2021 TOYOTA 4RUNNER ECU

4RUNNER (U)
Pictorial indexSearch by illustration
1For safety
and securityMake sure to read through them
2Instrument
clusterHow to read the gauges and meters, the variety of
warning lights and indicators, etc.
3
Operation of
each
componentOpening and closing the doors and windows,
adjustment before driving, etc.
4DrivingOperations and advice which are necessary for
driving
5Interior featuresUsage of the interior features, etc.
6Maintenance
and careCaring for your vehicle and maintenance
procedures
7When trouble
arisesWhat to do in case of malfunction or emergency
8Vehicle
specificationsVehicle specifications, customizable features, etc.
9For ownersReporting safety defects for U.S. owners, and seat
belt and SRS airbag instructions for Canadian
owners
IndexSearch by symptom
Search alphabetically

TABLE OF CONTENTS2
4RUNNER (U)For your information....................... 8
Reading this manual .................... 12
How to search .............................. 13
Pictorial index .............................. 14
1-1. For safe use
Before driving ...................... 26
For safe driving ................... 28
Seat belts ............................ 30
SRS airbags ........................ 35
Front passenger occupant classification system ......... 46
Safety information for children ........................ 52
Child restraint systems ........ 53
Installing child restraints ...... 57
Exhaust gas precautions ..... 69
1-2. Emergency assistance Safety Connect.................... 70
1-3. Theft deterrent system Engine immobilizer system............................... 76
Alarm ................................... 79
2. Instrument cluster Warning lights and indicators........................... 82
Gauges and meters............. 88
Multi-information display ..... 90 3-1. Key information
Keys................................... 102
Side doors ......................... 110
3-2. Opening, closing and locking the doors
Smart key system .............. 118
Automatic running boards ............................. 128
Back door .......................... 131
3-3. Adjusting the seats Front seats......................... 136
Rear seats ......................... 139
Driving position memory ........................... 149
Head restraints .................. 153
3-4. Adjusting the steering wheel and mirrors
Steering wheel ................... 156
Inside rear view mirror ....... 158
Outside rear view mirrors ............................. 160
3-5. Opening, closing the windows and
moon roof
Power windows.................. 162
Power back window ........... 166
Moon roof .......................... 170
1For safety and security
2Instrument cluster
3Operation of
each component

25
For safety and security1
4RUNNER (U)1-1. For safe use
Before driving ...................... 26
For safe driving ................... 28
Seat belts ............................ 30
SRS airbags ........................ 35
Front passenger occupant classification system ......... 46
Safety information for children ........................ 52
Child restraint systems........ 53
Installing child restraints...... 57
Exhaust gas precautions..... 69
1-2. Emergency assistance Safety Connect ................... 70
1-3. Theft deterrent system Engine immobilizer system .............................. 76
Alarm................................... 79

26
4RUNNER (U)
1-1. For safe use
Use only floor mats designed specifically for vehicles of the same
model and model year as your vehicle. Fix them securely in plac e
onto the carpet.
Insert the retaining hooks (clips)
into the floor mat eyelets.
Turn the upper knob of each
retaining hook (clip) to secure
the floor mats in place.
*: Always align the marks. The shape of the retaining hooks (clips) may differ from that s hown in the
illustration.
Before driving
Floor mat
1
*
O

271-1. For safe use
1
For safety and security
4RUNNER (U)
WARNING
Observe the following precautions.
Failure to do so may cause the driver’s floor mat to slip, possibly interfering
with the pedals while driving. An unexpectedly high speed may result or it may
become difficult to stop the vehicle. This could lead to an acc ident, resulting in
death or serious injury.
■ When installing the driver’s floor mat
● Do not use floor mats designed for other models or different mo del year
vehicles, even if they are Toyota Genuine floor mats.
● Only use floor mats designed for the driver’s seat.
● Always install the floor mat securely using the retaining hooks (clips) pro-
vided.
● Do not use two or more floor mats on top of each other.
● Do not place the floor mat bottom-side up or upside-down.
■ Before driving
● Check that the floor mat is securely
fixed in the correct place with all the
provided retaining hooks (clips). Be
especially careful to perform this check
after cleaning the floor.
● With the engine stopped and the shift
lever in P, fully depress each pedal to
the floor to make sure it does not inter-
fere with the floor mat.

