coolant temperature TOYOTA SIENNA 2018 Owners Manual (in English)

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2. Instrument cluster
*1: These lights turn on when the engine switch is turned to the “ON” position
(vehicles without a smart key system) or IGNITION ON mode (vehicles
with a smart key system) to indicate that a system check is being per-
formed. They will turn off after the engine is started, or after a few seconds.
There may be a malfunction in a system if a light does not come on, or if
the lights do not turn off. Have the vehicle inspected by your Toyota dealer.
*2: The light comes on or flashes to indicate a malfunction.
*3: This light illuminates on the multi-information display.
*4: If equipped
The indicators inform the driver of the operating state of the vehicle’s
various systems.
*3Brake Override System
warning light ( P. 474)*3High coolant
temperature warning
light (P. 474)
Indicators
Turn signal indicator
(P. 239)*2Cruise control indicator
(P. 289)
(U.S.A.)
Headlight indicator
(P. 241)*2Dynamic radar cruise
control indicator
(P. 289)
(Canada)
Tail light indicator
(P. 241)*2Cruise control “SET”
indicator ( P. 289)
Headlight high beam
indicator ( P. 242)
*2
(White)
LDA indicator ( P. 279)
Automatic High Beam
indicator ( P. 246)
*2
(Green)
LDA indicator ( P. 279)
*1Fog light indicator
(P. 251)*2, 4
(Amber)
LDA indicator ( P. 279)

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2. Instrument cluster
Tachometer
Displays the engine speed in revolutions per minute
Multi-information display
Presents the driver with a variety of driving-related data (P. 92)
Speedometer
Displays the vehicle speed
Fuel gauge
Displays the quantity of fuel remaining in the tank
Odometer/trip meter display change button
Outside temperature
P. 9 1
Odometer and trip meter display
Odometer:
Displays the total distance that the vehicle has been driven
Trip meter:
Displays the distance the vehicle has been driven since the meter was last
reset. Trip meters “A” and “B” can be used to record and display different
distances independently.
Shift position and range
P. 233
Meter panel lights control button
P. 9 1
Engine coolant temperature gauge
Displays the engine coolant temperature
Pressing this button switches
among the odometer, trip meter
“A” and trip meter “B” displays.
When the trip meter is displayed,
pressing and holding the button
will reset the trip meter.
Changing the trip meter display
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SIENNA_OM_OM08019U_(U)
912. Instrument cluster
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Instrument cluster
The brightness of the meter panel lights can be adjusted.
Pressing the butto n will adjust the
brightness of the meter panel
lights.
The brightness level of the meters
when the surroundings are bright
(day mode) and dark (night mode)
can be adjusted individually. How-
ever, when in day mode, adjusting
the brightness level will also
change the brightness level of
night mode.
■ Outside temperature display
●In the following situations, the correct outside temperature ma y not be dis-
played, or the display may take longer than normal to change.
• When stopped, or driving at low speeds (less than 12 mph [20 k m/h])
• When the outside temperature has changed suddenly (at the entr ance/
exit of a garage, tunnel, etc.)
● The temperature range that can be displayed is from -40°F (-40° C) to 122°F
(50°C).
When the outside temperature drops below 37°F (3°C), the Low ou tside
temperature indicator will be displayed on the multi-informatio n display.
( P. 86)
● When “--” or “E” is displayed, the system may be malfunctioning. Take your
vehicle to your Toyota dealer.
Meter panel light control
NOTICE
■To prevent damage to the engine and its components
● Do not let the indicator needle of the tachometer enter the red zone, which
indicates the maximum engine speed.
● The engine may be overheating if the engine coolant temperature gauge is
in the red zone (H). In this case, immediately stop the vehicle in a safe
place, and check the engine after it has cooled completely. ( P. 509)

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2194-1. Before driving
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Driving
●Due to the added load of the trailer, your vehicle’s engine may over-
heat on hot days (at temperatures over 85°F [30°C]) when drivin g
up a long or steep grade. If the Engine coolant temperature gau ge
overheating, immediately turn off the air conditioning (if in use), pull
your vehicle off the road an d stop in a safe spot. (P. 509)
● Always place wheel blocks under both the vehicle’s and the trai ler’s
wheels when parking. Apply the parking brake firmly, and put th e
transmission in P. Avoid parking on a slope, but if unavoidable , do
so only after perform ing the following:
Apply the brakes and keep them applied.
Have someone place wheel blocks under both the vehicle’s and
trailer’s wheels.
When the wheel blocks are in pl ace, release the brakes slowly
until the blocks absorb the load.
Apply the parking brake firmly.
Shift into P and turn off the engine.
● When restarting afte r parking on a slope:
With the transmission in P, start the engine. Be sure to keep t he
brake pedal pressed.
Shift into a forward gear. If reversing, shift into R.
Release the parking brake and brake pedal, and slowly pull or
back away from the wheel bloc ks. Stop and apply the brakes.
Have someone retrieve the blocks.
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6-3. Do-it-yourself maintenance
WARNING
The engine compartment contains many mechanisms and fluids that may
move suddenly, become hot, or become electrically energized. To avoid death
or serious injury, observe the following precautions:
■When working on the engine compartment:
● Keep hands, clothing and tools away from the moving fan and eng ine
drive belt.
● Be careful not to touch the engine, radiator, exhaust manifold, etc. right
after driving as they may be hot. Oil and other fluids may also be hot.
● Do not leave anything that may burn easily, such as paper and r ags, in the
engine compartment.
● Do not smoke, cause sparks or expose an open flame to fuel or t he bat-
tery. Fuel and battery fumes are flammable.
● Be extremely cautious when working on the battery. It contains poisonous
and corrosive sulfuric acid.
■ When working near the electric cooling fans or radiator grille
Be sure the engine switch is in the “LOCK” position (vehicles without a
smart key system) or off (vehicles with a smart key system). With the engine
switch in the “ON” position (vehicles without a smart key system) or IGNI-
TION ON mode (vehicles with a smart key system), the electric cooling fans
may automatically start to run if the air conditioning is on an d/or the coolant
temperature is high. ( P. 415)
■ Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc.
from getting in your eyes.
NOTICE
■If you remove the air cleaner filter
Driving with the air cleaner filter removed may cause excessive engine wear
due to dirt in the air.

