2021 TOYOTA TUNDRA replacing the battery

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)

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.

599Alphabetical index
Back windowBack window ......................... 175
Power back window .............. 176
Back-up lights
Replacing light bulbs............. 468
Wattage ................................ 550
Battery ...................................... 422
If the vehicle battery is discharged .......................... 525
Preparing and checking
before winter....................... 331
Warning light ......................... 485
Blind Spot Monitor (BSM) ....... 305
Bluetooth
®*
Bottle holders .......................... 372
Brake
Fluid ...................................... 420
Parking brake........................ 233
Warning buzzer..................... 485
Warning light ......................... 485
Brake assist ............................. 320
Brake Override System ........... 185
Break-in tips ............................. 186
Brightness control Instrument panel light
control................................. 107
BSM (Blind Spot Monitor) ....... 305 Blind Spot Monitor
function ............................... 309
Rear Cross Traffic Alert function ............................... 312 Camper information ................ 588
Card holder .............................. 364
Care .................................. 400, 403
Aluminum wheels ................. 400
Exterior ................................. 400
Interior .................................. 403
Seat belts.............................. 404
Cargo capacity......................... 195
Cargo lamp Light switch ........................... 359
Replacing light bulbs ............ 470
Wattage ................................ 550
CD player
*
Certification label ............ 200, 541
Chains ...................................... 332
Child restraint system............... 59
Booster seats, definition ......... 60
Booster seats, installation....... 69
Convertible seats, definition ... 60
Convertible seats, installation ............................ 68
Front passenger occupant
classification syst em ............ 53
Infant seats, definition............. 60
Infant seats, installation .......... 67
Installing CRS with LATCH anchors ............ 65
Installing CRS with seat
belts...................................... 67
Installing CRS with top tether strap........ 70, 73
BC
*: Refer to “NAVIGATION AND MULTIMEDIA SYSTEM OWNER
’S MANUAL”.

604Alphabetical index
JackPositioning the jack ............... 513
Vehicle-equipped jack........... 507
Jack handle .............................. 511
Jam protection function
Moon roof.............................. 179
Power windows ..................... 173
Keyless entry ........................... 128 Smart key system ................. 128
Wireless remote control ........ 128
Keys .......................................... 120
Engine switch........................ 217
If you lose your keys ............. 123
Ignition switch ....................... 217
Key number plate.................. 120
Keyless entry ........................ 128
Replacing the battery ............ 451
Wireless remote control ........ 128
Knee airbags .............................. 41
Lane Departure Alert (LDA) ...................................... 272
Language (multi-information display) ... 110
LATCH anchors ................... 65, 66
LDA
(Lane Departure Alert) .......... 272 Lane departure alert
function ............................... 272
Vehicle sway warning ........... 273
Lever
Auxiliary catch lever .............. 414
Hood lock release lever ........ 414
Shift lever .............................. 225
Turn signal lever ................... 232
Wiper lever............................ 245 License plate lights
Light switch ........................... 234
Replacing light bulbs ............ 469
Wattage ................................ 550
Light bulbs Replacing.............................. 459
Wattage ................................ 550
Lights Automatic High Beam ........... 239
Cargo lamp switch ................ 359
Engine switch light (ignition switch light) ........... 357
Fog light switch ..................... 244
Headlight switch ................... 234
Illuminated entry system ....... 359
Interior lights ......................... 358
Interior lights list.................... 357
Outer foot light ...................... 357
Personal lights ...................... 358
Replacing light bulbs ............ 457
Turn signal lever ................... 232
Vanity lights .......................... 378
Wattage ................................ 550
Load capacity .......................... 195
Luggage compartment features .................................. 377
Luggage storage box .............. 375
J
K
L

