2023 TOYOTA PRIUS PRIME warning light

5427-3. Do-it-yourself maintenance
Adjustment bolt A
Adjustment bolt B
 Make sure the vehicle has a
full tank of gasoline and the
area around the headlight is
not deformed.
 Park the vehicle on level
ground.
 Make sure the tire inflation
pressure is at the specified
level.
 Have someone sit in the
driver’s seat.
 Bounce the vehicle several
times.
WARNING
■To prevent system break-
downs and vehicle fire
Observe the following precau-
tions.
Failure to do so may cause dam-
age to the vehicle, and possibly a
fire or injury.
●Never use a fuse of a higher
amperage rating than that indi-
cated, or use any other object in
place of a fuse.
●Always use a genuine Toyota
fuse or equivalent.
Never replace a fuse with a
wire, even as a temporary fix.
●Do not modify the fuses or fuse
boxes.
NOTICE
■Before replacing fuses
Have the cause of electrical over-
load determined and repaired by
your Toyota dealer as soon as
possible.
■To prevent damage to the
engine compartment fuse box
cover
When opening the fuse box, com-
pletely release the claw locks
before lifting up the cover. Other-
wise, the claws may be damaged.
Headlight aim
Vertical movement adjust-
ing bolts
Before checking the head-
light aim
A
B

545
8
8
When trouble arises
When trouble arises
8-1. Essential informationEmergency flashers .... 546
If your vehicle has to be stopped in an emergency.................................. 547
If the vehicle is submerged or water on the road is ris-
ing ............................. 548
8-2. Steps to take in an emer- gency
If your vehicle needs to be towed......................... 550
If you think something is wrong ........................ 554
If a warning light turns on or a warning buzzer sounds
.................................. 555
If a warning message is dis- played........................ 566
If you have a flat tire.... 574
If the hybrid system will not start ........................... 584
If you lose your keys ... 586
If the electronic key does not operate properly .. 587
If the 12-volt battery is dis- charged ..................... 589
If your vehicle overheats .................................. 594
If the vehicle becomes stuck .......................... 597

5548-2. Steps to take in an emergency
Fluid leaks under the vehicle
(Water dripping from the air
conditioning after use is nor-
mal.)
 Flat-looking tires or uneven
tire wear
 High coolant temperature
warning light flashes or
comes on
 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

5558-2. Steps to take in an emergency
8
When trouble arises
■Brake system warning light (warning buzzer)
■Brake system warning light (warning buzzer)
■Charging system warning light* (warning buzzer)
*: This light illuminates on the multi-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.)
(Canada) (Red)
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 inspected by your Toyota
dealer immediately.
Warning lightDetails/Actions
Indicates a malfunction in the vehicle’s charging
system
Immediately stop the vehicle in a safe
place and contact your Toyota dealer.

5568-2. Steps to take in an emergency
■High coolant temperature warning light (warning buzzer)
■Low engine oil pressure warning light* (warning buzzer)
*: This light illuminates on the multi-information display with a message.
■Hybrid system overheat warning light* (warning buzzer)
*: This light illuminates on the multi- information display with a message.
■Malfunction indicator lamp
Warning lightDetails/Actions
Indicates that the engine is overheating
Immediately stop the vehicle in a safe
place.
Handling method ( P.594)
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.
( P.506)
Warning lightDetails/Actions
Indicates that the hybrid system has overheated
 Stop the vehicle in a safe place. Handling
method ( P.595)
Warning lightDetails/Actions
(U.S.A.)
(Canada)
Indicates a malfunction in:
 The hybrid system;
 The electronic engine control system;
 The electronic throttle control system; or
 The emission control system (if equipped)
 Have the vehicle inspected by your Toyota
dealer immediately.

5578-2. Steps to take in an emergency
8
When trouble arises
■SRS warning light (warning buzzer)
This warning light indicates problems with the following:
 Airbag sensor assembly
 Front impact sensors
 Side impact sensors (front door)
 Side impact sensors (front)
 Front passenger occupant classification sensors
 Front passenger’s seat belt buckle switch
 SRS warning light
 “PASSENGER BAG ON” indicator light
 “PASSENGER BAG OFF” indicator light
 SRS airbags
 SRS system related wiring harnesses and power sources
■ABS warning light (warning buzzer)
Warning lightDetails/Actions
Indicates a malfunction in:
The SRS airbag system; or
 The seat belt pretensioner system
 Have the vehicle inspected 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 inspected by your Toyota
dealer immediately.

5588-2. Steps to take in an emergency
■Electric power steering system warning light (warning
buzzer)
■PCS warning light (warning buzzer)
■LTA indicator (warning buzzer)
■LDA indicator (warning buzzer)
Warning lightDetails/Actions
(Red)
(Yellow)
Indicates a malfunction in the EPS (Electric
Power Steering) system
 Have the vehicle inspected by your Toyota
dealer immediately.
Warning lightDetails/Actions
Indicates a malfunction in the PCS (Pre-Colli-
sion System).
Follow the instructions displayed on the
multi-information display.
If the PCS (Pre-Collision System) or VSC (Vehi-
cle Stability Control) system is disabled, the
PCS warning light will illuminate.
Warning lightDetails/Actions
(Yellow)
Indicates a malfunction in the LTA (Lane Trac-
ing Assist)
 Follow the instructions displayed on the
multi-information display.
Warning lightDetails/Actions
(Yellow)
Indicates a malfunction in the LDA (Lane Depar-
ture Alert)
Follow the instructions displayed on the
multi-information display.

5598-2. Steps to take in an emergency
8
When trouble arises
■PDA indicator (warning buzzer)
■Cruise control indicator (warning buzzer)
■Dynamic radar cruise control indicator (warning buzzer)
■Driving assist information indicator
Warning lightDetails/Actions
(Yellow)
Indicates a malfunction in the PDA (Proactive
Driving Assist).
Follow the instructions displayed on the
multi-information display.
Warning lightDetails/Actions
(Yellow)
Indicates a malfunction in the cruise control sys-
tem.
Follow the instructions displayed on the
multi-information display.
Warning lightDetails/Actions
(Yellow)
Indicates a malfunction in the dynamic radar
cruise control system.
Follow the instructions displayed on the
multi-information display.
Warning lightDetails/Actions
Indicates one of the following systems is mal-
functioning.
PCS (Pre-Collision System)
 LDA (Lane Departure Alert)
 Follow the instructions displayed on the
multi-information display.
Indicates one of the following systems is mal-
functioning or disabled.
 PKSB (Parking Support Br ake) (if equipped)
 RCD (Rear Camera Detection) (if equipped)
 BSM (Blind Spot Monitor) (if equipped)
 RCTA (Rear cross traffic alert) (if equipped)
 Safe Exit Assist (if equipped)
 Follow the instructions displayed on the
multi-information display.