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6-3. Do-it-yourself maintenance
■Coolant selection
Only use “Toyota Super Long Life Coolant” or similar high quali ty ethylene
glycol based non-silicate, non-amine, non-nitrite, and non-bora te coolant with
long-life hybrid organic acid technology.
U.S.A.:
“Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50% deion-
ized water.
(Minimum temperature: -31 F [-35C])
Canada:
“Toyota Super Long Life Coolant” is a mixture of 55% coolant and 45% deion-
ized water.
(Minimum temperature: -44 F [-42C])
For more details about engine coolant, contact your Toyota deal er.
■ If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine coolant reservoir ca ps, radiator
cap, drain cock and water pump.
If you cannot find a leak, have your Toyota dealer test the cap and check for
leaks in the cooling system.
WARNING
■ When the engine is hot
Do not remove the radiator/engine coolant reservoir cap.
The cooling system may be under pressure and may spray hot coolant if the
cap is removed, causing serious injuries, such as burns.
NOTICE
■When adding coolant
Coolant is neither plain water nor straight antifreeze. The cor rect mixture of
water and antifreeze must be used to provide proper lubrication , corrosion
protection and cooling. Be sure to read the antifreeze or coolant label.
■ If you spill coolant
Be sure to wash it off with water to prevent it from damaging p arts or paint.

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7-2. Steps to take in an emergency
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When trouble arises
If you think something is wrong
●Fluid leaks un der the vehicle
(Water dripping from the air conditioning a fter use is normal.)
● Flat-looking tires or uneven tire wear
● Engine coolant temperature gauge needle continually points high er
than normal
● Changes in exhaust sound
● Excessive tire squeal when cornering
● Strange noises related to the suspension system
● Pinging or other noises related to the engine
● Engine missing, stumbling or running rough
● Appreciable loss of power
● Vehicle pulls heavily to one side when braking
● Vehicle pulls heavily to one s ide when driving on a level road
● Loss of brake effectiveness, spongy feeling, pedal almost touch es
the floor
If you notice any of the followi ng symptoms, your vehicle proba -
bly needs adjustment or repair. Contact your Toyota dealer as
soon as possible.
Visible symptoms
Audible symptoms
Operational symptoms

4747-2. Steps to take in an emergency
SIENNA_OM_OM08019U_(U)
Tire pressure warning lightWhen the light comes on:
Low tire inflation pressure such as
• Natural causes ( P. 4 7 6 )
• Flat tire ( P. 485, 499)
 Adjust the tire inflation pressure to the specified
level.
The light will turn off after a few minutes. In case
the light does not turn off even if the tire inflation
pressure is adjusted, have the system checked by
your Toyota dealer.
When the light comes on after blinking for 1 minute:
Malfunction in t he tire pressure warning system
(  P. 4 7 7 )
 Have the system checked by your Toyota dealer.
Low windshield washer fluid level warning light*2
Indicates that the windshield washer fluid level is too
low.
 Add washer fluid.
Third seat warning light*4
Indicates that the third seat operation is not yet complete.
 Complete the third seat operation ( P. 159)
Brake Override System warning light*2
Indicates that the accelerator and brake pedals are being
depressed simultaneously, and the Brake Override Sys-
tem is operating.
 Release the accelerator pedal and depress the brake
pedal.
Indicates a malfunction in the Brake Override System
(with warning buzzer)
 Have the vehicle inspected by your Toyota dealer
immediately.
High coolant temperature warning light (warning
buzzer)
*2
Changes from a flashing to a solid light when the engine
coolant temperature increases
 Stop and check. ( P. 509)
Warning lightWarning light/Details/Actions

4847-2. Steps to take in an emergency
SIENNA_OM_OM08019U_(U)■
If “Engine Coolant Temp is High” is shown
The engine coolant temperature is too high. Following the instr uctions,
accordingly. ( P. 509)
■ If “Clean Park Sonar” is shown
The intuitive parking assist is dirty or covered with ice. Clean the sensor.
■ The messages that need for cont acting your Toyota dealer
● If any of the following messages is shown on the multi-informat ion display, it
may indicate a malfunction. Have the vehicle inspected by your To y o t a
dealer immediately.
• “Check Park Sonar System”
• “Check Vehicle Stability Control System”
• “Check Steering Lock System”
● If any of the following messages is shown on the multi-informat ion display, it
may indicate a malfunction. Immediately stop the vehicle and contact your
Toyota dealer.
• “Check Charging System”
• “Low Oil Pressure”
• “Check Brake System”

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7-2. Steps to take in an emergency
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When trouble arises
If your vehicle overheats
Stop the vehicle in a safe place and turn off the air conditioning sys-
tem, and then stop the engine.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the engine has cooled down sufficiently, inspect the hoses and
radiator core (radiat or) for any leaks.
Radiator
Cooling fans
If a large amount of coolant
leaks, immediately contact your
Toyota dealer.
The following may indicate that your vehicle is overheating.
● The needle of the engine c oolant temperature gauge (P. 90)
enters the red zone or a loss of engine power is experienced. ( For
example, the vehicle s peed does not increase.)
● “Engine Coolant Temp is High” is shown on the multi-information
display.
● Steam is coming from under the hood.
Correction procedures
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