check engine TOYOTA SIENNA 2019 (in English) Service Manual

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SIENNA_OM_OM08025U_(U)
6-3. Do-it-yourself maintenance
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Maintenance and care
Checking and replacing fuses
Turn the engine switch to the “LOCK” position (vehicles without a
smart key system) or off (vehicles with a smart key system).
Open the fuse box cover.
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.
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Engine compartment type AEngine compartment type B
Push the tab in and lift the lid o ff. Push the tab in and lift the lid off.
Driver’s side instrument panel
Remove the lid.

SIENNA_OM_OM08025U_(U)
4496-3. Do-it-yourself maintenance
6
Maintenance and care
Install a new light bulb.
Align the 3 tabs on the light bulb
with the mounting and insert.
Turn clockwise and secure
the bulb base.
Install the connector.
Shake the connector gently to
check that it is not loose, turn
the fog lights on once and visu-
ally confirm that no light is leak-
ing through the mounting.
When installing the engine under cover, reverse the step .
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4737-2. Steps to take in an emergency
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When trouble arises
Slip indicatorIndicates a malfunction in:
• The VSC (Vehicle Stability Control) system;
• The TRAC (Traction Control) system; or
• The hill-start assist control system
The light will flash when the VSC or the TRAC system is
operating.
 Have the vehicle inspected by your Toyota dealer
immediately.
Low fuel level warning light
Indicates that remaining fuel is approximately 3.0 gal.
(11.4 L, 2.5 Imp.gal.) or less
 Refuel the vehicle.
Seat belt reminder light (warning buzzer)*3
Warns the driver and/or front passenger to fasten their
seat belts
 Fasten the seat belt.
If the front passenger’s seat is occupied, the front
passenger’s seat belt also needs to be fastened to
make the warning light (warning buzzer) turn off.
Low engine oil level warning light*2
Indicates that engine oil level is low (This warning light
may come on if the vehicle is stopped on a slope. Move
the vehicle to a level surface and check to see if the light
goes off.)
 Check the level of engine oil and add more oil if nec-
essary.
Master warning light
A buzzer sounds and the warning light comes on and
flashes to indicate that the master warning system has
detected a malfunction.
 P. 481
Warning lightWarning light/Details/Actions

4747-2. Steps to take in an emergency
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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

4777-2. Steps to take in an emergency
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When trouble arises
■When a tire is replaced with a spare tire (vehicles with compac t spare
tire)
The compact spare tire is not equipped with a tire pressure war ning valve
and transmitter. If a tire goes flat, the tire pressure warning light will not
turn off even though the flat tire has been replaced with the s pare tire.
Replace the spare tire with the repaired tire and adjust the ti re inflation
pressure. The tire pressure war ning light will go off after a few minutes.
■Conditions that the tire pressure warning system may not functi on
properly
 P. 4 2 5
■If the tire pressure warning light frequently comes on after bl inking
for 1 minute
If the tire pressure warning light frequently comes on after bl inking for 1
minute when the engine switch is turned to the “ON” position (v ehicles
without a smart key system) or IGNITION ON mode (vehicles with a
smart key system), have it checked by your Toyota dealer.
■ Customization that can be configured at Toyota dealer
The vehicle speed linked seat belt reminder buzzer can be disab led.
(Customizable features P. 547) However, Toyota recommends that the seat
belt reminder buzzer be operational to alert the driver and fro nt passenger
when seat belts are not fastened.
■ Warning buzzer
In some cases, the buzzer may not be heard because of noisy pla ce or an
audio sound.

