stop start TOYOTA PRIUS PRIME 2023 Service Manual

2445-1. Before driving
WARNING
●Always apply the parking brake,
shift the shift position to P, stop
the hybrid system and lock the
vehicle.
Do not leave the vehicle unat-
tended while the “READY” indi-
cator is illuminated.
If the vehicle is parked with the
shift position in P but the park-
ing brake is not set, the vehicle
may start to move, possibly
leading to an accident.
●Do not touch the exhaust pipes
while the “READY” indicator is
illuminated or immediately after
turning the hybrid system off.
Doing so may cause burns.
■When taking a nap in the
vehicle
Always turn the hybrid system off.
Otherwise, if you accidentally shift
the shift position or depress the
accelerator pedal, this could
cause an accident or fire due to
hybrid system overheating. Addi-
tionally, if the vehicle is parked in
a poorly ventilated area, exhaust
gases may collect and enter the
vehicle, leading to death or a seri-
ous health hazard.
■When braking
●When the brakes are wet, drive
more cautiously.
Braking distance increases
when the brakes are wet, and
this may cause one side of the
vehicle to brake differently than
the other side. Also, the parking
brake may not securely hold the
vehicle.
●If the electronically controlled
brake system does not operate,
do not follow other vehicles
closely and avoid hills or sharp
turns that require braking.
In this case, braking is still pos-
sible, but the brake pedal
should be depressed more
firmly than usual. Also, the brak-
ing distance will increase. Have
your brakes fixed immediately.
●The brake system consists of 2
or more individual hydraulic sys-
tems; if one of the systems fails,
the other(s) will still operate. In
this case, the brake pedal
should be depressed more
firmly than usual and the brak-
ing distance will increase. Have
your brakes fixed immediately.
NOTICE
■When driving the vehicle
●Do not depress the accelerator
and brake pedals at the same
time during driving, as this may
restrain the hybrid system out-
put.
●Do not use the accelerator
pedal or depress the accelera-
tor and brake pedals at the
same time to hold the vehicle on
a hill.
■Avoiding damage to vehicle
parts
●Do not turn the steering wheel
fully in either direction and hold
it there for an extended period
of time.
Doing so may damage the
power steering.
●When driving over bumps in the
road, drive as slowly as possible
to avoid damaging the wheels,
underside of the vehicle, etc.

2535-2. Driving procedures
5
Driving
1Stop the vehicle completely.
2 If the parking brake is in man-
ual mode, set the parking
brake. ( P.263)
3 Press the P position switch.
( P.257)
Check that the shift position indica-
tor shows P and the parking brake
indicator is illuminated.
4Press the power switch.
The hybrid system will stop, and the meter display will
be extinguished
(the shift position indicator will be
extinguished a few seconds after
the meter display).
5 Release the brake pedal and
check that “ACCESSORY” or
“POWER ON” is not shown
on the meter.
■When the shift control system
malfunctions
If the shift control system is malfunc-
tioning, when attempting to turn the
power switch off, it may not be able
to be turned off. In this situation, it
may be possible to turn the power
switch off by applying the parking
brake and then operating the power
switch.
If there is a malfunction in the sys-
tem, have the vehicle inspected by
your Toyota dealer immediately.
■Automatic hybrid system shut
off feature
●The vehicle is equipped with a
feature that automa tically shuts off
the hybrid system when the shift
position is in P with the hybrid sys-
tem operating for an extended
period.
●The hybrid system will automati-
cally shut off after approximately 1
hour if it has been left operating
while the shift position is in P.
●The timer for the automatic hybrid
system shut off fe ature will reset if
the brake pedal is depressed or if
the shift position is in a position
other than P.
●After the vehicle is parked, if the
door is locked with the door lock
switch ( P.187) from the inside
or the mechanical key ( P.587)
from the outside, the automatic
hybrid system shut off feature will
be disabled. The timer for the
automatic hybrid system shut off
feature will be re- enabled if the
driver’s door is opened.
WARNING
■When starting the hybrid sys-
tem
Always start the hybrid system
while sitting in the driver’s seat.
Do not depress the accelerator
pedal while starting the hybrid
system under any circumstances.
Doing so may cause an accident
resulting in death or serious
injury.
NOTICE
■When starting the hybrid sys-
tem
If the hybrid system becomes diffi-
cult to start, have your vehicle
checked by your Toyota dealer
immediately.
■Symptoms indicating a mal-
function with the power
switch
If the power switch seems to be
operating somewhat differently
than usual, such as the switch
sticking slightly, there may be a
malfunction. Contact your Toyota
dealer immediately.
Stopping the hybrid sys-
tem

2545-2. Driving procedures
Modes can be changed by
pressing the power switch with
the brake pedal released. (The
mode changes each time the
switch is pressed.)
WARNING
■Stopping the hybrid system
in an emergency
●If you want to stop the hybrid
system in an emergency while
driving the vehicle, press and
hold the power switch for more
than 2 seconds, or press it
briefly 3 times or more in suc-
cession. (P.547)
However, do not touch the
power switch while driving
except in an emergency. Turn-
ing the hybrid system off while
driving will not cause loss of
steering or braking control.
However, power assist for the
steering wheel may be lost mak-
ing it difficult to steer smoothly
before stopping the vehicle
depending on the remaining
charge in the 12-volt battery or
usage conditions. In this situa-
tion, you should pull over and
stop the vehicle as soon as it is
safe to do so.
●If the power switch is operated
while the vehicle is running, a
warning message will be shown
on the multi-information display
and a buzzer sounds.
●When restarting the hybrid sys-
tem after an emergency shut-
down, shift the shift position to
N and press the power switch
shortly and firmly.
■When parking
Exhaust gases include harmful
carbon monoxide (CO), which is
colorless and odorless. Observe
the following precautions.
Failure to do so may cause
exhaust gases to enter the vehicle
and may lead to an accident
caused by light-headedness, or
may lead to death or a serious
health hazard.
●If the vehicle is in a poorly venti-
lated area or a closed area,
such as a garage, stop the
hybrid system.
●Do not leave the vehicle with
the hybrid system operating for
a long time. If such a situation
cannot be avoided, park the
vehicle in an open space and
ensure that exhaust fumes do
not enter the vehicle interior.
●Do not leave the hybrid system
operating in an area with snow
build-up, or where it is snowing.
If snowbanks build up around
the vehicle while the hybrid sys-
tem is operating, exhaust gases
may collect and enter the vehi-
cle.
Changing power switch
modes

