2023 TOYOTA TUNDRA HYBRID key battery

5277-2. Steps to take in an emergency
Owners Manual_USA_M0C052_en
7
When trouble arises
■When the electronic key does
not work properly
●Make sure that the smart key sys-
tem has not been deactivated in
the customization setting. If it is
off, turn the function on.
(Customizable features: P.561)
●Check if battery-saving mode is
set. If it is set, cancel the function.
( P.129)
Use the mechanical key
( P.112) in order to perform the
NOTICE
●Using the lever to open the fuel
filler door may n ot allow for an
adequate reduction in fuel tank
pressure before refueling. To
prevent fuel from spilling out,
turn the cap slowly when remov-
ing it.
●During refueling, fuel may spill
out from the filler opening due to
air being discharged from inside
the fuel tank. Therefore, fill the
fuel tank carefully and slowly.
If the electronic key
does not operate prop-
erly
If communication between
the electronic key and vehi-
cle is interrupted ( P.130)
or the electronic key cannot
be used because the battery
is depleted, the smart key
system and wireless remote
control cannot be used. In
such cases, the doors can
be opened and the hybrid
system can be started by
following the procedure
below.
NOTICE
■In case of a smart key system
malfunction or other key-
related problems
Take your vehicle with all the elec-
tronic keys provided with your
vehicle to your Toyota dealer.
Locking and unlocking
the doors

5297-2. Steps to take in an emergency
Owners Manual_USA_M0C052_en
7
When trouble arises
3 Firmly depress the brake
pedal and check that is
shown on the multi-informa-
tion display.
4 Press the power switch
shortly and firmly.
In the event that the hybrid sys-
tem still cannot be started, con-
tact your Toyota dealer.
■Stopping the hybrid system
Shift the shift lever to P, set the park-
ing brake, shift the shift lever to P
and press the power switch as you
normally do when stopping the
hybrid system.
■Electronic key battery
As the above proc edure is a tempo-
rary measure, it is recommended
that the electronic key battery be
replaced immediate ly when the bat-
tery is depleted. ( P.484)
■Alarm
Using the mechanical key to lock
the doors will not set the alarm sys-
tem. If a door is unlocked using the
mechanical key when the alarm sys-
tem is set, the alarm may be trig-
gered. ( P. 8 2 )
■Changing power switch modes
Release the brake pedal and press
the power switch in step 3 above.
The hybrid system does not start
and modes will be changed each
time the switch is pressed. ( P.198)
If you have a set of jumper (or
booster) cables and a second
vehicle with a 12-volt battery,
you can jump start your vehicle
by following the steps below.
1 Confirm that the electronic
key is being carried.
When connecting the jumper (or
booster) cables, depending on the
situation, the alarm may activate
and doors locked. ( P. 8 3 )
2 Open the hood ( P.456) and
fuse box cover.
Push claw to completely release
If the vehicle 12-volt
batter y is discharged
The following procedures
may be used to start the
hybrid system if the vehi-
cle’s 12-volt battery is dis-
charged.
You can also call your Toy-
ota dealer or a qualified
repair shop.
Restarting the hybrid sys-
tem

5327-2. Steps to take in an emergency
Owners Manual_USA_M0C052_entery recharges aut
omatically while
the hybrid system is operating.)
■When recharging or replacing
the 12-volt battery
●In some cases, i t may not be pos-
sible to unlock the doors using the
smart key system when the 12-
volt battery is discharged. Use the
wireless remote control or the
mechanical key to lock or unlock
the doors.
●The hybrid system may not start
on the first attem pt after reinstall-
ing the 12-volt battery. In that
case, start the hy brid system in
the same manner as when the
electronic key does not operate
properly ( P.528). This is not a
malfunction, as the hybrid system
will start normally on the second
attempt.
●The power switch mode is memo-
rized by the vehicle. When the 12-
volt battery is reconnected, the
system will return to the mode it
was in before the 12-volt battery
was discharged. Before discon-
necting the 12-volt battery, turn
the power switch off.
If you are unsure what mode the
power switch was in before the
12-volt battery discharged, be
especially careful when recon-
necting the 12-volt battery.
●Some systems may require initial-
ization. ( P.571)
■When replacing the 12-volt bat-
tery
●Use a 12-volt battery that con-
forms to European regulations.
●Use a battery that the case size is
same as the previous one (LN2),
20 hours rate capacity (20HR) is
equivalent (55Ah) or greater, and
performance rating (CCA) is
equivalent (345A) or greater.
• If the sizes differ, the 12-volt bat- tery cannot be pr operly secured.
• If the 20 hour rate capacity is low,
even if the time period where the
vehicle is not used is a short time, the 12-volt battery may discharge
and hybrid system may not be
able to start.
●Use a ventilation type calcium bat-
tery
●Use a 12-volt battery with a han-
dle. If a 12-volt battery without a
handle is used, removal is more
difficult.
●When removing the 12-volt bat-
tery:
P.463
●After replacing, firmly attach the
following items to the exhaust hole
of the 12-volt battery.
• Use the exhaust hose that was
attached to the 1 2-volt battery
before replacing and confirm that
it is firmly connected to the hole
section of the vehicle.
• Use the exhaust hole plug
included with the 12-volt battery
replaced or the one installed on
the battery prior to the replaced.
(Depending on the 12-volt battery
to be replace, t he exhaust hole
may be plugged.)
For details, consult your Toyota
dealer.
Exhaust hole cap
Exhaust hole
Exhaust hose

