Page 729 of 872
729
4-3. Do-it-yourself maintenance
4
Maintenance and care
SIENNA_OM_OM45483U_(U)
■
Rear turn signal lights
Remove the securing bolts and
remove the unit.
Turn the bulb base counterclock-
wise.
Remove the light bulb.
STEP1
STEP2
Gasket
STEP3
Page 730 of 872
730 4-3. Do-it-yourself maintenance
SIENNA_OM_OM45483U_(U)■
Tail and back-up lights
Remove the back door trim
board.
Turn the bulb base counterclock-
wise.
Tail light
Back-up light
Remove the light bulb. Tail light
Back-up light
STEP1
STEP2
STEP3
Page 731 of 872
731
4-3. Do-it-yourself maintenance
4
Maintenance and care
SIENNA_OM_OM45483U_(U)
■
License plate lights
Remove the back door trim
board.
Turn the bulb base counterclock-
wise.
Remove the light bulb.
STEP1
STEP2
STEP3
Page 732 of 872

732 4-3. Do-it-yourself maintenance
SIENNA_OM_OM45483U_(U)■
Lights other than the above
If any of the lights listed below has burnt out, have it replaced by
your Toyota dealer.
● Headlight low beams (discharge bulbs)
● High mounted stoplight
● Side turn signal light (if equipped)
● Stop/tail and rear side marker lights
● Outer foot lights (if equipped)
■Discharge headligh ts (if equipped)
If voltage to the discharge bulbs is insufficient, the bulbs may not come on,
or may go out temporarily. The discharge bulbs will come on when normal
power is restored.
■ LED lights
The stop/tail, side turn signal light, rear side marker lights and high mounted
stoplight consists of a number of LEDs. If any of the LEDs burn out, take
your vehicle to your Toyota dealer to have the light replaced.
■ Condensation build-up on the inside of the lens
Temporary condensation build-up on the inside of the headlight lens does
not indicate a malfunction. Contact your Toyota dealer for more information
in the following situations:
● Large drops of water have built up on the inside of the lens.
● Water has built up inside the headlight.
■ When replacing light bulbs
P. 723
Page 733 of 872

733
4-3. Do-it-yourself maintenance
4
Maintenance and care
SIENNA_OM_OM45483U_(U)
CAUTION
■
Replacing light bulbs
●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.
● Do not touch the glass portion of the light bulb with bare hands. When i\
t 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.
● 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.
● Do not attempt to repair or disassemble the bulb, socket, electrical wiring,
or sub components. This may cause serious injury due to electric shock.
●Vehicles with discharge headlights:
While the low beam headlights are
turned on, and for a short time after
they have been turned off, metal com-
ponents at the rear of the headlight
assembly will be extremely hot. To pre-
vent burns, do not touch these metal
components until you are certain they
have cooled down.
Metal components
Page 734 of 872

734 4-3. Do-it-yourself maintenance
SIENNA_OM_OM45483U_(U)
CAUTION
■Discharge headligh ts (if equipped)
● Contact your Toyota dealer before replacing discharge headlights (includ-
ing light bulbs).
● Do not touch the discharge headlight’s high voltage socket when the head-
lights are turned on.
An extremely high voltage of 30000 V will be discharged and could result
in serious injury or death by electric shock.
● Do not attempt to take apart or repair the low beam headlight bulbs, con-
nectors, power supply circuits, or related components.
Doing so could result in electric shock and serious injury or death.
■ When replacing the rear turn signal lights
Inspect the gasket for any damage (rip, tear, hole, etc.). If there is any dam-
age, please contact your Toyota dealer and have the gasket replaced.
Improper installation of the gasket may result in water entering the rear light
unit.
■ To prevent damage or fire
Make sure bulbs are fully seated and locked.
NOTICE
■When installing the back door trim
To prevent damage, be careful not to pinch any of the wire harnesses or
connectors with the back door trim.
Page 735 of 872

When trouble arises5
735
SIENNA_OM_OM45483U_(U)
5-1. Essential informationEmergency flashers ......... 736
If your vehicle needs to be towed .................... 737
If you think something is wrong ......................... 741
Fuel pump shut off system ........................... 742 5-2. Steps to take in an
emergency
If a warning light turns on or a warning buzzer
sounds... ....................... 743
If a warning message is displayed........................ 758
If you have a flat tire (vehicles with
run-flat tires)................... 759
If you have a flat tire (vehicles with
standard tires) ................ 761
If the engine will not start .......................... 776
If the shift lever cannot be shifted from P............ 778
If you lose your keys ........ 780
If the electronic key does not operate properly....... 781
If the battery is discharged ..................... 784
If your vehicle overheats ....................... 790
If the vehicle becomes stuck .............................. 793
If your vehicle has to be stopped in an
emergency ..................... 795
Page 736 of 872
736
SIENNA_OM_OM45483U_(U)
5-1. Essential information
Emergency flashers
NOTICE
■To prevent battery discharge
Do not leave the emergency flashers on longer than necessary when the
engine is not running.
Use the emergency flashers if th e vehicle malfunctions or is
involved in an accident.
Press the switch to flash all
the turn signal lights. To turn
them off, press the switch
once again.