wheel TOYOTA RAV4 PRIME 2021 (in English) Repair Manual
[x] Cancel search | Manufacturer: TOYOTA, Model Year: 2021, Model line: RAV4 PRIME, Model: TOYOTA RAV4 PRIME 2021Pages: 616, PDF Size: 34.66 MB
Page 332 of 616

3325-5. Using the driving support systems
Depending on the vehicle condition 
and road conditions, the warning 
may not operate. Also, if the system 
determines that the vehicle is driv-
ing around a curve, warnings will 
occur earlier than  during straight-
lane driving.
●When the system determines that 
the driver is driving without hold-
ing the steering wheel while the 
steering wheel assist of the steer-
ing assist function is operating.
If the driver continues to keep their 
hands off of the steering wheel and 
the steering wheel assist is operat-
ing, the buzzer sounds and the 
driver is warned. Each time the 
buzzer sounds, the continuing time 
of the buzzer becomes longer. 
The buzzer also sounds even if the 
alert type is set to “Steering wheel 
vibration”.
■Vehicle sway warning function
When the system de termines that 
the vehicle is swaying while the 
vehicle sway warning function is 
operating, a buzzer sounds and a 
warning message urging the driver 
to rest and the symbol shown in the 
illustration are sim ultaneously dis-
played on the multi-information dis-
play.
Depending on the vehicle and road 
conditions, the warning may not 
operate.
■Warning message
If the follo wing warning message is 
displayed on the multi-information  display and the LT
A indicator illumi-
nates in orange, follow the appropri-
ate troubleshooting procedure. Also, 
if a different warning message is 
displayed, follow the instructions 
displayed on the screen.
●“LTA Malfunction Visit Your 
Dealer”
The system may not be operating 
properly. Have the vehicle inspected 
by your Toyo ta dealer.
●“LTA Unavailable”
The system is temporarily canceled 
due to a malfunction in a sensor 
other than the front camera. Turn 
the LTA system off, wait for a little 
while, and then turn the LTA system 
back on.
●“LTA Unavailable at Current 
Speed”
The function cannot be used as the 
vehicle speed exceeds the LTA 
operation range. Drive slower.
■Customization
Function settings can be changed. 
(  P.177) 
Page 340 of 616

3405-5. Using the driving support systems
control continues to keep your vehicle stopped.
When the turn signal lever is operated and your vehicle moves to an over-
taking lane while driving at 50 mph (80 km/h) or more, the vehi cle will accel-
erate to help to overt ake a passing vehicle.
The system’s identifi cation of what is an overtaking lane may be deter-
mined solely based on  the location of the steering wheel in the  vehicle (left 
side driver position versus righ t side driver position.) If the vehicle is driven 
to a region where the overtaking lane is on a different side fr om where the 
vehicle is normally driven, the v ehicle may accelerate when the turn signal 
lever is operated in the opposite direction to the overtaking l ane (e.g., if the 
driver normally operates the vehicle in a region where the over taking lane is 
to the right but then drives to  a region where the overtaking l ane is to the 
left, the vehicle may accelerate  when the right turn signal is activated).
Example of acceleration
When there are no longer any preceding vehicles driving slower 
than the set speed
The system accelerates until the  set speed is reached. The system then 
returns to constan t speed cruising.
1Press the cruise control main 
switch to activate the cruise 
control.
Dynamic radar cruise control indi-
cator will come on  and a message 
will be displayed  on the multi-infor-
mation display. Press the switch 
again to deactivate the cruise con-
trol.
If the cruise cont rol main switch is 
pressed and held for 1.5 seconds 
or more, the syste m turns on in 
constant speed control mode.  (
 P.343)
2 Accelerate or decelerate, 
with accelerator pedal opera-
tion, to the desired vehicle 
speed (at or above approxi-
mately 20 mph [30 km/h]) 
and press the “-SET” switch 
to set the speed.
Cruise control “SET” indicator will 
come on.
The vehicle speed at the moment 
the switch is released becomes the 
C
Setting the vehicle speed 
(vehicle-to-vehicle dis-
tance control mode) 
Page 346 of 616

