maintenance TOYOTA 4RUNNER 2021 (in English) Repair Manual

4446-3. Do-it-yourself maintenance
4RUNNER (U)
Take out the mechanical key.
Remove the cover.
To prevent damage to the key,
cover the tip of the screwdriver with
a rag.
Remove the depleted battery.
Insert a new battery with the “+”
terminal facing up.
■Use a CR2016 (vehicles without a smart key system) or CR1632 (v ehicles
with a smart key system) lithium battery
● Batteries can be purchased at your Toyota dealer, local electri cal appliance
shops or camera stores.
● Replace only with the same or equivalent type recommended by the manu-
facturer.
● Dispose of used batteries according to local laws.
■ If the electronic key battery is depleted
The following symptoms may occur:
●The smart key system and wireless remote control will not funct ion properly.
● The operational range will be reduced.
Replacing the battery (vehic les with a smart key system)
1
2
3

4456-3. Do-it-yourself maintenance
6
Maintenance and care
4RUNNER (U)
WARNING
■Battery precautions
Observe the following precautions.
Failure to do so may result in death or serious injury.
● Do not swallow the battery. Doing so may cause chemical burns.
● A coin battery or button battery is used in the wireless remote control/elec-
tronic key. If a battery is swallowed, it may cause severe chem ical burns in
as little as 2 hours and may result in death or serious injury.
● Keep away new and removed batteries from children.
● If the cover cannot be firmly closed, stop using the wireless r emote con-
trol/electronic key and stow the key in the place where childre n cannot
reach, and then contact your Toyota dealer.
● If you accidentally swallow a battery or put a battery into a p art of your
body, get emergency medical attention immediately.
■ To prevent battery explosion or leakage of flammable liquid or gas
● Replace the battery with a new battery of the same type. If a w rong type of
battery is used, it may explode.
● Do not expose batteries to extremely low pressure due to high altitude or
extremely high temperatures.
● Do not burn, break or cut a battery.
NOTICE
■For normal operation after replacing the battery
Observe the following precautions to prevent accidents:
● Always work with dry hands.
Moisture may cause the battery to rust.
● Do not touch or move any other component inside the remote cont rol.
● Do not bend either of the battery terminals.

4466-3. Do-it-yourself maintenance
4RUNNER (U)
Turn the engine switch off.
Open the Fuse box cover.
Engine compartment
Push the tab in and lift the lid off.
Driver’s side instrument panel
Remove the lid.
Remove the fuse with the pull-
out tool.
Only type A fuse can be removed
using the pullout tool.
Checking and replacing fuses
If any of the electrical components do not operate, a fuse may
have blown. If this happens, che ck and replace the fuses as nec-
essary.
1
2
3

4476-3. Do-it-yourself maintenance
6
Maintenance and care
4RUNNER (U)
Check if the fuse is blown.Normal fuse
Blown fuse
Type A, B, C, D, E:
Replace the blown fuse with a new fuse of an appropriate ampera ge rat-
ing. The amperage rating can be found on the fuse box lid.
Type F:
Contact your Toyota dealer.
4
1
2
Ty p e AType B
Ty p e CType D
Ty p e EType F

4486-3. Do-it-yourself maintenance
4RUNNER (U)
■After a fuse is replaced
●If the lights do not turn on even after the fuse has been repla ced, a bulb may
need replacement. ( P. 449)
● If the replaced fuse blows again, have the vehicle inspected by your Toyota
dealer.
■ If there is an overload in a circuit
The fuses are designed to blow, protecting the wiring harness f rom damage.
WARNING
■To prevent system breakdowns and vehicle fire
Observe the following precautions.
Failure to do so may cause damage to the vehicle, and possibly a fire or
injury.
● Never use a fuse of a higher amperage rating than that indicate d, or use
any other object in place of a fuse.
● Always use a genuine Toyota fuse or equivalent.
Never replace a fuse with a wire, even as a temporary fix.
● Do not modify the fuses or fuse boxes.
NOTICE
■Before replacing fuses
Have the cause of electrical overload determined and repaired b y your
Toyota dealer as soon as possible.

4496-3. Do-it-yourself maintenance
6
Maintenance and care
4RUNNER (U)
Check the wattage of the light bulb to be replaced. ( P. 529)
Light bulbs
You may replace the following bulbs by yourself. The difficulty
level of replacement varies depending on the bulb. If necessary
bulb replacement seems diffic ult to perform, contact your
Toyota dealer.
For more information about replacing other light bulbs, contact
your Toyota dealer.
Preparing for light bulb replacement

4506-3. Do-it-yourself maintenance
4RUNNER (U)■
Front
■Rear
Bulb locations
Headlight high beam (if
equipped)/daytime running
light
Front turn signal/parking
light
Front side marker light1
2
3
Rear turn signal light
Back-up light
License plate light1
2
3

4516-3. Do-it-yourself maintenance
6
Maintenance and care
4RUNNER (U)■
Headlight high beam (if equi
pped)/daytime running lights
Turn the bulb base counter-
clockwise.
Pull the bulb out while press-
ing the lock release of the
connector.
Replace the light bulb, and
install the bulb base.
Align the 3 tabs on the light bulb
with the mounting and insert.
Turn and secure the bulb
base.
Shake the bulb base gently to
check that it is not loose, turn
the headlights on once and visu-
ally confirm that no light is leak-
ing through the mounting.
Replacing light bulbs
1
2
3
4

4526-3. Do-it-yourself maintenance
4RUNNER (U)■
Front turn signal/parking light
Turn the steering wheel in
the opposite direction of the
front turn signal light and
parking light that you wish to
replace.
For example, if you wish to
replace the front turn signal light
and parking light on the right
side, turn the steering wheel to
the left.
Remove the fender liner
screws.
Partly remove the fender
liner.
1
2
3

4536-3. Do-it-yourself maintenance
6
Maintenance and care
4RUNNER (U)
Turn the bulb base counter-
clockwise.
Remove the light bulb.
When installing, reverse the steps listed.4
5
6