2021 TOYOTA TUNDRA ECU

2444-3. Operating the lights and wipers
Fog light switch
(U.S.A.) or (Canada)
Turns the front fog lights
off
Turns the front fog lights
on
■Fog lights can be used when
The parking lights are on or the headlights are on in low beam.
: If equipped
The fog lights secure excellent visibility in difficult driving con-
ditions, such as in rain and fog.
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2494-4. Refueling
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Driving
WARNING
■When refueling the vehicle
Observe the following precautions while refueling the vehicle. Failure to do
so may result in death or serious injury.
● After exiting the vehicle and before opening the fuel door, tou ch an
unpainted metal surface to discharge any static electricity. It is important to
discharge static electricity before refueling because sparks re sulting from
static electricity can cause fuel vapors to ignite while refuel ing.
● Always hold the grips on the fuel tank cap and turn it slowly to remove it.
A whooshing sound may be heard when the fuel tank cap is loosen ed.
Wait until the sound cannot be heard before fully removing the cap. In hot
weather, pressurized fuel may spray out the filler neck and cause injury.
● Do not allow anyone that has not discharged static electricity from their
body to come close to an open fuel tank.
● Do not inhale vaporized fuel.
Fuel contains substances that are harmful if inhaled.
● Do not smoke while refueling the vehicle.
Doing so may cause the fuel to ignite and cause a fire.
● Do not return to the vehicle or touch any person or object that is statically
charged.
This may cause static electricity to build up, resulting in a p ossible ignition
hazard.
■ When refueling
Observe the following precautions to prevent fuel overflowing f rom the fuel
tank:
● Securely insert the fuel nozzle into the fuel filler neck.
● Stop filling the tank after the fuel nozzle automatically click s off.
● Do not top off the fuel tank.
NOTICE
■Refueling
Do not spill fuel during refueling.
Doing so may damage the vehicle, such as causing the emission c ontrol
system to operate abnormally or damaging fuel system components or the
vehicle’s painted surface.

3114-5. Using the driving support systems
4
Driving
■Conditions under which the Blind Spot Monitor function may not func-
tion correctly
● The Blind Spot Monitor function may not detect vehicles correct ly in the fol-
lowing conditions:
• During bad weather such as heavy rain, fog, snow, etc.
• When ice or mud, etc., is attached to the rear bumper
• When driving on a road surface that is wet due to rain, standi ng water,
etc.
• When there is a significant difference in speed between your v ehicle and
the vehicle that enters the detection area
• When a vehicle is in the detection area from a stop and remains in the detection area as your vehicle accelerates
• When driving up or down consecutive steep inclines, such as hills, a dip
in the road, etc.
• When multiple vehicles approach with only a small gap between each vehicle
• When vehicle lanes are wide, and the vehicle in the next lane is too far
away from your vehicle
• When the vehicle that enters the detection area is traveling a t about the
same speed as your vehicle
• When towing anything such as trailer, boat, etc.
• When there is a significant difference in height between your vehicle and
the vehicle that enters the detection area
• Directly after the BSM function is set to on
• When towing a trailer
• When items such as a bicycle carrier are installed on the rear of the vehi-
cle
● Instances of the Blind Spot Monitor function unnecessarily dete cting a vehi-
cle and/or object may increase under the following conditions:
• When there is only a short distance between your vehicle and a guardrail,
wall, etc.
• When there is only a short distance between your vehicle and a following
vehicle
• When vehicle lanes are narrow and a vehicle driving 2 lanes ac ross from
your vehicle enters the detection area
• When items such as a bicycle carrier are installed on the rear of the vehi-
cle

3775-3. Using the storage features
5
Interior features
Luggage compartment features
Deck hooks are provided for
securing loose items.
Deck hooks

