the child-protector lock set?
The rear door cannot be opened from inside the vehicle when the lock is
set. Open the rear door from outside and then unlock the child-protector
lock. ( P. 131)
If you have a problem, check the following before contacting
your Toyota dealer.
The doors cannot be locked, unlocked, opened or closed
You lose your keys
The doors cannot be locked or unlocked
The rear door cannot be opened

595What to do if... (Troubleshooting)
●Is the shift lever in P? (P. 217)
●Is the battery discharged? ( P. 525)
●Did you press the engine switch while firmly depressing the bra ke pedal?
( P. 219)
●Is the shift lever in P? ( P. 222)
●Is the electronic key anywhere detectable inside the vehicle? ( P. 139)
●Is the steering wheel unlocked? (P. 222)
●Is the electronic key battery weak or depleted?
In this case, the engine can be started in a temporary way. ( P. 523)
●Is the battery discharged? (P. 525)
●Is the engine switch in ON?
If you cannot release the shift lever by depressing the brake p edal with the
engine switch in ON. ( P. 229)
If you think something is wrong
The engine does not start
(vehicles without a smart key system)
The engine does not start
(vehicles with a smart key system)
The shift lever cannot be shifted from P even if you depress
the brake pedal

596What to do if... (Troubleshooting)
●Vehicles without a smart key system:
It is locked to prevent theft of the vehicle if the key is removed from the
engine switch. ( P. 218)
●Vehicles with a smart key system:
It is locked automatically to prevent theft of the vehicle. ( P. 222)
●Is the window lock switch pressed?
The power window except for the one at the driver’s seat cannot be oper-
ated if the window lock switch is pressed. ( P. 172)
●The auto power off function will be operated if the vehicle is left in ACC or
ON (the engine is not running) for a period of time. ( P. 221)
●The seat belt reminder light is flashing
Are the driver and the front passenger wearing the seat belts? (P. 486)
●The parking brake indicator is on
Is the parking brake released? ( P. 233)
Depending on the situation, other types of warning buzzer may also sound.
( P. 485, 493)
The steering wheel cannot be turned after the engine is
stopped
The windows do not open or close by operating the power
window switches
The engine switch is tur ned off automatically
(vehicles with a smart key system)
A warning buzzer sounds during driving