2023 TOYOTA SIENNA HYBRID Owners Manual

4637-2. Steps to take in an emergency
7
When trouble arises
Fluid leaks under the vehicle
(Water dripping from the air
conditioning after use or drip-
ping from the muffler is nor-
mal.)
 Flat-looking tires or uneven
tire wear
 Engine coolant temperature
gauge needle continually
points higher 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 hybrid system
 Engine missing, stumbling or
running roughly
 Appreciable loss of power 
Vehicle pulls heavily to one
side when braking
 Vehicle pulls heavily to one
side when driving on a level
road
 Loss of brake effectiveness,
spongy feeling, pedal almost
touches the floor
If you think something
is wrong
If you notice any of the fol-
lowing symptoms, your
vehicle probably needs
adjustment or repair. Con-
tact your Toyota dealer as
soon as possible.
Visible symptoms
Audible symptoms
Operational symptoms

4647-2. Steps to take in an emergency
■Brake system warning light (warning buzzer)
■Brake system warning light
■Charging system warning light*
*: This light illuminates on the mu lti-information display with a message.
If a warning light turns 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 malfunc-
tion in the system. However, if this continues to occur, have
the vehicle inspected by your Toyota dealer.
Actions to the warning lights or warning buzzers
Warning lightDetails/Actions
(U.S.A.)
(Red)
(Canada)
Indicates that:
 The brake fluid level is low; or
 The brake system is malfunctioning
 Immediately stop the vehicle in a safe place and
contact your Toyota dealer. Continuing to drive
the vehicle may be dangerous.
Warning lightDetails/Actions
(Yellow)
Indicates a malfunction in:
The parking brake system;
 The regenerative braking system; or
 The electronically controlled brake system
 Have the vehicle insp ected by your Toyota
dealer immediately.
Warning lightDetails/Actions
Indicates a malfunction in the vehicle’s charging sys-
tem
 Immediately stop the vehicle in a safe place and
contact your Toyota dealer.

4657-2. Steps to take in an emergency
7
When trouble arises
■High coolant temperature warning light* (warning buzzer)
*: This light illuminates on the mu lti-information display with a message.
■Hybrid system overheat warning light* (warning buzzer)
*: This light illuminates on the mu lti-information display with a message.
■Low engine oil pressure warning light* (warning buzzer)
*: This light illuminates on the mu lti-information display with a message.
■Malfunction indicator lamp
Warning lightDetails/Actions
Indicates that the engine coolant temperature is too
high
 Immediately stop the v ehicle in a safe place.
Handling method ( P.509)
Warning lightDetails/Actions
Indicates that the hybri d system has overheated
 Stop the vehicle in a safe place.
Handling method ( P.509)
Warning lightDetails/Actions
Indicates that the engine oil pressure is too low
 Immediately stop the vehicle in a safe place and
contact your Toyota dealer.
Warning lightDetails/Actions
(U.S.A.)
(Canada)
Indicates a malfunction in:
 The hybrid system;
 The electronic engi ne control system;
 The electronic throttle control system; or
 The emission control system (if equipped)
 Have the vehicle insp ected by your Toyota
dealer immediately.

4667-2. Steps to take in an emergency
■SRS warning light
■ABS warning light
■Electric power steering system warning light (warning
buzzer)
Warning lightDetails/Actions
Indicates a malfunction in:
The SRS airbag system;
 The front passenger occupan t classification system;
or
 The seat belt pretensioner system
 Have the vehicle insp ected by your Toyota
dealer immediately.
Warning lightDetails/Actions
(U.S.A.)
(Canada)
Indicates a malfunction in:
 The ABS; or
 The brake assist system
 Have the vehicle insp ected by your Toyota
dealer immediately.
Warning lightDetails/Actions
(Red/yellow)
Indicates a malfun ction in the EPS (Electric Power
Steering) system
 Have the vehicle insp ected by your Toyota
dealer immediately.

