2021 TOYOTA HILUX warning light

4977-3. Do-it-yourself maintenance
HILUX_OM_OM0K513E_(EE)
7
Maintenance and care
WARNING
QChemicals in the battery
Batteries contain poisonous and corrosive sulfuric acid and may produce
hydrogen gas which is flammable and explosive. To reduce the risk of death
or serious injury, take the following precautions while working on or near the
battery:
O Do not cause sparks by touching the battery terminals with tools.
O Do not smoke or light a match near the battery.
O Avoid contact with eyes, skin and clothes.
O Never inhale or swallow electrolyte.
O Wear protective safety glasses when working near the battery.
O Keep children away from the battery.
Q Where to safely charge the battery
Always charge the battery in an open area. Do not charge the battery in a
garage or closed room w here there is insufficient ventilation.
Q How to recharge the battery (vehicles with maintenance-free type bat-
tery)
Only perform a slow charge (5 A or less). The battery may explode if
charged at a quicker rate.
Q Emergency measures regarding electrolyte
O If electrolyte gets in your eyes
Flush your eyes with clean water for at least 15 minutes and get immedi-
ate medical attention. If possible, continue to apply water with a sponge or
cloth while traveling to the nearest medical facility.
O If electrolyte gets on your skin
Wash the affected area thoroughly. If you feel pain or burning, get medical
attention immediately.
O If electrolyte gets on your clothes
It can soak through clothing on to your skin. Immediately take off the cloth-
ing and follow the procedure above if necessary.
O If you accidentally swallow electrolyte
Drink a large quantity of water or milk. Get emergency medical attention
immediately.
O When there is insufficient battery fluid
Do not use if there is insufficient fluid in the battery. There is a possible
danger that the battery may explode.
Q When disconnecting the battery
Do not disconnect the negative (-) terminal on the body. The disconnected
negative (-) terminal may touch the positive (+) terminal, which may cause a
short and result in death or serious injury.

4997-3. Do-it-yourself maintenance
HILUX_OM_OM0K513E_(EE)
7
Maintenance and care
You may drain the fuel filter yourself. However, as the operation is dif-
ficult, we recommend having it drained by any authorized Toyota
retailer or Toyota authorized repairer, or any reliable repairer. Even if
you decide to drain it yourself, contact any authorized Toyota retailer
or Toyota authorized repairer, or any reliable repairer.
The water in the fuel filter needs to be drained if one of the following
symptoms occurs:
Vehicles without multi-information display
When the fuel system warning light flashes and a buzzer sounds.
( P. 569)
Vehicles with multi-information display
When “Water accumulation in fuel filter See owner’s manual” is
shown on the multi-information display and a buzzer sounds*1.
Vehicles without smart entry & start system: Turn the engine switch
to the “LOCK” position.
Vehicles with smart entry & start system: Turn the engine switch off.
Place a small tray under the drain plug or drain hose to catch the
water and any fuel that comes out.
Perform the draining as shown in the illustration.
Turn the drain plug counter-
clockwise about 2 to 2 1/2
turns.
Loosening more than this will
cause water oozing from around
the drain plug.
Operate the priming pump
until fuel begins to run out.
After draining, tighten the drain plug by hand.
*1: Models for model code destination Blank*2
*2: See “Checking your vehicle’s model” if you are not sure of which model
your vehicle is. ( P. 1 2 )
Fuel filter (diesel engine only)
1
2
3
1
2
4

5017-3. Do-it-yourself maintenance
HILUX_OM_OM0K513E_(EE)
7
Maintenance and care
QAdBlue™ warning light and warning message
When the AdBlue™ level is low,
the low AdBlue™ level warning
light turns on and a warning
message appears on the multi-
information display. ( P. 502)
When the possible driving range
based on the remaining amount
of AdBlue™ reaches approxi-
mately 2400 km (1492 miles),
the low AdBlue™ level warning
light turns on and a warning
message is displayed.
When refilling AdBlue™ by yourself in an emergency, be sure to follow
the correct refilling procedures. ( P. 503)

5027-3. Do-it-yourself maintenance
HILUX_OM_OM0K513E_(EE)
QWarning message
If the following warning message is displayed on the multi-information dis-
play, follow the appropriate troubleshooting procedure.
*1: Use the driving range as a reference. The possible driving range that is dis-
played may differ from the actual driving range depending on the refill
method, driving conditions and driving environment. ( P. 5 0 0 )
*2: The master warning light turns on and the buzzer sounds in accordance
with the warning message.
Q AdBlue™ gauge
The quantity of AdBlue™ remaining in the tank is displayed on the multi-infor-
mation display. ( P. 1 3 7 )
Warning messageDetails/Actions
“AdBlue Level Low Fill up
AdBlue in 2400 km See
Owner’s Manual”*1
When AdBlue™ needs to be refilled
 Have AdBlue™ refilled at any autho-
rized Toyota retailer or Toyota autho-
rized repairer, or any reliable repairer.
“AdBlue level Low No start in
800 km Top up AdBlue See
Owner’s Manual”*1, 2
When AdBlue™ needs to be refilled
If the displayed driving distance is
exceeded, the engine cannot be
restarted.
 Have AdBlue™ refilled at any autho-
rized Toyota retailer or Toyota autho-
rized repairer, or any reliable repairer
immediately.
“AdBlue empty Unable to
Restart Engine Fill up AdBlue
See Owner’s Manual”*2
When AdBlue™ needs to be refilled
 If the engine is stopped, it cannot be
restarted.
Without stopping the engine, contact
any authorized Toyota retailer or
Toyota authorized repairer, or any
reliable repairer immediately.
NOTICE
Q When the AdBlue™ level is low
When AdBlue™ is depleted, the engine cannot be restarted.
Be sure to have AdBlue™ refilled at any authorized Toyota retailer or Toyota
authorized repairer, or any reliable repairer before it is completely depleted.

