2019 TOYOTA TUNDRA Owners Manual (in English)

2974-5. Using the driving support systems
4
Driving
■When the front-wheel drive cont rol switch is shifted to “4L”
VSC is automatically turned off.
■ If the “4HI” indicator flashes
The transfer mode may not successfully change. Drive straight a head while
accelerating or decelerating, or drive in reverse.
■ If the “4LO” indicator continues to flash
The transfer mode may not successfully change. Operate the fron t-wheel
drive control switch again.
■ If the “4LO” indicator continues to flash and a buzzer sounds
The shift lever is not in N and/or the vehicle is moving. Stop the vehicle com-
pletely, shift the shift lever to N and make sure that the indi cator stops flash-
ing.
■ If the “4HI” or “4LO” indicator flashes rapidly
There may be a malfunction in the four-wheel drive system. Have the vehicle
inspected by your Toyota dealer immediately.
■ Four-wheel drive usage frequency
You should drive in four-wheel drive for at least 10 miles (16 km) each month.
This will assure that the front drive components are lubricated .
WARNING
■Shifting the front-wheel drive control switch from “2WD” to “4H ” while
driving
Never operate the front-wheel drive control switch if the wheels are slipping.
Stop the slipping or spinning before shifting.
■ When the vehicle is parked
If the shift lever is moved before the “4LO” indicator turns on/off, the transfer
mode may not be shifted completely. The transfer mode disengage s both
the front and rear driveshafts from the powertrain and allows t he vehicle to
move regardless of the shift position. (At this time, the indic ator blinks and
the buzzer sounds.)
Therefore, the vehicle is free to roll even if the automatic tr ansmission is in
P. You or someone else could be seriously injured. You must com plete the
shifting of the transfer mode before placing transmission in P.

2984-5. 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

2994-5. Using the driving support systems
4
Driving
■If the brake system overheats
The system will cease operation and a buzzer will alert the driver. At this time,
the “TRAC OFF” indicator will come on. Stop the vehicle in a safe place.
(There is no problem with continuing normal driving.) The syste m will be auto-
matically restored after a short time.
WARNING
■ To avoid an accident
Failure to do so, a much greater steering effort and more careful cornering
control will be required.
● Do not use the AUTO LSD system in conditions other than when on e of
the drive wheels spinning occurs in a ditch or rough surface.
● Do not drive with the AUTO LSD system continuously turned on.
NOTICE
■Activating while driving
Do not activate the AUTO LSD system if the wheel is slipping. Stop the slip-
ping or spinning before activating.

3004-5. 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.

3014-5. 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

3024-5. 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.

3034-5. 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. 298)
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. 563)
■ 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

3044-5. Using the driving support systems
■Sounds and vibrations caused by the ABS, brake assist, VSC, TRAC,
Trailer Sway Control and hill-start assist control systems
● A sound may be heard from the engine compartment when the brake pedal
is depressed repeatedly, when the engine is started or just aft er the vehicle
begins to move. This sound does not indicate that a malfunction has
occurred in any of these systems.
● Any of the following conditions may occur when the above system s are
operating. None of these indicates that a malfunction has occur red.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard also after the vehicle comes to a s top.
• The brake pedal may pulsate slightly after the ABS is activate d.
• The brake pedal may move down slightly after the ABS is activa ted.
■ Automatic reactivation of TRAC, Trailer Sway Control and VSC sy stems
After turning the TRAC, Trailer Sway Control and VSC systems of f, the sys-
tems will be automatically re-enabled in the following situations:
● When the engine switch is turned off
● If only the TRAC system is turned off, the TRAC will turn on wh en vehicle
speed increases
If both the TRAC and VSC systems are turned off, automatic re-enabling will
not occur when vehicle speed increases.
■ If the brake system overheats
TRAC will cease operation, and the slip indicator will change f rom flashing to
being on continuously to alert the driver. Stop the vehicle in a safe place.
(There is no problem with continuing normal driving.)
■ Shifting to “4L”
VSC and Trailer Sway Control are automatically turned off.