2021 TOYOTA TUNDRA 4WD

3184-5. Using the driving support systems
AUTO LSD system
The system can be used on 2WD models and in 2WD mode on 4WD
models. The system is activated when driving at a speed under
62 mph (100 km/h). The AUTO LSD system will be activated with th e
following two procedures.
Press the briefly to turn on
the system.
The “AUTO LSD” indicator will
come on.
To turn off the system, press
again.
Stop the vehicle completely, and
press for more than 3 sec-
onds.
The “AUTO LSD” and VSC off
indicators will come on.
To turn off the system, press
again.
The AUTO LSD system aids trac tion by using the traction con-
trol system to control engine performance and braking when
one of the drive wheels begins to spin.
The system should be used only when one of the drive wheels
spinning occurs in a ditch or rough surface.
System operation

3204-5. Using the driving support systems
Driving assist systems
◆ABS (Anti-lock Brake System)
Helps to prevent wheel lock when the brakes are applied suddenl y,
or if the brakes are applied while driving on a slippery road surface
◆Brake assist
Generates an increased level of braking force after the brake p edal
is depressed when the system de tects a panic stop situation
◆VSC (Vehicle Stability Control)
Helps the driver to control skidding when swerving suddenly or
turning on slippery road surfaces
◆Trailer Sway Control
Helps the driver to control trailer sway by selectively applying brake
pressure for individual wheels and reducing driving torque when
trailer sway is detected
◆TRAC (Traction Control) for 2WD models and 2WD mode on
4WD models
Helps to maintain drive power and prevent the drive wheels from
spinning when starting the vehicl e or accelerating on slippery roads
◆Hill-start assist control
Helps to reduce the backward movement of the vehicle when start -
ing on an uphill
To keep driving safety and perf ormance, the following systems
operate automatically in respon se to various driving situations.
Be aware, however, that these systems are supplementary and
should not be relied upon too heav ily when operating the vehi-
cle.

3214-5. Using the driving support systems
4
Driving
The slip indicator light will flash
while the TRAC/VSC/Trailer Sway
Control systems are operating.
If the vehicle gets stuck in mud, dirt or snow, the TRAC system may
reduce power from the engine to the wheels. Pressing to turn
the system off may make it easier for you to rock the vehicle i n order
to free it.
■Turning off TRAC system
2WD models and 2WD mode on 4WD models
To turn the TRAC system off,
press .
The “AUTO LSD” indicator light
will come on.
Press again to turn the
system back on.
When the TRAC/VSC/Trailer Sway Control systems are operating
Disabling the TRAC systems

3224-5. Using the driving support systems
4H mode on 4WD models
To turn the TRAC system off,
press .
The “TRAC OFF” indicator light
will come on.
Press again to turn the
system back on.
4L mode on 4WD models
To turn the TRAC system off,
press and hold for more
than 3 seconds while the vehi-
cle is stopped.
The VSC off and “TRAC OFF”
indicator light will come on.
Press again to turn the
system back on.

3234-5. Using the driving support systems
4
Driving
■Turning off TRAC, VSC and Trailer Sway Control systems
2WD models and 2WD mode on 4WD models
To turn the TRAC, VSC and Trailer Sway Control systems off, sto p the vehi-
cle completely, and then press and hold
for more than 3 seconds
while the AUTO LSD system is activated. ( P. 318)
4H mode on 4WD models
To turn the TRAC, VSC and Trailer Sway Control systems off, press and
hold
for more than 3 seconds while the vehicle is stopped.
The VSC off and “TRAC OFF” indicator light will come on.
Press
again to turn the system back on.
■ When the VSC or TRAC system is turned off by pressing the VSC o ff
switch
On vehicles with pre-collision system, pre-collision brake assi st and pre-colli-
sion braking will also be disabled. The PCS warning light will come on and
the message will be shown on the multi-information display. ( P. 500)
■ When the “TRAC OFF” indicator light comes on even if VSC off sw itch
has not been pressed.
TRAC cannot be operated. Contact your Toyota dealer.
■ Operating conditions of hill-start assist control
When the following four conditions are met, the hill-start assi st control will
operate:
● The shift lever is in a position other than P or N (when starting off forward/
backward on an upward incline)
● The vehicle is stopped
● The accelerator pedal is not depressed
● The parking brake is not engaged
■ Automatic system cancelation of hill-start assist control
The hill-start assist control will turn off in any of the follo wing situations:
The shift lever is shifted to P or N
● The accelerator pedal is depressed
● The parking brake is engaged
● 2 seconds at maximum elapsed after the brake pedal is released

