2021 TOYOTA 4RUNNER warning

2954-5. Using the driving support systems
4
Driving
4RUNNER (U)■
Shifting from L4 to H4
Stop the vehicle completely and continue to depress the brake
pedal.
Shift the shift lever to N.
Ty p e A
Shift the front-wheel drive control lever to H4.
Ty p e B
Push the “UNLOCK” button and turn the front-wheel drive control
switch to H4.
The low speed four-wheel drive indicator will go off.
■When the front-wheel drive control lever or switch is shifted t o L4
VSC and TRAC are automatically turned off.
■ If the four-wheel dri ve indicator flashes
The transfer mode may not successfully change. Drive straight a head while
accelerating or decelerating, or drive in reverse.
■ If the low speed four-wheel dri ve indicator continues to flash
The transfer mode may not successfully change. Operate the four -wheel
drive control switch again.
■ If the low speed four-wheel dri ve 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 four-wheel drive or low speed four-wheel drive 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 co ntrol lever or switch from H2 to H4
while driving
Never operate the front-wheel drive control lever or switch if the wheels are
slipping.
Stop the slipping or spinning before shifting.
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2994-5. Using the driving support systems
4
Driving
4RUNNER (U)■
If the low speed four-wheel dri ve 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 low speed four-wheel dri ve indicator or the center differential lock
indicator flashes rapidly
There may be a malfunction in the four-wheel drive system. Have the vehicle
inspected by your Toyota dealer immediately.
WARNING
■ Operating the four-wh eel drive control switch
Never operate the four-wheel drive control switch if the wheels have lost
traction. Doing so may cause an accident resulting in death or serious
injury.
Stop the wheels from slipping or spinning before operating the switch.
NOTICE
■To prevent damage to the center differential
● For normal driving on dry and hard surface roads, unlock the ce nter differ-
ential.
● Unlock the center differential after the wheels are out of the ditch or off the
slippery or bumpy surface.
● Do not lock or unlock the center differential when the vehicle is turning or
when its wheels are spinning freely off the ground.

3014-5. Using the driving support systems
4
Driving
4RUNNER (U)
If all wheels spin, the slip indicator
flashes to indicate that the active
traction control system has been
engaged.
■When the rear differential is locked (vehicles with a rear diff erential lock
system)
The active traction control system is activated only when vehic le speed is
less than 4 mph (6 km/h).
■ Sounds and vibrations caused by the active traction control sys tem
● A sound may be heard from the engine compartment when the engin e is
started or just after the vehicle begins to move. This sound do es not indicate
that a malfunction has occurred in the system.
● Vibrations may be felt through the vehicle body and steering. T his may
occur when the system is operating.
■ If the brake system overheats
The system will cease operation and a buzzer will sound to aler t the driver. At
this time, the “A-TRAC” indicator will go off and the “TRAC OFF ” indicator will
come on. Stop the vehicle in a safe place. (There is no problem with continu-
ing normal driving.)
The system will be automatically restored after a short time.
When the active traction co ntrol system is operating
WARNING
■The active traction control system may not operate effectively when
Directional control and power may not be achievable while driving on slip-
pery road surfaces, even if the active traction control system is operating.
Do not drive the vehicle in conditions where stability and powe r may be lost.

3034-5. Using the driving support systems
4
Driving
4RUNNER (U)
If the drive wheels spin, the slip
indicator flashes to indicate that
the AUTO LSD system has con-
trolled the spinning of the drive
wheels.
■If the engine is turned off and restarted
The AUTO LSD system and the indicators are automatically turned off.
■ Reactivation of the VSC syst em linked to vehicle speed
When the AUTO LSD system is turned on, the VSC, TRAC and Traile r Sway
Control systems will turn on automatically if vehicle speed inc rease.
■ If the brake system overheats
The system will cease operation and a buzzer will alert the driver. At this time,
the “AUTO LSD” indicator will flash and the “TRAC OFF” indicator will come
on. Stop the vehicle in a safe place. (There is no problem with continuing nor-
mal driving.) The system will be automatically restored after a short time.
When the AUTO LSD system is operating
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 slipping or spinning before activating.

