2012 TOYOTA TUNDRA 4WD

249
2-4. Using other driving systems
2
When driving
Driving assist systems
To help enhance driving safety and performance, the following sys-
tems operate automatically in res ponse to various driving situations.
Be aware, however, that these systems are supplementary and
should not be relied upon too heavi ly when operating the vehicle.
■ABS (Anti-lock Brake System)
Helps to prevent wheel lock when the brakes are applied suddenly, 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 pedal is
depressed, when the system detects 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 engine torque when trailer
sway is detected.
Trailer Sway Control is part of the VSC system and will not operate if
VSC is turned off or experiences a malfunction.
■ TRAC (Traction Control) for 2WD models and 2WD mode on
4WD models
Maintains drive power and prevents the rear wheels from spinning
when starting the vehicle or accelerating on slippery roads.
■A-TRAC (Active Traction Control) for 4WD mode on 4WD
models
Maintains drive power and prevents all wheels from spinning when
starting the vehicle or accelerating on slippery roads.

250 2-4. Using other driving systems
When VSC/Trailer Sway Control/TRAC/A-TRAC are operatingVehicles with multi-information display If the vehicle is in danger of slip-
ping, or if the rear wheels (2WD
models and 2WD mode on 4WD
models) or all wheels (4WD
mode on 4WD models) spin, the
slip indicator flashes to indicate
that VSC/Trailer Sway Control/
TRAC/A-TRAC have been
engaged.
Vehicles without multi-information display

251
2-4. Using other
driving systems
2
When driving
To disable VSC, Trailer Sway Control and/or TRAC (2WD models
and 2WD mode on 4WD models)
If the vehicle gets stuck in fresh snow or mud, VSC, Trailer Sway
Control and TRAC may reduce power from the engine to the wheels.
You may need to turn the system off to enable you to rock the vehicle
in order to free it.
■ TRAC OFF mode
Press the VSC OFF switch
briefly.
The AUTO LSD indicator will
come on.
The system is in TRAC off, AUTO
LSD on and VSC, Trailer Sway
Control on mode.
Push the switch again to turn the
system back on.
■AUTO LSD mode
Stop the vehicle completely, and
press the VSC OFF switch for
more than 3 seconds, when the
system is in the TRAC OFF
mode.
The VSC OFF and AUTO LSD
indicators will come on.
The system is in TRAC off, AUTO
LSD on and VSC, Trailer Sway
Control off mode.

252 2-4. Using other driving systems
■VSC OFF mode
Stop the vehicle completely, and
press the VSC OFF switch for
more than 3 seconds, when the
system is in the AUTO LSD
mode.
The VSC OFF and TRAC OFF
indicators will come on.
The system is all off mode.
To disable VSC, Trailer Sway Control or A-TRAC (4H mode on 4WD models)
If the vehicle gets stuck in fresh snow or mud, VSC, Trailer Sway
Control or A-TRAC may reduce power from the engine to the wheels.
You may need to turn the system off to enable you to rock the vehicle
in order to free it.
■A-TRAC OFF mode
Press the VSC OFF switch
briefly.
The TRAC OFF indicator will
come on.
The system is in A-TRAC off and
VSC, Trailer Sway Control on
mode.
Push the switch again to turn the
system back on.

253
2-4. Using other
driving systems
2
When driving
■VSC OFF mode
Stop the vehicle completely, and
press the VSC OFF switch for
more than 3 seconds.
The VSC OFF and TRAC OFF
indicators will come on.
The system is all off mode.
Push the switch again to turn the
system back on.
To disable A-TRAC (4L mode on 4WD models)
If the vehicle gets stuck in fresh snow or mud, A-TRAC may reduce
power from the engine to the wheels. You may need to turn the sys-
tem off to enable you to rock the vehicle in order to free it. Stop the vehicle completely, and
press the VSC OFF switch for
more than 3 seconds.
The TRAC OFF indicators will
come on.
Push the switch again to turn the
system back on.

