2023 TOYOTA HIGHLANDER wiring

3736-1. Maintenance and care
6
Maintenance and care
Remove dirt and dust using a
vacuum cleaner. Wipe dirty
surfaces with a cloth damp-
ened with lukewarm water.
 If dirt cannot be removed,
wipe it off with a soft cloth
dampened with neutral deter-
gent diluted to approximately
1%.
Wring out any excess water
from the cloth and thoroughly
wipe off remaining traces of
detergent and water.
■Shampooing the carpets
There are several commercial foam-
ing-type cleaners available. Use a
sponge or brush to apply the foam.
Rub in overlapping circles. Do not
use water. Wipe dirty surfaces and
let them dry. Excellent results are
obtained by keeping the carpet as
dry as possible.
■Handling the seat belts
Clean with mild soap and lukewarm
water using a cloth or sponge. Also
check the belts periodically for
excessive wear, fraying or cuts.
Cleaning and protect-
ing the vehicle interior
Perform cleaning in a man-
ner appropriate to each
component and its material.
Protecting the vehicle
interior
WARNING
■Water in the vehicle
●Do not splash or spill liquid in
the vehicle.
Doing so may cause electrical
components, etc. to malfunc-
tion or catch fire.
●Do not get any of the SRS com-
ponents or wiring in the vehicle
interior wet.
(  P. 3 4 )
An electrical ma lfunction may
cause the airbags to deploy or
not function properly, resulting
in death or serious injury.
●Vehicles with wireless charger:
Do not let the wireless charger
(  P.350) get wet. Failure to do
so may cause t he charger to
become hot and cause burns or
could cause electric shock
resulting in death or serious
injury.
■Cleaning the interior (espe-
cially instrument panel)
Do not use polish wax or polish
cleaner. The instrument panel
may reflect off the windshield,
obstructing the driver’s view and
leading to an accident, resulting in
death or serious injury.
NOTICE
■Cleaning detergents
●Do not use the following types
of detergent, as they may dis-
color the vehicle interior or
cause streaks or damage to
painted surfaces:
• Non-seat portions: Organic sub- stances such as benzene or
gasoline, alkaline or acidic solu-
tions, dye, and bleach
• Seats: Alkaline or acidic solu- tions, such as th inner, benzene,
and alcohol

4136-3. Do-it-yourself maintenance
6
Maintenance and care
Normal fuse
Blown fuse
Type BNormal fuse
Blown fuse
Type CNormal fuse
Blown fuse
■After a fuse is replaced
●If the lights do n ot turn on even
after the fuse has been replaced,
a bulb may need replacement.
(  P.415)
●If the replaced fuse blows again,
have the vehicle inspected by
your Toyota dealer.
■If there is an overload in a cir-
cuit
The fuses are designed to blow, pro-
tecting the wiring harness from
damage.
■When replacing light bulbs
Toyota recommends that you use
genuine Toyota pr oducts designed
for this vehicle. Because certain
bulbs are connected to circuits
designed to prevent overload,
non-genuine parts or parts not
designed for this vehicle may be
unusable.
WARNING
■To prevent system break-
downs and vehicle fire
Observe the following precau-
tions.
Failure to do so may cause dam-
age to the vehicle, and possibly a
fire or injury.
●Never use a fuse of a higher
amperage rating than that indi-
cated, 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 over-
load determined and repaired by
your Toyota dealer as soon as
possible.

4397-2. Steps to take in an emergency
7
When trouble arises
ger detection sensor may cause
the warning light to flash and the
warning buzzer to sound even if a
passenger is not sitting in the
seat.
●If a cushion is placed on the seat,
the sensor may not detect a pas-
senger, and the warning light may
not operate properly.
■SRS warning light
This warning light system monitors
the airbag sensor assembly, front
impact sensors, side impact sensors
(front), side impact sensors (front
door), side impact sensors (rear),
driver’s seat position sensor,
driver’s seat belt buckle switch, front
passenger occupant classification
system (ECU and sensors), “PASS
AIR BAG ON” indicator light, “PASS
AIR BAG OFF” indicator light, front
passenger’s seat belt buckle switch,
driver’s seat belt pretensioner, front
passenger’s seat be lt pretensioner
and force limiter, airbags, intercon-
necting wiring and power sources.
(  P.34)
■If the malfunction indicator
lamp comes on while driving
First check the following:
●Is the fuel t ank empty?
If it is, fill the f uel tank immediately.
●Is the fuel tank cap loose?
If it is, tighten it securely.
The light will go o ff after several
driving trips.
If the light does not go off even after
several trips, contact your Toyota
dealer as soon as possible.
■Electric power steering system
warning light (warning buzzer)
When the battery charge becomes
insufficient or the voltage temporar-
ily drops, the electric power steering
system warning light may come on
and the warning buzzer may sound.
■When the tire pressure warning
light comes on
Inspect the tires to check if a tire is
punctured.
If a tire is punctured: P. 4 4 6
If none of the tires are punctured:
Turn the engine switch off then turn
it to ON. Check if the tire pressure
warning light com es on or blinks.
If the tire pressure warning light
blinks for 1 minute then stays on
There may be a malfunction in the
tire pressure warning system. Have
the vehicle inspected by your Toyota
dealer immediately.
If the tire pressur e warning light
comes on
1 After the temperature of the tires
has lowered sufficiently, check
the inflation pressure of each tire
and adjust them to the specified
level.
2 If the warning light does not turn
off even after several minutes
have elapsed, check that the
inflation pressure of each tire is
at the specified level and perform
initialization. ( P.399)
If the warning light d oes not turn off
several minutes af ter the initializa-
tion has been performed, have the
vehicle inspected by your Toyota
dealer immediately.
■The tire pressure warning light
may come on due to natural
causes
The tire pressure warning light may
come on due to natural causes such
as natural air leaks and tire inflation
pressure changes caused by tem-
perature. In this ca se, adjusting the
tire inflation pressure will turn off the
warning ligh t (after a few minutes).
■When a tire is replaced with a
spare tire
Vehicles with a co mpact spare tire:
The compact spare tire is not
equipped with a tire pressure warn-
ing valve and tran smitter. If a tire