3855-4. Using the other interior features
5
Interior features
Garage door opener
The HomeLink® wireless control system in your vehicle has 3 buttons
which can be programmed to operate 3 different devices. Refer to the
programming methods on the following pages to determine the
method which is approp riate for the device.
HomeLink
® indicator light
Garage door operation indica-
tors
Buttons
■Before programming the HomeLink®
● During programming, it is possible that garage doors, gates, or
other devices may operate. For this reason, make sure that peo-
ple and objects are clear of the garage door or other devices t o
prevent injury or other potential harm.
● It is recommended that a new battery be placed in the remote
control transmitter for mo re accurate programming.
● Garage door opener motors manufactured after 1995 may be
equipped with rolling code pro tection. If this is the case, you may
need a stepladder or other sturdy, safe device to reach the
“learn” or “smart” button on the garage door opener motor.
: If equipped
The garage door opener can be programmed to operate garage
doors, gates, entry doors, door locks, home lighting systems,
security systems, and other devices.
HomeLink®
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3975-4. Using the other interior features
5
Interior features
WARNING
■When driving the vehicle
Do not adjust the display. Be sure to adjust the display only when the vehi-
cle is stopped.
■ When doing the circling calibration
Be sure to secure a wide space, and watch out for people and ve hicles in
the neighborhood. Do not violate any local traffic rules while performing cir-
cling calibration.
NOTICE
■ To avoid the compass malfunctions
Do not place magnets or any metal objects near the inside rear view mirror.
Doing this may cause a malfunction of the compass sensor.
■ To ensure normal operation of the compass
● Do not perform circling calibration of the compass in a place w here the
earth’s magnetic field is subject to interference by artificial magnetic fields.
● During calibration, do not operate electric systems (moon roof, power win-
dows, etc.) as they may interfere with the calibration.

4096-2. Maintenance
6
Maintenance and care
Vehicle interior
ItemsCheck points
Accelerator pedal• The accelerator pedal should move smoothly(without uneven pedal effort or catching).
Automatic transmission
“Park” mechanism• When parked on a slope and the shift lever isin P, is the vehicle securely stopped?
Brake pedal
• Does the brake pedal move smoothly?
• Does the brake pedal have appropriate clear-ance from the floor? ( P. 547)
• Does the brake pedal have the correct amount of free play? ( P. 547)
Brakes
• The vehicle should not pull to one side when
the brakes are applied.
• The brakes should work effectively.
• The brake pedal should not feel spongy.
• The brake pedal should not get too close to the floor when the brakes are applied.
Head restraints• Do the head restraints move smoothly andlock securely?
Indicators/buzzers• Do the indicators and buzzers function prop-erly?
Parking brake
• Does the parking brake pedal movesmoothly?
• When parked on a slope and the parking brake is on, is the vehicle securely stopped?
Seat belts• Do the seat belts operate smoothly?
• The seat belts should not be damaged.
Seats• Do the seat controls operate properly?
Steering wheel
• Does the steering wheel rotate smoothly?
• Does the steering wheel have the correctamount of free play?
• There should not be any strange sounds com-
ing from the steering wheel.

4716-3. Do-it-yourself maintenance
6
Maintenance and care
■When installing the rubber cover of the headlight
Ensure the rubber cover is securely attached.
■ When replacing the light bulbs
Confirm that they are properly engaged with the bulb base and that there is
no light leakage.
■ LED Lights
The headlights (LED type), front fog lights (LED type), parking lights (LED
type), daytime running light and side turn signal lights consis t of a number of
LEDs. If any of the LEDs burn out, take your vehicle to your To yota dealer to
have the light replaced.
■ Condensation build-up on the inside of the lens
Temporary condensation build-up on the inside of the headlight lens does not
indicate a malfunction. Contact your Toyota dealer for more information in the
following situations:
● Large drops of water have built up on the inside of the lens.
● Water has built up inside the headlight.Fit the rubber cover outer circumfer-
ence in firmly.
Fit the rubber cover around the light
bulb in until the light bulb plug can be
seen.
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