5247-3. Do-it-yourself maintenance
HILUX_OM_OM0K513E_(EE)
QAfter a fuse is replaced
O If the lights do not turn on even after the fuse has been replaced, a bulb may
need replacement. ( P. 525)
O If the replaced fuse blows again, have the vehicle inspected by any autho-
rized Toyota retailer or Toyota authorized repairer, or any reliable repairer.
Q If there is an overload in a circuit
The fuses are designed to blow, protecting the wiring harness from damage.
WARNING
Q 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.
O Never use a fuse of a higher amperage rating than that indicated, or use
any other object in place of a fuse.
O Always use a genuine Toyota fuse or equivalent.
Never replace a fuse with a wire, even as a temporary fix.
O Do not modify the fuses or fuse boxes.
NOTICE
QBefore replacing fuses
Have the cause of electrical overload determined and repaired by any
authorized Toyota retailer or Toyota authorized repairer, or any reliable
repairer as soon as possible.

5517-3. Do-it-yourself maintenance
HILUX_OM_OM0K513E_(EE)
7
Maintenance and care
WARNING
QReplacing light bulbs
O Turn off the lights. Do not attempt to replace the bulb immediately after
turning off the lights.
The bulbs become very hot and may cause burns.
O Do not touch the glass portion of the light bulb with bare hands. When it is
unavoidable to hold the glass portion, use and hold with a clean dry cloth
to avoid getting moisture and oils on the bulb.
Also, if the bulb is scratched or dropped, it may blow out or crack.
O Fully install light bulbs and any parts used to secure them. Failure to do so
may result in heat damage, fire, or water entering the headlight unit. This
may damage the headlights or cause condensation to build up on the lens.
O Do not attempt to repair or disassemble light bulbs, connectors, electric
circuits or component parts.
Doing so may result in death or serious injury due to electric shock.
Q To prevent damage or fire
O Make sure bulbs are fully seated and locked.
O Check the wattage of the bulb before installing to prevent heat damage.
NOTICE
QWhen replacing the outer foot lights
If the front window is stopping you from conducting the replace operation
properly, open the window on the side you are working on to allow you
enough space to work. Continuing the operation without giving yourself
enough space to work could lead you to scratch the vehicle.

553
8When trouble arises
HILUX_OM_OM0K513E_(EE)
8-1. Essential information
Emergency flashers ........... 554
If your vehicle has to
be stopped in an
emergency ....................... 555
If the vehicle is
submerged or water on
the road is rising .............. 557
8-2. Steps to take in an
emergency
If your vehicle needs
to be towed ...................... 559
If you think something is
wrong ............................... 564
Fuel pump shut off
system (gasoline engine
only) ................................. 565
If a warning light turns on
or a warning buzzer
sounds ............................. 566
If a warning message is
displayed ......................... 575
If you have a flat tire .......... 581
If the engine will not
start.................................. 598
If the electronic key does
not operate properly
(vehicles with smart
entry & start system)........ 600
If the vehicle battery is
discharged ....................... 604
If your vehicle
overheats ......................... 610
If you run out of fuel
and the engine stalls
(diesel engine only) ......... 614
If the vehicle becomes
stuck ................................ 615

5668-2. Steps to take in an emergency
HILUX_OM_OM0K513E_(EE)
If a war ning light tur ns on or a warning
buzzer sounds
Calmly perform the following actions if any of the warning lights
comes on or flashes. If a light comes on or flashes, but then
goes off, this does not necessarily indicate a malfunction in the
system. However, if this continues to occur, have the vehicle
inspected by any authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer.
Warning light and warning buzzer list
Warning lightWarning light/Details/Actions
Brake system warning light (warning buzzer)
Indicates:
• Low brake fluid
• Malfunction in the brake system
• Low negative pressure in the vacuum tank (diesel
engine)
 Immediately stop the vehicle in a safe place and con-
tact any authorized Toyota retailer or Toyota autho-
rized repairer, or any reliable repairer. Continuing to
drive the vehicle may be dangerous.
Charging system warning light*1 (if equipped)
Indicates a malfunction in the vehicle’s charging system
 Immediately stop the vehicle in a safe place and con-
tact any authorized Toyota retailer or Toyota autho-
rized repairer, or any reliable repairer.
Low engine oil pressure warning light (warning
buzzer)*1, 2 (if equipped)
Indicates that the engine oil pressure is too low (This
warning light may come on if the vehicle is stopped on a
slope. Move to a level surface and check to see if the light
goes off.)
 Immediately stop the vehicle in a safe place and con-
tact any authorized Toyota retailer or Toyota autho-
rized repairer, or any reliable repairer.