590What to do if... (Troubleshooting)
Owners Manual_USA_M0C052_en
10-1.What to do if... (Troubleshooting)What to do if... (Troubleshooting)
 If you lose your keys, new
keys can be made by your
Toyota dealer. ( P.526)
 If you lose your electronic
keys, the risk of vehicle theft
increases significantly. Con-
tact your Toyota dealer imme-
diately. ( P.526)
 Is the electronic key battery
weak or depleted? ( P.484)
 Is the power switch in ON?
When locking the doors, turn the
power switch off. ( P.198)
 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 the radio wave. ( P.130)
 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. 1 1 6 )
 Did you press the power
switch while firmly depress-
ing the brake pedal?
( P.195)
 Is the shift lever in P?
( P.195)
 Is the electronic key any-
where detectable inside the
vehicle? ( P.128)
 Is the electronic key battery
weak or depleted?
In this case, the h ybrid system can
be started in a temporary way.
(  P.528)
 Is the 12-volt battery dis-
charged? ( P.529)
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 electronic key does
not operate properly
The doors cannot be
locked or unlocked
The rear door cannot be
opened
If you think something is
wrong
The hybrid system does
not start

594Alphabetical Index
Owners Manual_USA_M0C052_en
B
Back window Power back window ............. 163
Back-up lights Replacing light bulbs ............ 490
Battery (12-volt battery) ......... 463 Battery checking................... 463
If the 12-volt battery is dis-charged .............................. 529
Preparing and c hecking before
winter.................................. 395
Warning light ........................ 502
Battery (traction battery) ......... 76
Bed hooks ............ ................... 417
Bed lamp ................................. 410 Replacing light bulbs ............ 490
Blind Spot Monitor (BSM) ...... 267 Enabling/disabling the system........................................... 269
Trailer settings ...................... 100
Boost Meter .............................. 94
Bottle holders ......................... 415
Brake Brake hold ............................ 208
Fluid ............................. 461, 546
Parking brake ....................... 205
Regenerative braking ............. 74
Warning light ........................ 501
Brake assist ............................ 374
Brake hold ............................... 208
Brake Override System .......... 172
Break-in tips ........ ................... 172
Brightness control Instrument panel light control . 94
BSM (Blind Spot Monitor) ...... 267 Enabling/disabling the system........................................... 269
Trailer settings ...................... 100
C
Camper information ...............585
Care..................................442, 445 Aluminum wheel ornaments .442
Aluminum wheels .................442
Exterior .................................442
Hybrid battery (tr action battery)
air intake vents ...................481
Interior ..................................445
Seat belts .............................445
Cargo and luggage .................178
Cargo capacity ........................180
Cargo lamp ..............................410 Replacing light bulbs ............490
Chains......................................397
Child restraint system ..............53 Fixed with a LATCH system ...60
Fixed with a seat belt..............62
Front passenger occupant clas-sification system ...................46
Points to remember ................53
Riding with children ................52
Types of child restraint system installation method ...............55
Using an anchor bracket ........58
Child safety ...............................52 12-volt battery precautions ...464
Airbag precautions .................41
Battery precautions ..............533
Child restraint system .............55
Heated steering wheel and seat heater precautio ns..............407
How your child should wear the seat belt ................................30
Panoramic moon r oof ...........166
Power back window..............163
Power window lock switch ....162
Power window precautions...161
Rear door child-protectors .... 116
Removed electronic key battery precautions .........................485

596Alphabetical Index
Owners Manual_USA_M0C052_en
Downhill assist control system ............................................... 372
Drive distance ........................... 98
Drive information ..................... 98
Drive-start control .................. 177
Driving ..................................... 171 Break-in tips ......................... 172
Correct driving posture ........... 27
Hybrid Electric Vehicle driving tips...................................... 390
Procedures ........................... 171
Winter drive tips ................... 395
Driving information display ..... 97
Driving mode sel ect switch ... 358
Driving position memory ....... 137 Memory recall function ......... 139
Power easy access system .. 137
Driving range ............................ 97
Dynamic radar cruise control with full-speed range ........... 256Approach warning ................ 263
Warning message ................ 265E
ECB (Electronically Controlled Brake System).......................374Warning light.........................501
EDR (Event data recorder) .........8
Elapsed time .............................98
Electric motor (t raction motor)73
Electric Power Steering (EPS) ...............................................375Warning light.........................503
Electronic key ......................... 110 Battery-saving function .........129
If the electronic key does not operate properly .................527
Replacing the battery ...........484
Electronic sunshade ..............164
Electronically Controlled Brake System (ECB) ........................374Warning light.........................501
Electronically modulated air sus- pension ..................................355
Emergency flashers ...............494
Emergency tire puncture .......515
Emergency, in case of If a warning buzzer sounds ..501
If a warning light turns on .....501
If a warning message is dis-played ................................. 511
If the 12-volt battery is dis- charged ..............................529
If the electronic key does not operate properly .................527
If the fuel door cannot be opened ...........................................526
If the hybrid sys tem will not start
...........................................524
If the vehicle is submerged or water on the road is rising ..495
If you have a flat tire .............515
If you lose your keys.............526
If you think something is wrong