291-1. For safe use
1
For safety and security
4RUNNER (U)
Make sure that you can see backward clearly by adjusting the inside
and outside rear view mirrors properly. (P. 158, 160)
Adjusting the mirrors
WARNING
Observe the following precautions.
Failure to do so may result in death or serious injury.
●Do not adjust the position of the driver’s seat while driving.
Doing so could cause the driver to lose control of the vehicle.
● Do not place a cushion between the driver or passenger and the seatback.
A cushion may prevent correct posture from being achieved, and reduce
the effectiveness of the seat belt and head restraint.
● Do not place anything under the front seats.
Objects placed under the front seats may become jammed in the s eat
tracks and stop the seat from locking in place. This may lead t o an acci-
dent and the adjustment mechanism may also be damaged.
● Always observe the legal speed limit when driving on public roads.
● When driving over long distances, take regular breaks before yo u start to
feel tired.
Also, if you feel tired or sleepy while driving, do not force y ourself to con-
tinue driving and take a break immediately.

311-1. For safe use
1
For safety and security
4RUNNER (U)
The pretensioners help the seat
belts to quickly restrain the occu-
pants by retracting the seat belts
when the vehicle is subjected to
certain types of severe frontal or
side collision or a vehicle rollover.
The pretensioners do not activate
in the event of a minor frontal
impact, a minor side impact or a
rear impact.
■Emergency locking retractor (ELR)
The retractor will lock the belt during a sudden stop or on imp act. It may also
lock if you lean forward too quickly. A slow, easy motion will allow the belt to
extend so that you can move around fully.
■ Automatic locking retractor (ALR)
When a passenger’s shoulder belt is completely extended and then retracted
even slightly, the belt is locked in that position and cannot be extended. This
feature is used to hold the child restraint system (CRS) firmly . To free the belt
again, fully retract the belt and then pull the belt out once m ore. (P. 57)
■ Child seat belt usage
The seat belts of your vehicle were principally designed for persons of adult
size.
●Use a child restraint system appropriate for the child, until the child
becomes large enough to properly wear the vehicle’s seat belt. ( P. 53)
● When the child becomes large enough to properly wear the vehicle’s seat
belt, follow the instructions regarding seat belt usage. ( P. 30)
■ Replacing the belt after the pr etensioner has been activated
If the vehicle is involved in multiple collisions, the pretensi oner will activate for
the first collision, but will not activate for the second or su bsequent collisions.
■ Seat belt extender
Seat belt pretensioners (front seats)
If your seat belts cannot be fastened
securely because they are not long
enough, a personalized seat belt extender
is available from your Toyota dealer free
of charge.

331-1. For safe use
1
For safety and security
4RUNNER (U)
WARNING
■People suffering illness
Obtain medical advice and wear the seat belt in the proper way. (P. 30)
■ When children are in the vehicle
Do not allow children to play with the seat belt. If the seat belt becomes
twisted around a child’s neck, it may lead to choking or other serious injuries
that could result in death.
If this occurs and the buckle cannot be unfastened, scissors sh ould be used
to cut the belt.
■ Seat belt pretensioners
● Do not place anything, such as a cushion, on the front passenge r's seat.
Doing so will disperse the passenger's weight, which prevents t he sensor
from detecting the passenger's weight properly. As a result, th e seat belt
pretensioner for the front passenger's seat may not activate in the event of
a collision.
● If the pretensioner has activated, the SRS warning light will c ome on. In
that case, the seat belt cannot be used again and must be replaced at
your Toyota dealer.
■ Adjustable shoulder anchor
Always make sure the shoulder belt is positioned across the cen ter of your
shoulder. The belt should be kept away from your neck, but not falling off
your shoulder. Failure to do so could reduce the amount of prot ection in an
accident and cause death or serious injuries in the event of a sudden stop,
sudden swerve or accident. ( P. 30)