606Alphabetical index
Parking assist sensors (intuitive parking assist) ....... 298
Parking brake ........................... 233 Operation .............................. 233
Parking brake engaged
warning buzzer ................... 485
Parking brake engaged
warning message ............... 495
Parking lights ........................... 234 Light switch ........................... 234
Replacing light bulbs..... 463, 470
Wattage ................................ 550
PCS
(Pre-Collision System) .......... 260 Pre-collision brake assist ...... 261
Pre-collision braking ............. 261
PCS warning ......................... 261
Warning light ......................... 488
Warning message ................. 493
Pen holder ................................ 367
Personal lights ......................... 358 Light switch ........................... 357
Wattage ................................ 550
Power back window ................ 176
Power easy access system .... 152
Power outlets ........................... 379
Power steering fluid ................ 421
Power windows........................ 172 Jam protection function......... 173
Operation .............................. 172
Window lock switch............... 172
Pre-Collision System (PCS) ...................................... 260 Radar cruise control
(dynamic radar
cruise control) ....................... 280
Radiator .................................... 420
Radio
*
Rear personal lights ................ 358
Rear seat
Adjustment precautions ........ 151
Child seats/child restraint system installation . ............... 63
Cleaning ............................... 403
Head restraints ..................... 157
Raising the bottom cushion ............................... 150
Rear side marker lights........... 234 Light switch ........................... 234
Replacing light bulbs ............ 468
Wattage ................................ 550
Rear step bumper .................... 137
Rear turn signal lights ............ 232
Replacing light bulbs ............ 468
Turn signal lever ................... 232
Wattage ................................ 550
Rear view mirror Inside rear view mirror .......... 164
Outside rear view mirrors ..... 167
Rear view monitor system
*
Refueling .................................. 248 Capacity................................ 542
Fuel types ............................. 542
Opening the fuel tank cap..... 250
Replacing Fuses .................................... 454
Light bulbs ............................ 457
Tires...................................... 506
Wireless remote control battery ................................ 451
Reporting safety defects for U.S. owners...................... 576
Resetting the message
indicating maintenance
is required.............................. 407
PR

611Alphabetical index
Warning buzzersBrake system ....... ......... 485, 495
Downshifting ......................... 231
Intuitive parking assist .......... 299
Key reminder ........................ 218
Light reminder ....................... 238
Open door ............................. 494
Open moon roof .................... 181
PCS (Pre-Collision System)........ 488
Seat belt reminder ................ 486
Warning lights.......................... 101 ABS....................................... 486
Brake system ....... ................. 485
Charging system ................... 485
LDA (Lane Departure Alert)........ 488
Low fuel level ........................ 486
Malfunction indicator lamp .... 485
Master warning light.............. 486
Parking brake warning light ....................... 486
PCS (Pre-Collision System)........ 488
Seat belt reminder light ........ 486
Slip indicator ......................... 487
SRS ...................................... 485
Tire pressure......................... 487
Warning messages .................. 493
Washer...................................... 245 Checking ............................... 425
Low windshield washer fluid
warning message ............... 495
Preparing and checking
before winter....................... 331
Switch ................................... 245 Washing and waxing ............... 400
Weight
Cargo capacity...................... 195
Cargo weight rating .............. 590
Gross axle weight rating ....... 592
Gross combination weight rating ....................... 201
Gross vehicle weight rating .................................. 592
Load limits ............................ 195
Towing capacity ............ 195, 201
Trailer Weight Rating ......................... 195, 201
TWR ............................. 195, 201
Vehicle capacity weight ......................... 195, 538
Wheels Replacing wheels ................. 446
Size....................................... 548
Window glasses ...................... 172
Window lock switch ................ 172
Windows................................... 172 Back window......................... 175
Back window defogger ..................... 342, 349
Power back window .............. 176
Power windows..................... 172
Windshield wiper
de-icer ............................ 343, 350
Windshield wipers ................... 245
Winter driving tips ................... 331
Wireless remote control key Locking/Unlocking ................ 128
Replacing the battery............ 451
WMA disc
*
W
*: Refer to “NAVIGATION AND MULTIMEDIA SYSTEM OWNER
’S MANUAL”.