Page 653 of 784

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PRIUS PRIME_OM_OM47A88U_(U)
8
When trouble arises
8-2. Steps to take in an emergency
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 malfunction in the
system. However, if this continues to occur, have the vehicle
inspected by your Toyota dealer.
Warning light and warning buzzer list
Warning lightWarning light/Details/Actions
(U.S.A.)
(Canada)
Brake system warning light and warning buzzer (red
indicator)
*1
Indicates that:
• The brake fluid level is low; or
• The brake system is malfunctioning
→ Immediately stop the vehicle in a safe place and con-
tact your Toyota dealer. Continuing to drive the vehi-
cle may be dangerous.
Brake system warning light (yellow indicator)
Indicates a malfunction in:
• The regenerative braking system; or
• The electronically controlled brake system
→ Have the vehicle inspected by your Toyota dealer
immediately.
Charging system warning light
Indicates a malfunction in the vehicle’s charging system
→ Immediately stop the vehicle in a safe place and con-
tact your Toyota dealer.
Low engine oil pressure warning light
(warning buzzer)
*2
Indicates that the engine oil pressure is too low
→ Immediately stop the vehicle in a safe place and con-
tact your Toyota dealer.
(U.S.A.)
(Canada)
Malfunction indicator lamp Indicates a malfunction in:
• The hybrid system;
• The electronic engine control system; or
• The electronic throttle control system
→ Have the vehicle inspected by your Toyota dealer
immediately.
Page 664 of 784

6648-2. Steps to take in an emergency
PRIUS PRIME_OM_OM47A88U_(U)
The warning lights and warning buzzers operate as follows depending
on the content of the message. If a message indicates the need for
inspection by a dealer, have the vehicle inspected by your Toyota
dealer immediately.
The operation of the warning lights and warning buzzers may differ
from those stated. In this case, perform the correction procedure
according to the displayed message.
*: A buzzer sounds the first time a message is shown on the multi-informa- tion display.
Messages and warnings
System
warning lightWarning
buzzer
*Warning
Comes on⎯Sounds
Indicates an important situation, such
as when a system related to driving is
malfunctioning or that danger may
result if the correction procedure is not
performed
⎯Comes on or flashesSounds
Indicates an important situation, such
as when the systems shown on the
multi-information display may be mal-
functioning
Flashes⎯Sounds
Indicates a situation, such as when
damage to the vehicle or danger may
result
Comes on⎯Does not sound
Indicates a condition, such as mal-
function of electrical components, their
condition, or indicates the need for
maintenance
Flashes⎯Does not
sound
Indicates a situation, such as when an
operation has been performed incor-
rectly, or indicates how to perform an
operation correctly
Page 665 of 784