269
2-5. Driving information
2
When driving
Regulations on the use of snow chains
● Regulations regarding the use of tire chains vary according to loca-
tion and type of road. Always check local regu lations before install-
ing chains.
● Install the chains on the rear tires.
● Retighten the chains after drivi ng 1/4 - 1/2 mile (0.5 - 1.0 km).
■Snow 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 only. Do not install tire chains on the
front tires.
● Install tire chains following the instructions provided in the accompanying
instructions.
CAUTION
■Driving with snow tires
Observe the following precautions to reduce the risk of accidents.
Failing to do so may result in a loss of vehicle control and cause death or
serious injury.
●Use tires of the size specified for your vehicle.
● 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.
● Snow tires should be installed on all wheels.
● 4WD models:
Do not mix tires of different makes, models, tread patterns or treadwear.

276 2-5. Driving information
GCWR, TWR, Unbraked TWR, Fifth wheel and Gooseneck towing TWR
Confirm that the gross trailer weight, gross combination weight, gross
vehicle weight, gross axle weight and tongue weight are all within the
limits.
■GCWR
* and TWR*
Regular Cab models
*: These models meet the tow-vehicle trailering requirement of SAE
International per SAE J2807.
Model code*1EngineDriving
systemBed
typeGCWRTWR
GSK50L-TRADKA 4.0L V6
(1GR-FE) engine 2WDStandard
10000 lb.
(4535 kg) 4900 lb.
(2220 kg)
GSK51L-THADKA Long 4800 lb.
(2175 kg)
UPK50L-TRTDKA 4.6L V8
(1UR-FE) engine
2WDStandard
12500 lb.
(5670 kg)
*27100 lb.
(3220 kg)*2
14000 lb.
(6350 kg)*38600 lb.
(3900 kg)*3
USK51L-THTDKA
5.7L V8
(3UR-FE) engine Long
14000 lb.
(6350 kg)
*28400 lb.
(3810 kg)*2
16000 lb.
(7255 kg)*310400 lb.
(4715 kg)*3
USK55L-TRTDKA
4WDStandard 14000 lb.
(6350 kg)
*28200 lb.
(3715 kg)*2
15500 lb.
(7030 kg)*39700 lb.
(4395 kg)*3
15000 lb.
(6800 kg)*3,49200 lb.
(4170 kg)*3,4
USK56L-THTDKA Long14000 lb.
(6350 kg)
*28100 lb.
(3670 kg)*2
16000 lb.
(7255 kg)*310100 lb.
(4580 kg)*3

277
2-5. Driving information
2
When driving
*1: The model code is indicated on the Certification Label. (P. 668)*2: Without towing package*3: With towing package*4: P275/55R20 tires
Double Cab models
USK55L-TRTDGA
5.7L V8
(3UR-FBE) engine 4WDStandard 14000 lb.
(6350 kg)
*28200 lb.
(3715 kg)*2
15500 lb.
(7030 kg)*39700 lb.
(4395 kg)*3
15000 lb.
(6800 kg)*3,49200 lb.
(4170 kg)*3,4
USK56L-THTDGA Long14000 lb.
(6350 kg)
*28100 lb.
(3670 kg)*2
16000 lb.
(7255 kg)*310100 lb.
(4580 kg)*3
Model code*1EngineDriving
systemBed
typeGCWRTWR
GSK51L-CRASKA 4.0L V6
(1GR-FE) engine
2WD
Standard 10000 lb.
(4535 kg) 4500 lb.
(2040 kg)
UPK51L-CRTSKA 4.6L V8
(1UR-FE) engine 12500 lb.
(5670 kg)
*26700 lb.
(3035 kg)*2
14000 lb.
(6350 kg)*38200 lb.
(3715 kg)*3
UPK56L-CRTSKA 4WD12500 lb.
(5670 kg)
*26400 lb.
(2900 kg)*2
14000 lb.
(6350 kg)*37900 lb.
(3580 kg)*3
Model code*1EngineDriving
systemBed
typeGCWRTWR