3465-5. Using the driving support systems
●Motorcycles traveling in the same 
lane
●When water or snow thrown up by 
the surrounding vehicles hinders 
the detecting of the sensor
●When your vehicle is pointing 
upwards (caused by a heavy load 
in the luggage compartment, etc.)
●Preceding vehicle has an 
extremely high ground clearance
■Conditions under which the 
vehicle-to-vehicle distance con-
trol mode may not function cor-
rectly
In the case of the following condi-
tions, operate the brake pedal (or 
accelerator pedal, depending on the 
situation) as necessary.
As the sensor may not be able to 
correctly detect vehicles ahead, the 
system may not operate properly.
●When the road curves or when the 
lanes are narrow
●When steering wheel operation or 
your position in the lane is unsta-
ble
●When the vehicle ahead of you 
decelerates suddenly
●When driving on a road sur-
rounded by a structure, such as in 
a tunnel or on a bridge
●While the vehicle speed is 
decreasing to the  set speed after 
the vehicle accelerates by 
depressing the accelerator pedal 
Page 379 of 616

3795-5. Using the driving support systems
5
Driving
Press the Trail Mode switch
When the switch is pressed, Trail 
Mode turns on and the Trail Mode 
indicator illuminates on the multi-
information display.
When the switch is pressed again, 
the Trail Mode indicator turns off.
■Trail Mode
●Trail Mode is intended for use 
when driving on bumpy rough 
roads. Do not turn the switch on in 
other situations.
●Trail Mode controls the vehicle so 
that it can use the maximum 
amount of drive force when driving 
on bumpy roads.
●If Trail Mode is continuously used 
for a long period of time, the load 
on related parts increases and the 
system may be unable to operate 
effectively.
■When Trail Mode is canceled
In the following situations, Trail 
Mode is automatically canceled 
even if it is turned on.
●When the driving mode is 
changed ( P.377)
●When the power switch is turned 
off
■During Trail Mode operation
The following types of situations 
may occur, but they are not mal-
functions.
●Vibrations may be felt throughout 
the vehicle or steering wheel
●Operating noise may be heard 
from the engine compartment
■When an inspection at your 
Toyota dealer is necessary
In the following situ ations, the sys-
tem may be malf unctioning. Have 
the vehicle insp ected by your 
Toyota dealer immediately.
Trail Mode
Trail Mode is a system that 
performs integrated control 
for the AWD, brake and 
drive force control systems 
to assist the drive power on 
bumpy roads, etc.
WARNING
■Before using Trail Mode
Make sure to observe the follow-
ing precautions. Failure to 
observe these precautions may 
result in an unexpected accident.
●Check that the Trail Mode indi-
cator is illumina ted before driv-
ing. Trail Mode will not operate 
when the indicator is off.
●Trail Mode is not intended to 
expand the limits of the vehicle. 
Thoroughly check the road con-
ditions and drive with caution.
●Thoroughly check the road con-
ditions before driving. As Trail 
Mode is suitable for driving on 
bumpy roads, such as those 
where the tire on one side 
spins, there is a chance that 
Trail Mode may not be the most 
appropriate for other road con-
ditions.
Turning Trail Mode on 
Page 380 of 616

3805-5. Using the driving support systems
●When the slip indicator light illumi-
nates while Trail Mode is on
●When the Trail Mode indicator 
does not illuminate even though 
the Trail Mode s witch is pressed
■ECB (Electronically Con-
trolled Brake System)
The electronically controlled 
system generates braking force 
corresponding to the brake 
operation
■ABS (Anti-lock Brake Sys-
tem)
Helps to prevent wheel lock 
when the brakes are applied 
suddenly, or if the brakes are 
applied while driving on a slip-
pery road surface
■Brake assist
Generates an increased level of 
braking force after the brake 
pedal is depressed when the 
system detects a panic stop sit-
uation
Driving assist systems
To keep driving safety and 
performance, the following 
systems operate automati-
cally in response to various 
driving situations. Be 
aware, however, that these 
systems are supplementary 
and should not be relied 
upon too heavily when oper-
ating the vehicle.
Summary of the driving 
assist systems 
Page 381 of 616