3054-5. Using the driving support systems
4
Driving
4RUNNER (U)
Before using the rear differential lock system:
Stop the vehicle, shift the shift lever to N and shift the front-wheel
drive control lever into L4 to see if this is sufficient. If this has no
effect, additionally use the re ar differential lock system.
Be sure the wheels have stopped spinning.
Press the rear differential lock switch.
Gently depress the accelerator pedal.
After the rear differential is locked, the indicator will come on.
Unlock the rear differential as soon as the vehicle moves.
To unlock the rear different ial, press the switch again.
■Locking the rear differential
The following systems do not operate when the rear differential is locked. It is
normal operation for the ABS warning light and VSC OFF indicato r to be on at
this time.
•ABS
• Multi Terrain ABS
• Brake assist system
•VSC
• Hill-start assist control
■ The rear differential lock is disengaged when
The front-wheel drive control lever or switch is shifted to H2 or H4.
Never forget to turn off the switch after using this feature.
■ After unlocking the rear differential
Check that the indicator goes off.
■ If the rear differential lo ck indicator flashes rapidly
There may be a malfunction in the rear differential lock system . Have the
vehicle inspected by your Toyota dealer immediately.
Using the rear diffe rential lock system
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3064-5. Using the driving support systems
4RUNNER (U)
WARNING
■To avoid an accident
● Do not use the rear differential lock system except when wheel spinning
occurs in a ditch or on a slippery or rugged surface. Large steering effort
and careful cornering control will be required.
● Do not lock the rear differential until the wheels have stopped spinning.
Otherwise, the vehicle may move in an unexpected direction when the dif-
ferential lock is engaged, resulting in an accident. This may also lead to
possible damage to rear differential lock component parts.
● Do not drive over 5 mph (8 km/h) when the rear differential is locked.
● Do not keep driving with the rear differential lock switch on.

3094-5. Using the driving support systems
4
Driving
4RUNNER (U)■
Sounds and vibrations caused b y the downhill assist control system
● A sound may be heard from the engine compartment when the engin e is
started or just after the vehicle begins to move. This sound do es not indicate
that a malfunction has occurred in downhill assist control syst em.
● Either of the following conditions may occur when the downhill assist control
system is operating. None of these are indicators that a malfun ction has
occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard after the vehicle comes to a stop.
■ System malfunction
In the following cases, have your vehicle checked by your Toyot a dealer.
● The downhill assist control system indicator does not come on w hen the
engine switch is turned to the “ON” position (vehicles without a smart key
system) or the engine switch is turned to IGNITION ON mode (veh icles with
a smart key system).
● The downhill assist control system indicator does not come on w hen the
“DAC” switch is pressed.
● The slip indicator comes on.
WARNING
■When using downhill assist control system
Do not rely overmuch on the downhill assist control system. Thi s function
does not extend the vehicle’s performance limitations. Always t horoughly
check the road conditions, and drive safely.
■ The system may not operate on the following surfaces, which may lead
to an accident causing death or serious injury
● Slippery surfaces such as wet or muddy roads
● Icy surface
● Unpaved roads

3124-5. Using the driving support systems
4RUNNER (U)■
Automatic system cancelation
In the following situations, the system will cease operation an d a buzzer will
sound to alert the driver. The Cr awl Control indicator will flash until the system
is turned off completely.
● When the shift lever is shifted to P or N
● When the front-wheel drive control lever or switch is shifted t o H4
● When the driver’s door is opened
● When the system is malfunctioning
● When the brake system overheats
Stop the vehicle in a safe place. (There is no problem with con tinuing normal
driving.)
● When the automatic transmission system overheats
Stop the vehicle in a safe place until the automatic transmissi on fluid tem-
perature warning light goes off.
■ Sounds and vibrations caused by the Crawl Control system
● A sound may be heard from the engine compartment when the engin e is
started or just after the vehicle begins to move. This sound do es not indicate
that a malfunction has occurred in Crawl Control system.
● Either of the following conditions may occur when the Crawl Con trol system
is operating. None of these indicates that a malfunction has occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard after the vehicle comes to a stop.
■ When there is a malfunction in the system
Warning lights and/or warning messages will turn on. ( P. 474, 484)
WARNING
■When using Crawl Control
● Do not overly rely on Crawl Control. This function does not ext end the
vehicle’s performance limitations. Always check the terrain tho roughly and
drive safely.
● The recommended speed modes for the listed terrains ( P. 311) are only
a reference. The selected mode may not be suitable to actual of f-road con-
ditions due to factors such as the type or unevenness of the te rrain or the
degree of incline. Check the actual terrain thoroughly and drive safely.
● After activating Crawl Control, make sure that the Crawl Contro l indicator
comes on. If the indicator flashes, the vehicle is not under system control.
■ Conditions under which the system may not operate correctly
When driving on the following surfaces, the system may not be a ble to
maintain a fixed low speed, which may result in an accident:
● Extremely steep inclines
● Extremely uneven surfaces
● Snow-covered roads, or other slippery surfaces