2009 TOYOTA TUNDRA Owners Manual

225
2-4. Using other
driving systems
2
When driving
■If the 4LO indicator light blinks
●If the 4LO indicator continues to blink when shifting between 4H and 4L,
stop the vehicle completely, move the shift lever to N and operate the
switch again.
● If the shift lever is moved before the 4LO indicator turns on/off, the trans-
fer mode may not be shifted completely. The transfer mode disengages
both the front and rear driveshafts from the powertrain and allows the
vehicle to move regardless of the shift position. (At this time, the indicator
blinks and the buzzer sounds.)
Therefore, the vehicle is free to roll even if the automatic transmission is in
P. You or someone else could be seriously injured. You must complete the
shifting of the transfer mode.
To complete the shifting, stop the vehicle completely, return the shift lever
to N, and confirm that the shift was completed (The indicator turns on/off).
● If the engine coolant temperature is too low, the transfer mode may not
be able to be shifted. When the engine is warmer, operate the switch
again.
If the 4LO indicator light continues to blink even after attempting the above,
there may be a malfunction in the engine, the brake system or the four-
wheel drive system. In this case, you may not be able to shift between 4H
and 4L. Have the vehicle inspected by your Toyota dealer immediately.
■ Shifting to 4L
VSC is automatically turned off.
■ 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.

226 2-4. Using other driving systems
CAUTION
■Caution 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 disengages both the
front and rear driveshafts from the power train and allows the vehicle to move
regardless of the shift position. (At this time, the indicator blinks and the
buzzer sounds.)
Therefore, the vehicle is free to roll even if the automatic transmission is in P.
You or someone else could be seriously injured. You must complete the
shifting of the transfer mode. (P. 225)

227
2-4. Using other driving systems
2
When driving
AUTO LSD system
The AUTO LSD system aids traction by using the traction control
system to control engine performance and braking when one of the
rear wheels begins to spin.
The system should be used only wh en one of the rear wheels spin-
ning occurs in a ditch or rough surface.
■ System operation
The system can be used on 2W D models and in 2WD mode on
4WD models.
The system is activated when dr iving at a speed under 62 mph
(100 km/h).
The AUTO LSD system will be
activated with the following
two procedures.
●Press the VSC OFF switch
briefly.
At this time, the slip and AUTO
LSD indicators will come on.
●Stop the vehicle com-
pletely, and press the VSC
OFF switch for more than 3
seconds.
At this time, the slip, VSC OFF
and AUTO LSD indicators will
come on simultaneously.
To turn off the system, push
the switch again.

228 2-4. Using other driving systems
When the AUTO LSD system is operatingVehicles with multi-information display If the rear wheels spin, the slip
indicator flashes to indicate that
the AUTO LSD system have
been controlled the spinning of
the rear wheels.
Vehicles without multi-information display
■ If the engine is turned off and restarted
The AUTO LSD system and the indicators are automatically turned off.
■ If the brake system overheats
The system will cease operation and a buzzer will sound to alert the driver.
Stop the vehicle in a safe place. (There is no problem with continuing normal
driving.)
The system will be automatically restored after a short time.

229
2-4. Using other
driving systems
2
When driving
CAUTION
■To avoid an accident
●Do not use the AUTO LSD system in conditions other than the above.
A much greater steering effort and more careful cornering control will be
required.
● Do not drive with the AUTO LSD system continuously turned on.

230
2-4. Using other driving systems
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 h eavily 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.
■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 the all wheels from spinning when
starting the vehicle or accelerating on slippery roads.

231
2-4. Using other
driving systems
2
When driving
When VSC/TRAC/A-TRAC are operating
Vehicles 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/TRAC/A-TRAC have
been engaged.
A buzzer (intermittent) sounds to
indicate that VSC is operating.
Vehicles without multi-information displayIf 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/TRAC/A-TRAC have
been engaged.
A buzzer (intermittent) sounds to
indicate that VSC is operating.

232 2-4. Using other driving systems
To disable VSC and/or TRAC (2WD models and 2WD mode on 4WD models)
If the vehicle gets stuck in fresh snow or mud, VSC 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 slip and AUTO LSD indica-
tors will come on.
The system is in TRAC off, AUTO
LSD on and VSC 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 slip, VSC OFF and AUTO
LSD indicators will come on.
The system is in TRAC off, AUTO
LSD on and VSC off mode.
■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 slip and VSC OFF indicators
will come on.
The system is all off mode.