3815-5. Using the driving support systems
5
Driving
■VSC (Vehicle Stability Con-
trol)
Helps the driver to control skid-
ding when swerving suddenly or 
turning on slippery road sur-
faces.
■Enhanced VSC (Enhanced 
Vehicle Stability Control)
Provides cooperative control of 
the ABS, TRAC, VSC and EPS.
Helps to maintai n directional 
stability when swerving on slip-
pery road surfaces by con-
trolling steering performance.
■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)
Helps to maintain drive power 
and prevent the drive wheels 
from spinning when starting the 
vehicle or accelerating on slip-
pery roads
■Active Cornering Assist 
(ACA)
Helps to prevent the vehicle 
from drifting to the outer side by 
performing inner wheel brake 
control when attempting to 
accelerate while turning
■Hill-start assist control
Helps to reduce the backward  movement of the vehicle when 
starting on an uphill
■EPS (Electric Power Steer-
ing)
Employs an electric motor to 
reduce the amount of effort 
needed to turn the steering 
wheel
■E-Four (Electronic On-
Demand AWD system)
Automatically switches from 
front wheel drive to all-wheel 
drive (AWD) according to the 
driving conditions, helping to 
ensure reliable handling and 
stability. Examples of condi-
tions where the system will 
switch to AWD are when corner-
ing, going uphill, starting off or 
accelerating, and when the road 
surface is slippery due to snow, 
rain, etc.
■The Secondary Collision 
Brake
When the SRS airbag sensor 
detects a collision and the sys-
tem operates, the brakes and 
brake lights are automatically 
controlled to reduce the vehicle 
speed and help reduce the pos-
sibility of further damage due to 
a secondary collision.
■When the 
TRAC/VSC/ABS/T railer Sway 
Control systems  are operating
The slip indicator light will flash 
while the TRAC/VSC/ABS/Trailer 
Sway Control systems are operat-
ing. 
Page 382 of 616

3825-5. Using the driving support systems
■Disabling the TRAC system
If the vehicle gets stuck in mud, dirt 
or snow, the TRAC system may 
reduce power from the hybrid sys-
tem to the wheels.
Pressing   to turn the system off 
may make it easier  for you to rock 
the vehicle in order to free it.
To turn the TRAC system off, 
quickly press and release  .
“Traction Control Turned OFF” will 
be shown on the multi-information 
display.
Press   again to tu rn the system 
back on.
■Turning off the 
TRAC/VSC/Trailer Sway Con-
trol systems
To turn the TRAC/VSC/Trailer Sway 
Control systems off, press and hold 
 for more than 3 seconds while 
the vehicle is stopped.
The VSC OFF indicator light will 
come on and the “Traction Control 
Turned OFF” will be  shown on the 
multi-information display.
*
Press   again to tu rn the systems 
back on.
*: PCS will also be  disabled (only 
Pre-Collision warning is avail-
able). The PCS warning light will 
come on and a  message will be 
displayed on the multi-information 
display. ( P.322)
■When the message is dis-
played on the multi-information 
display showing that TRAC has 
been disabled even if   has 
not been pressed
TRAC is temporary deactivated. If 
the information continues to show, 
contact your Toyota dealer.
■Operating conditions of hill-
start assist control
When the following  four conditions 
are met, the hill-star t assist 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 fo llowing situations:
●The shift lever is shifted to P or N.
●The accelerator pedal is 
depressed.
●The parking brake is engaged.
●No more than 2 seconds have 
elapsed after the brake pedal is 
released.
■Sounds and vibrations caused 
by the ABS, brake assist, VSC, 
Trailer Sway Control, TRAC and 
hill-start assist control systems
●A sound may be heard from the 
engine compartment when the 
brake pedal is depressed repeat- 
Page 383 of 616

3835-5. Using the driving support systems
5
Driving
edly, when the hybrid system is 
started or just after 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 sys-
tems are 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 also  after the vehicle  comes to a stop.
■ECB operating sound
ECB operating sound may be heard 
in the following cases, but it does 
not indicate that a malfunction has 
occurred.
●Operating sound heard from the 
engine compartment when the 
brake pedal is operated.
●Motor sound of the brake system 
heard from the front part of the 
vehicle when the driver’ door is 
opened.
●Operating sound heard from the 
engine compartment when one or 
two minutes passed after the stop 
of the hybrid system.
■Active Cornering Assist opera-
tion sounds and vibrations
When the Active Cornering Assist is 
operated, operation sounds and 
vibrations may b e generated from 
the brake system, but this is not a 
malfunction.
■EPS operation sound
When the steering wheel is oper-
ated, a motor sou nd (whirring 
sound) may be heard. This does not 
indicate a malfunction.
■Automatic reactivation of 
TRAC, Trailer Sway Control and 
VSC systems
After turning the TRAC, Trailer 
Sway Control and VSC systems off, 
the systems will be  automatically re-
enabled in the following situations:
●When the power switch is turned 
off.
●If only the TRAC sy stem is turned 
off, the TRAC will turn on when 
vehicle speed increases.
If both the TRAC and VSC sys-
tems are turned of f, automatic re-
enabling will not occur when vehi-
cle speed increases.
■Operating conditions of Active 
Cornering Assist
The system operates when the fol-
lowing occurs.
●TRAC/VSC can operate
●The driver is attempting to accel-
erate while turning
●The system detects that the vehi-
cle is drifting to the outer side
●The brake pedal is released
■Reduced effectiveness of the 
EPS system
The effect iveness of the EPS sys-
tem is reduced to prevent the sys-
tem from overheating when there is 
frequent steering input over an 
extended period  of time. The steer-
ing wheel may feel heavy as a 
result. Should this  occur, refrain 
from excessive steering input or 
stop the vehicle a nd turn the hybrid 
system off. The EPS system should 
return to normal within 10 minutes.
■Secondary Collision Brake 
operating conditions
The system operates when the SRS 
airbag sensor de tects a collision 
while the vehicle is in motion. How-
ever, the system does not operate in 
any of the following situations.
●The vehicle speed is below 6 mph 
(10 km/h)
●Components are damaged
■Secondary Collision Brake 
automatic cancellation
The system is automatically can-
celed in any of th e following situa-
tions. 
Page 384 of 616