6658-2. Steps to take in an emergency
PRIUS PRIME_OM_OM47A88U_(U)
8
When trouble arises
■Warning messages
The warning messages explained below may differ from the actual messages
according to operation conditions and vehicle specifications.
■ System warning lights
The master warning light does not come on or flash in the following cases.
Instead, a separate system warning light will come on along with a message
shown on the multi-information display.
●“Antilock Brake System Malfunction Visit Your Dealer”:
The ABS warning light comes on. ( →P. 654)
● “Braking Power Low Visit Your Dealer”:
The brake system warning light (yellow) will come on. ( →P. 653)
● Indicates that a door is not fully closed while the vehicle is stopped.:
The Open door warning light comes on. ( →P. 655)
■ If “Visit Your Dealer” is shown
The system or part shown on the multi-information display is malfunctioning.
Have the vehicle inspected by your Toyota dealer.
■ If a message about an operation is shown
●If a message about an operation of the accelerator pedal or brake pedal is
shown
A warning message about an operation of the brake pedal may be shown
while the driving assist systems such as PCS (Pre-Collision System) or the
dynamic radar cruise control with full-speed range is operating. If a warning
message is shown, be sure to decelerate the vehicle or follow an instruction
shown on the multi-information display.
● A warning message is shown when Drive-Start Control, Brake Override Sys-
tem or Intelligent Clearance Sonar (if equipped) operates ( →P. 308, 308,
435). Follow the instructions on the multi-information display.
● If a message about an operation of the power switch is shown
An instruction for operation of the power switch is shown when the incorrect
procedure for starting the hybrid system is performed or the power switch is
operated incorrectly. Follow the instructions shown on the multi-information
display to operate the power switch again.
● If a message about a shift operation is shown
To prevent the shift position from being selected incorrectly or the vehicle
from moving unexpectedly, the shift position may be changed automatically
(→P. 332) or shift operation may be required. In this case, change the shift
position following the instructions on the multi-information display.
● If a message or image about an open/close state of a part or replenishment
of a consumable is shown
Confirm the part indicated by the multi-information display or a warning light,
and then perform the coping method such as closing the open door or
replenishing a consumable.
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PRIUS PRIME_OM_OM47A88U_(U)
8-2. Steps to take in an emergency
If the hybrid system will not start
One of the following may be the cause of the problem:
●The charging cable may be attached to the vehicle. ( →P. 136)
● The electronic key may not be functioning properly.
* (→ P. 690)
● There may not be sufficient fuel in the vehicle’s tank.
Refuel the vehicle. ( →P. 92)
● There may be a malfunction in the immobilizer system.
* (→ P. 7 5 )
● There may be a malfunction in the shift control system.
*
( → P. 327, 669)
● The hybrid system may be malfunctioning due to an electrical prob-
lem such as electronic key battery depletion or a blown fuse. How-
ever, depending on the type of malfunction, an interim measure is
available to start the hybrid system. (→ P. 689)
● There is a possibility that the temperature of the hybrid battery
(traction battery) is extremely low (approximately below -22°F
[-30°C]). ( →P. 92, 326)
*: It may not be possible to shift the shift position other than P.
One of the following may be the cause of the problem:
● The 12-volt battery may be discharged. ( →P. 694)
● The 12-volt battery terminal con nections may be loose or corroded.
( → P. 587)
Reasons for the hybrid system not starting vary depending on
the situation. Check the follo wing and perform the appropriate
procedure:
The hybrid system will not start even though the correct starting
procedure is being followed. ( →P. 324)
The interior lights and headlights are dim, or the horn does not
sound or sounds at a low volume.
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6898-2. Steps to take in an emergency
PRIUS PRIME_OM_OM47A88U_(U)
8
When trouble arises
One of the following may be the cause of the problem:
●The 12-volt battery may be discharged. ( →P. 694)
● One or both of the 12-volt batter y terminals may be disconnected.
( → P. 587)
Contact your Toyota dealer if the problem cannot be repaired, or if repair
procedures are unknown.
When the hybrid system does not start, the following steps can be
used as an interim measure to star t the hybrid system if the power
switch is functioning normally.
Do not use this starting procedure except in cases of emergency.
Set the parking brake.
Turn the power switch to ACCESSORY mode.
Press and hold the power switch for about 15 seconds while
depressing the brake pedal firmly.
Even if the hybrid system can be started using the above steps, the
system may be malfunctioning. Have the vehicle inspected by your
Toyota dealer.
The interior lights and headlight s do not turn on, or the horn
does not sound.
Emergency start function
1
2
3
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6968-2. Steps to take in an emergency
PRIUS PRIME_OM_OM47A88U_(U)
Once the hybrid system has started, 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 hybrid system starts, ha ve the vehicle inspected at your
Toyota dealer as soon as possible.
■ When opening the cover of th e positive (+) battery terminal
→P. 587
■ Starting the hybrid system when the 12-volt battery is discharged
The hybrid system cannot be started by push-starting.
■ To prevent 12-volt battery discharge
●Turn off the headlights and the audio system while the hybrid system is off.
● Turn off any unnecessary electrical components when the vehicle is running
at a low speed for an extended period, such as in heavy traffic.
■ When the 12-volt battery is removed or discharged
●Information stored in the ECU is cleared. When the 12-volt battery is
depleted, have the vehicle inspected at your Toyota dealer.
● Some systems may require initialization. ( →P. 743)
■ When removing the 12-volt battery terminals
When the 12-volt battery terminals are removed, the information stored in the
ECU is cleared. Before removing the 12-volt battery terminals, contact your
Toyota dealer.
■ Charging the 12-volt battery
The electricity stored in the 12-volt battery will discharge gradually even when
the vehicle is not in use, due to natural discharge and the draining effects of
certain electrical appliances. If the vehicle is left for a long time, the 12-volt
battery may discharge, and the hybrid system may be unable to start. (The
12-volt battery recharges automatically while the hybrid system is operating.)
7
8
Page 715 of 784
PRIUS PRIME_OM_OM47A88U_(U)
7159-1. Specifications
9
Vehicle specifications
*: The fluid capacity is the quantity of reference.If replacement is necessary, contact your Toyota dealer.
Electrical system (12-volt battery)
Open voltage at 68 °F (20 °C):
12.0 V or higher
If the voltage is lower than the standard
value, charge the 12-volt battery.
(Voltage is checked 30 seconds after the
hybrid system and all lights are turned off.)
Charging rates5 A max.
Transmission
Fluid capacity*3.9 qt. (3.7 L, 3.3 Imp.qt.)
Fluid typeToyota Genuine ATF WS
NOTICE
■ Transmission fluid type
Using transmission fluid other than “Toyota Genuine ATF WS” may cause
deterioration in shift quality, locking up of your transmission accompanied
by vibration, and ultimately damage the transmission of your vehicle.
Page 717 of 784
PRIUS PRIME_OM_OM47A88U_(U)
7179-1. Specifications
9
Vehicle specifications
Light bulbs
Light bulbsBulb No.WTy p e
ExteriorBack-up lights92116A
Interior
Vanity lights⎯8A
Front interior/personal lights⎯5A
Rear interior light⎯8B
Door courtesy lights⎯5A
Luggage compartment light⎯5A
A: Wedge base bulbs (clear)
B: Double end bulbs