3334-6. Driving tips
4
Driving
Regulations regarding the use of tire chains vary depending on loca-
tion and type of road. Always chec k local regulations before installing
chains.
■ Tire chain installation
Observe the following precautions when installing and removing chains:
● Install and remove tire chains in a safe location.
● Install tire chains on the rear tires. Do not install tire chains on the front tires.
● Install tire chains on rear tires as tightly as possible. Retig hten chains after
driving 1/4  1/2 mile (0.5  1.0 km).
● Install tire chains following the instructions provided with th e tire chains.
Regulations on the use of tire chains
WARNING
■Driving with snow tires
Observe the following precautions to reduce the risk of acciden ts.
Failure to do so may result in a loss of vehicle control and ca use death or
serious injury.
● Use tires of the specified size.
● Maintain the recommended level of air pressure.
● Do not drive in excess of 75 mph (120 km/h), regardless of the type of
snow tires being used.
● Use snow tires on all, not just some wheels.
● 4WD models: Do not mix tires of different makes, models, tread patterns
or treadwear.
■ Driving with tire chains
Observe the following precautions to reduce the risk of acciden ts.
Failure to do so may result in the vehicle being unable to be d riven safely,
and may cause death or serious injury.
● Do not drive in excess of the speed limit specified for the tir e chains being
used, or 30 mph (50 km/h), whichever is lower.
● Avoid driving on bumpy road surfaces or over potholes.
● Avoid sudden acceleration, abrupt steering, sudden braking and shifting
operations that cause sudden engine braking.
● Slow down sufficiently before entering a curve to ensure that v ehicle con-
trol is maintained.

4787-2. Steps to take in an emergency
If your vehicle needs to be towed
If towing is necessary, we recommend having your vehicle
towed by your Toyota dealer or commercial towing service,
using a wheel-lift type t ruck or flatbed truck.
Use a safety chain system for all towing, and abide by all stat e/
provincial and local laws.
If towing your vehicle with a wheel-lift type truck from the fr ont,
the vehicle's rear wheels and axles must be in good conditions.
(
P. 478, 480)
If they are damaged, use a to wing dolly or flatbed truck.
WARNING
Observe the following precautions.
Failure to do so may result in death or serious injury.
■When towing the vehicle
2WD models: Be sure to transport the
vehicle with all four wheels raised off the
ground. If the vehicle is towed with the
tires contacting the ground, the drivetrain
and related parts may be damaged or an
accident may occur due to a change in
direction of the vehicle.
4WD models: Be sure to transport the
vehicle with all four wheels raised off the
ground. If the vehicle is towed with the
tires contacting the ground, the drivetrain
or related parts may be damaged, the
vehicle may fly off the truck.

4827-2. Steps to take in an emergency
Securely attach cables or chains to the towing hooks.
Take care not to damage the vehicle body.
Enter the vehicle being towed and start the engine.
If the engine does not start, turn the engine switch to ON.
4WD models: Put the front-wheel drive control switch in “2WD”.
Shift the shift lever to N and release the parking brake.
When the shift lever cannot be shifted. (P. 229)
■While towing
If the engine is not running, the power assist for the brakes a nd steering will
not function, marking steering and braking more difficult.
Emergency towing procedure
1
Ty p e AType B
2
3
4