3845-5. Using the driving support systems
●The vehicle speed drops below 
approximately 6 mph (10 km/h)
●A certain amount of time elapses during operation●The accelerator pedal is 
depressed a large amount
■If a message about AWD is shown 
on the multi-information display
Perform the following actions.
MessageDetails/Actions
“AWD System Over- heated Switching to  2WD Mode”
AWD system is overheating.
Drive the vehicle at low speeds and stop the 
vehicle in a safe plac e with the hybrid sys-
tem operating until the  message is cleared.
Once the display message on the multi-informa-
tion display turns off, there is no problem continu-
ing to drive.
If the message does not disappear, have your 
vehicle checked by your Toyota dealer immedi-
ately.
“AWD System Over- heated 2WD Mode  Engaged”
The vehicle switched from all-wheel drive (AWD) 
to front wheel drive  due to overheating.
 Drive the vehicle at low speeds and stop the 
vehicle in a safe plac e with the hybrid sys-
tem operating until the  message is cleared.
Once the display message on the multi-informa-
tion display turns off, the AWD system returns to 
normal.
If the message does not disappear, have your 
vehicle checked by your Toyota dealer immedi-
ately.
“AWD System Malfunc- tion 2WD Mode 
Engaged Visit Your  Dealer”A malfunction occurred  in the AWD system.
 Have your vehicle checked by your Toyota 
dealer immediately.
WARNING
■The ABS does not operate 
effectively when
●The limits of tire gripping perfor-
mance have been exceeded 
(such as excessively worn tires 
on a snow covered road).
●The vehicle hydroplanes while 
driving at high speed on wet or 
slick roads. 
Page 386 of 616

3865-5. Using the driving support systems
WARNING
■Replacing tires
Make sure that all tires are of the 
specified size, brand, tread pat-
tern and total load capacity. In 
addition, make sure that the tires 
are inflated to the recommended 
tire inflation pressure level.
The ABS, TRAC and VSC/Trailer 
Sway Control  systems will not 
function correctly if different tires 
are installed on the vehicle.
Contact your Toyota dealer for 
further information when replacing 
tires or wheels.
■Handling of tires and the sus-
pension
Using tires with any kind of prob-
lem or modifying the suspension 
will affect the driving assist sys-
tems, and may cause a system to 
malfunction.
■Trailer Sway Control precau-
tion
The Trailer Sway Control system 
is not able to reduce trailer sway 
in all situations . Depending on 
many factors such as the condi-
tions of the vehicle, trailer, road 
surface and driving environment, 
the Trailer Sway  Control system 
may not be effective. Refer to 
your trailer owner’s manual for 
information on how to tow your 
trailer properly.
■If trailer sway occurs
Observe the following precau-
tions. 
Failing to do so may cause death 
or serious injury.
●Firmly grip the steering wheel. 
Steer straight ahead. Do not try 
to control trailer swaying by 
turning the steering wheel.
●Begin releasing the accelerator 
pedal immediately but very 
gradually to reduce speed.
Do not increase speed. Do not 
apply vehicle brakes.
If you make no extreme correction 
with the steering  or brakes, your 
vehicle and traile r should stabi-
lize. ( P.269)
■Secondary Collision Brake
Do not rely solely upon the Sec-
ondary Collision Brake. This sys-
tem is designed to help reduce 
the possibility of  further damage 
due to a secondary collision, how-
ever, that effect changes accord-
ing to various conditions. Overly 
relying on the system may result 
in death or serious injury.