4837-2. Steps to take in an emergency
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When trouble arises
■Warning messages
The warning messages explained below may differ from the actual messages
according to operation conditions and vehicle specifications.
■ If a message that indicates the need for contacting or visiting your TOY-
OTA dealer is shown
The system or part shown on the multi-information display is ma lfunctioning.
Have the vehicle inspected by your Toyota dealer.
■ If “Auto Power Off to Con serve Battery” is shown
Power was turned off due to the automatic power off function. N ext time when
starting the engine, increase the engine speed slightly and mai ntain that level
for approximately 5 minutes to recharge the battery.
■ If “Shift to P Before Exiting Vehicle” is shown
The driver’s door is opened without turning the engine switch t o off with the
shift lever in any position other than P. Shift the shift lever to P.
■ If “Front Camera Unavailable” or “Front Camera Unavailable Remove
Debris On Windshield” is shown
The following systems may be suspended until the problem shown in the
message is resolved.
● PCS (Pre-Collision system)
● LDA (Lane Departure Alert with steering control)
● Dynamic radar cruise control
● Automatic High Beam
■ If “AWD System Overheated 2WD Mode Engaged” or “AWD System
Overheated Switching To 2WD Mode” is shown
The Active Torque Control 4WD system has overheated. Immediatel y stop
the vehicle in a safe place and contact your Toyota dealer.
■ If “Low Engine Oil Add or Replace” is shown
The engine oil level is low. Check the level of engine oil, and add if necessary.
This message may appear if the vehicle is stopped on a slope. M ove the
vehicle to a level surface and check to see if the message disa ppears.
■ If “Maintenance Required Soon” is shown
The engine oil is scheduled to be changed. Check the engine oil, and change
if necessary. After changing the engine oil, the message should be reset.
( P. 398)

4847-2. Steps to take in an emergency
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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”

5047-2. Steps to take in an emergency
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■Stopping the engine
Shift the shift lever to P and press the engine switch as you normally do when
stopping the engine.
■ Replacing the key battery
As this above procedure is a temporary measure, it is recommended that the
electronic key battery be replaced immediately when the battery depletes.
( P. 436)
■ Alarm (if equipped)
Using the mechanical key to lock the doors will not set the ala rm system.
If a door is unlocked using the mechanical key when the alarm system is set,
the alarm may be triggered. ( P. 79)
■ Changing engine switch modes
Within 10 seconds of the buzzer sounding, release the brake ped al and press
the engine switch.
The engine does not start and modes will be changed each time t he switch is
pressed. ( P. 229)
■ When the electronic key does not work properly
●Check if the battery-saving mode is set. If it is set, cancel t he function.
( P. 145)
● Make sure that the smart key system has not been deactivated in the cus-
tomization setting. If it is off, turn the function on.
(Customizable features P. 544)

5067-2. Steps to take in an emergency
SIENNA_OM_OM08025U_(U)
Connect the jumper cables according to the following procedures:
Connect a positive jumper cable clamp to the positive (+) batte ry
terminal on your vehicle
Connect the clamp on the other end of the positive cable to the
positive (+) battery termi nal on the second vehicle
Connect a negative cable clamp to the negative (-) battery term i-
nal on the s econd vehicle
Connect the clamp at the other e nd of the negative cable to a
solid, stationary, unpainted meta llic point away from the battery
and any moving parts, as shown in the illustration.
Start the engine of the second v ehicle. Increase the engine speed
slightly and maintain at that lev el for approximately 5 minutes to
recharge the batter y of your vehicle.
Vehicles with a smart key system only: Open and close any of th e
doors of your vehicle wi th the engine switch off.
Maintain the engine speed of the second vehicle and start the
engine of your vehicle by turning the engine switch to the “ON”
position (vehicles without a smart key system) or turning the e ngine
switch to IGNITION ON mode (vehi cles with a smart key system).
Once the vehicle’s engine has st arted, remove the jumper cables in
the exact reverse order from which they were connected.
To install the engine cover, conduct the removal procedure in
reverse. After installing, check that the fixed pins are inserted
securely.
Once the engine starts, have the vehicle inspected at your Toyota
dealer as soon as possible.4
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5107-2. Steps to take in an emergency
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The coolant level is satisfactory if it is between the “FULL” and
“LOW” lines on the reservoir.
Reservoir
“FULL” line
“LOW” line
Radiator cap
Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
Start the engine and turn the ai r conditioning system on to check
that the radiator cooling fans operate and to check for coolant leaks
from the radiator or hoses.
The fans operate when the air conditioning system is turned on immedi-
ately after a cold start. Confirm that the fans are operating b y checking the
fan sound and air flow. If it is difficult to check these, turn the air condition-
ing system on and off repeatedly. (The fans may not operate in freezing
temperatures.)
If the fans are not operating:
Stop the engine immediately and contact your Toyota dealer.
If the fans are operating:
Have the vehicle ins pected at the nearest Toyota dealer.
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