4677-2. Steps to take in an emergency
7
When trouble arises
■PCS warning light (warning buzzer)
■LTA indicator (warning buzzer)
■Intuitive parking assist OFF indicator (warning buzzer)
Warning lightDetails/Actions
(Flashes or illumi-
nates)
When a buzzer sounds simultaneously:
Indicates a malfunction has occurred in the PCS (Pre-
Collision System).
 Have the vehicle insp ected by your Toyota
dealer immediately.
When a buzzer does not sound:
The PCS (Pre-Collision System) has become tempo-
rarily unavailable, correctiv e action may be necessary.
 Follow the instructions d isplayed on the multi-
information display. ( P.268, 478)
If the PCS (Pre-Collision S ystem) or VSC (Vehicle Sta-
bility Control) syst em is disabled, the PCS warning
light will illuminate.
 P.277
Warning lightDetails/Actions
(Orange)
Indicates a malfunction in the LTA (Lane Tracing
Assist)
Follow the instructions d isplayed on the multi-
information display. ( P.288)
Warning lightDetails/Actions
(If equipped)
When a buzzer sounds:
Indicates a malfunction in t he Intuitive parking assist
function
 Have the vehicle insp ected by your Toyota
dealer immediately.
When a buzzer does not sound:
Indicates that the system i s temporarily unavailable,
possibly due to a sensor bei ng dirty or covered with
ice, etc.
 Follow the instructions d isplayed on the multi-
information display. ( P.314, 475)

4687-2. Steps to take in an emergency
■RCD OFF indicator (warning buzzer)
■PKSB OFF indicator (warning buzzer)
■RCTA OFF indicator (warning buzzer)
Warning lightDetails/Actions
(If equipped)
When a buzzer sounds:
Indicates a malfunction in the RCD (Rear Camera
Detection) function
 Have the vehicle insp ected by your Toyota
dealer immediately.
When a buzzer does not sound:
Indicates that the function temporarily cannot be used
due to the camera being dirty, etc.
 Follow the instructions d isplayed on the multi-
information display. ( P.322, 475)
Warning lightDetails/Actions
(If equipped)
When a buzzer sounds:
Indicates a malfun ction in the PKSB ( Parking Support
Brake) system
 Have the vehicle insp ected by your Toyota
dealer immediately.
When a buzzer does not sound:
Indicates that the system i s temporarily unavailable,
possibly due to a sensor bei ng dirty or covered with
ice, etc.
 Follow the instructions d isplayed on the multi-
information display. ( P.328, 475)
Warning lightDetails/Actions
(If equipped)
When a buzzer sounds:
Indicates a malfunction in t he RCTA (Rear Cross Traf-
fic Alert) function
 Have the vehicle insp ected by your Toyota
dealer immediately.
When a buzzer does not sound:
Indicates that the rear bumper around the radar sen-
sor is covered with dirt, etc. (P.304)
 Follow the instructions d isplayed on the multi-
information display. ( P.304, 475)

4697-2. Steps to take in an emergency
7
When trouble arises
■Slip indicator
■Brake Override System/Drive-Start Control/PKSB (if
equipped) warning light* (warning buzzer)
*: This light illuminates on the mu lti-information display with a message.
■Brake hold operated indicator (warning buzzer)
Warning lightDetails/Actions
Indicates a malfunction in:
The VSC/Trailer Sway Control system;
 The TRAC system; or
 The hill-start assist control system
 Have the vehicle insp ected by your Toyota
dealer immediately.
Warning lightDetails/Actions
When a buzzer sounds:
 Brake Override System is malfunctioning;
 Drive-Start Control is operating;
 Drive-Start Control i s malfunctioning; or
 Parking Support Brake function (for static objects) (if
equipped) is operating
 Follow the instructions d isplayed on the multi-
information display.
When a buzzer does not sound:
Brake Override Syst em is operating
 Release the accelerator pedal and depress the
brake pedal.
Warning lightDetails/Actions
(Flashes)
Indicates a malfunction in the brake hold system
 Have the vehicle insp ected by your Toyota
dealer immediately.

4707-2. Steps to take in an emergency
■Parking brake indicator
■Tire pressure warning light
■Low fuel level warning light
Warning lightDetails/Actions
(U.S.A.)
(Flashes)
(Canada)
(Flashes)
It is possible that the parking brake is not fully
engaged or released
 Operate the parking br ake switch once again.
This light comes on when the parking brake is not
released. If the light turns off after the parking brake is
fully released, the system is operating normally.
Warning lightDetails/Actions
When the light comes on afte r blinking for approxi-
mately 1 minute:
Malfunction in the tire pressure warning system
 Have the system checked by your Toyota dealer.
When the light comes on:
Low tire inflation pressure such as
 Natural causes
 Flat tire
 Immediately stop the v ehicle in a safe place.
Handling method ( P.472)
Warning lightDetails/Actions
Indicates that remaining fuel is approximately 2.7 gal.
(10.2 L, 2.2 Imp. gal.) or less
 Refuel the vehicle.