Owners Manual_USA_M0C052_en
Alphabetical Index599
I
IdentificationVehicle.................................. 541
Ignition switch (power switch) ............................................... 195Auto power off function ........ 198
Changing the power switch modes ................................ 198
If your vehicle has to be stopped in an emergency................. 494
Starting the hybrid system.... 195
Immobilizer system .................. 81
Indicators .................................. 89
Initialization Items to initialize................... 571
Parking Support Brake ......... 292
Power windows .................... 160
Tire pressure warning system........................................... 470
Inside rear view mirror........... 145
Instrument panel light control. 94
Intercooler ............................... 461
Intercooler coolant ................. 460 Capacity ............................... 544
Checking .............................. 460
Interior lights .......................... 410 Wattage ................................ 548
Interior lights list .................... 410
Intuitive parking assist .......... 274 Enabling/disabling the system........................................... 275
Function ............................... 274
Warning lights....................... 504
Warning message ................ 276
J
Jam protection function Electronic sunshade ............. 165
Panoramic moon roof ........... 165
Power running boards .......... 118
Power windows .................... 160
K
Keyless entrySmart key system .................128
Wireless remote control........ 111
Keys ......................................... 110 Battery-saving function .........129
Electronic key ....................... 110
If the electronic key does not operate properly .................527
If you lose your keys.............526
Key number plate ................. 110
Keyless entry ........ 113, 120, 128
Mechanical key..................... 110
Power switch ........................195
Replacing the battery ...........484
Warning buzzer ....................128
Wireless remote control........ 111
Knee airbags .............................36
L
Lane Tracing Assist (LTA) ......242 Operation..............................242
Warning lights .......................504
Warning messages ...............252
Language (multi-information dis- play) .........................................99
LATCH anchors.........................60
Lever Auxiliary catch lever .............456
Hood lock release lever ........456
Shift lever .............................201
Turn signal lever ...................204
Wiper lever ...........................218
License plate lights Light switch........................... 211
Replacing light bulbs ............490
Light bulbs Replacing .............................489
Lights Ambient lights ....................... 411
Automatic High Beam system

602Alphabetical Index
Owners Manual_USA_M0C052_en
........................................... 289
Parking Support Brake function (rear-crossing vehicles) ...... 295
Parking Support Brake function (static objects) .................... 292
Warning lights....................... 504
Warning message ................ 291
Power back window ............... 163
Power bed step ....................... 126
Power control unit .................... 76
Power control unit coolant .... 460 Capacity ............................... 544
Checking .............................. 460
Power easy access system ... 137
Power outlet ............................ 426
Power running boards ........... 117
Power steering (Electric power steering system)Warning light ........................ 503
Power switch .......................... 195 Auto power off function ........ 198
Changing the power switch modes ................................ 198
If your vehicle has to be stopped in an emergency................. 494
Starting the hybrid system.... 195
Power switch light .................. 410
Power windows Door lock linked window opera-tion ..................................... 161
Jam protection function ........ 160
Operation ............................. 160
Window lock switch .............. 162
Pre-Collision System (PCS)... 230 Enabling/disabling the system........................................... 234
Function ............................... 230
Warning light ........................ 503
R
Radar cruise control (dynamic radar cruise control with full- speed range) .........................256
Radiator ...................................461
RCTA (Rear Cross Traffic Alert) ...............................................281Enabling/disabling the system ...........................................282
Warning lights .......................505
Warning message.................282
Rear Cross Traffic Alert (RCTA) ...............................................281Enabling/disabling the system ...........................................282
Warning lights .......................505
Warning message.................282
Rear differential lock system.364
Rear door sunshades .............432
Rear seats ...............................134 Cleaning ...............................445
Head restraints .....................140
Seat heaters ....... ..................407
Seat ventilators.....................407
Rear turn signal lights............204 Replacing light bulbs ............490
Turn signal lever ...................204
Rear view mirror Digital Rear-view Mirror ........146
Inside rear view mirror ..........145
Outside rear view mirrors .....155
Rear window defogger ...........401
Refueling ............ .....................222
Capacity ...............................542
Fuel types .............................542
Opening the fuel tank cap ....222
When the fuel door cannot be opened ...............................526
Regenerative braking ...............74 Warning lights .......................501
Replacing Electronic key battery ...........484
Fuses....................................486
Light bulbs ............................489
Road accident cautions ...........77