2018 TOYOTA TUNDRA ECU

1904-1. Before driving
■Trailer brake controller
P. 308
■ Matching trailer ball height to trailer coupler height
■ Before towing
Check that the following conditions are met:
●Ensure that your vehicle’s tires are properly inflated. ( P. 607)
● Trailer tires are inflated according to the trailer manufacture r’s recommen-
dation.
● All trailer lights work as required by law.
● All lights work each time you connect them.
● The trailer ball is set at the proper height for the coupler on the trailer.
● The trailer is level when it is hitched.
Do not drive if the trailer is not level, and check for imprope r tongue weight,
overloading, worn suspension, or other possible causes.
● The trailer cargo is securely loaded.
● The rear view mirrors conform to all applicable federal, state/provincial or
local regulations. If they do not, install rear view mirrors ap propriate for tow-
ing purposes.
● Depress TOW/HAUL button (if equipped). ( P. 200)
● The manual headlight leveling dial is correctly adjusted. ( P. 208)
No matter which class of tow hitch
applies, for a more safe trailer hookup,
the trailer ball setup must be the proper
height for the coupler on the trailer.
Coupler
Trailer ball
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1934-1. Before driving
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Driving
WARNING
■Hitch
Trailer hitch assemblies have different weight capacities estab lished by the
hitch manufacturer. Even though the vehicle may be physically capable of
towing a higher weight, the operator must determine the maximum weight
rating of the particular hitch assembly and never exceed the ma ximum
weight rating specified for the trailer-hitch. Exceeding the ma ximum weight
rating set by the trailer-hitch manufacturer can cause an accid ent resulting
in death or serious personal injuries.
■ When towing a trailer
Toyota recommends trailers with brakes that conform to any appl icable fed-
eral and state/provincial regulations.
● If the gross trailer weight exceeds unbraked TWR, trailer brake s are
required. Toyota recommends trailers with brakes that conform t o all appli-
cable federal and state/provincial regulations.
● Never tap into your vehicle’s hydraulic system, as this will lo wer the vehi-
cle’s braking effectiveness.
● Never tow a trailer without using a safety chain securely attac hed to both
the trailer and the vehicle. If damage occurs to the coupling u nit or hitch
ball, there is danger of the trailer wandering into another lan e.
NOTICE
■When installing a trailer hitch
Use only the position recommended by your Toyota dealer. Do not install
the trailer hitch on the bumper; this may cause body damage.
■ Do not directly splice trailer lights
Do not directly splice trailer lights. Directly splicing traile r lights may damage
your vehicle’s electrical system and cause a malfunction.
■ When towing a fifth wheel trailer
Be careful not to hit the cabin or bed with
the trailer while making a sharp turn.

2164-3. 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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2224-4. Refueling
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.
■ When replacing the fuel tank cap
Do not use anything but a genuine Toyota fuel tank cap designed for your
vehicle. Doing so may cause a fire or other incident which may result in
death or serious injury.

2924-5. Using the driving support systems
■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

3635-7. Connecting Bluetooth®
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Multimedia
Registering a Bluetooth® device
Display the “Bluetooth Setup” screen. (P. 360)
Select “Add”.
When this screen is displayed,
search for the device name dis-
played on this screen on the
screen of your Bluetooth
®
device.
For details about operating the
Bluetooth® device, see the manual
that comes with it.
To cancel the registration, select
“Cancel”.
Register the Bluetooth® device using your Bluetooth® device.
A PIN-code is not required for SS P (Secure Simple Pairing) compatible
Bluetooth® devices. Depending on the type of Bluetooth® device being
connected, a message confirming registration may be displayed o n the
Bluetooth
® device’s screen. Respond and operate the Bluetooth® device
according to the confirmation message.
Check that this screen is dis-
played when registration is
complete.
Bluetooth® compatible phones (HFP) a nd portable audio players
(AVP) can be registered simulta neously. You can register up to 5
Bluetooth
® devices.
How to registe r a Bluetooth® device
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3985-9. Bluetooth® phone
In other situations
Even though all conceivable measures have been taken, the symptom sta-
tus does not change.
The cellular phone is not close enough to this system.
 Bring the cellular phone closer to this system.
The cellular phone is the most likely cause of the symptom.
Turn the cellular phone off, remove and reinstall the battery pack,
and then restart th e cellular phone.
 Enable the cellular phone’s Bluetooth
® connection.
 Stop the cellular phone’s security software and close all appli ca-
tions.
 Before using an application installed on the cellular phone, ca re-
fully check its source and how it s operation might affect this sys-
tem.

4085-12. Antenna
Antenna
Place the included wrench
around the antenna.
When not in use, the wrench is
stored in glove box.
Loosen the antenna with the
wrench and remove it.
Tighten the antenna by one
hand until it will not turn any
more.
Using the wrench, tighten the
antenna an additional 1/8th turn
(20 to 45 degrees) to secure it
in place.
After tightening the antenna,
remove the wrench.
Removing the antenna
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Installing the antenna
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