2565-2. Driving procedures
*: To improve fuel efficiency and reduce noise, set the shift posi-
tion in D for normal driving.
■When driving with dynamic
radar cruise control activated
Even when switching the driving
mode to sport mode with the intent
of enabling engine braking, engine
braking will not activate because
dynamic radar cruise control will not
be canceled.
■If a message about a shift oper-
ation is shown
To prevent the shift position from
being selected incorrectly or the
vehicle from moving unexpectedly,
the shift position may be changed
automatically or operating the shift
lever may be required . In this case,
change the shift position following
the messages on the multi-informa-
tion display.
■Restraining sudden start (Drive-
Start Control)
 P.245
Transmission
Select the shift position
depending on your purpose
and situation.
Shift position purpose
and functions
Shift posi-
tionObjective or function
P
Parking the vehi-
cle/starting the hybrid system
RReversing
N
Neutral
(Condition in which the power is not transmit- ted)
DNormal driving*
B
Applying engine brak-ing or strong braking
when the accelerator pedal has been
released on steep
downward slopes etc.
WARNING
■When driving on slippery
road surfaces
Do not accelerate or shift the shift
position suddenly.
Sudden changes in engine brak-
ing may cause the vehicle to spin
or skid, resulting in an accident.
NOTICE
■Hybrid battery (traction bat-
tery) charge
If the shift position is in N, the
hybrid battery (traction battery)
will not be charged. To help pre-
vent the battery from discharging,
avoid leaving the N position
selected for an extended period of
time.
■Situations where shift con-
trol system malfunctions are
possible
If any of the following situations
occurs, shift control system mal-
functions are possible.
Immediately stop the vehicle in a
safe place on level ground, apply
the parking brake, and then con-
tact your Toyota dealer.

2595-2. Driving procedures
5
Driving
met, while the shift position is in a
position other than P
• The power switch is in ON.
• The driver is not wearing the seat
belt.
• The brake pedal is not depressed.
To start off the vehi cle after the shift
position is changed to P, operate
the shift lever again.
●When the vehicle is stopped after
the hybrid system has been
stopped in an emergency while
driving.
●When voltage of the 12-volt bat-
tery drops while the shift position
is in a position other than P.
*: When the power switch is pressed while driving at extremely slow
speeds, such as immediately
before stopping the vehicle, the
shift position may automatically
change to P. Make sure that the
vehicle is completely stopped
before pressing the power switch.
■If the shift position cannot be
shifted from P
There is a possibility that the 12-volt
battery is discharged. Check the 12-
volt battery in this situation.
(  P.589)
■Customization
Some functions can be customized.
(  P.618)
 By performing the following
operation, the shift position
can be held in N until the shift
position switches to P without
activating the automatic P
position selection function.
WARNING
■For the shift lever
●Do not remove the shift lever
knob or use anything but a gen-
uine Toyota shift lever knob.
Also, do not hang anything on
the shift lever. Doing so could
prevent the shift lever from
returning to position, causing
unexpected accidents to occur
when the vehicle is in motion.
●In order to prevent the shift
position from accidentally being
changed, do not touch the shift
lever when not using them.
■P position switch
●Do not press the P position
switch while the vehicle is mov-
ing.
If the P position switch is pressed
when driving at very low speeds
(for example, directly before stop-
ping the vehicle), the vehicle may
stop suddenly when the shift posi-
tion switches to P, which could
lead to an accident.
●In order to prevent the shift
position from accidentally being
changed, do not touch the P
position switch when not using
them.
NOTICE
■When exiting the vehicle
(driver’s seat only)
Check that the shift position indi-
cator shows P and that the park-
ing brake indicator is illuminated
before opening the door and exit-
ing the vehicle.
Keeping the shift position
in N without activating the
automatic P position
selection function

2605-2. Driving procedures
1Operate the shift lever and
change the shift position to N
when the hybrid system is
operating.
2 Return the shift lever to its
regular position ( ).
3 Operate the shift lever to N
and hold it there until the
buzzer sounds.
4 Press the power switch within
5 seconds after the buzzer
sounds.
The hybrid system stops with the
shift position in N.*
Make sure to check that the buzzer
sounds and “Holding N Push P
Switch When Done” is displayed on
the multi-information display.
 In order to shift to a position
other than N, first press the P
position switch to change the
shift position to P.
 If the automatic P position
selection function is operated
with the hybrid system
stopped, the automatic P
position selection function
may not operate.
Always perform the operation
with the hybrid system
started.
*: To keep this state, do not operate
the power switch. If the power
switch is operated repeatedly, the
power switch will turn off after the
shift position has automatically
changed to P.
When the shift position is shifted
to B, the Regeneration Boost
operates and control of acceler-
ation and deceleration is per-
formed with the operation of the
accelerator pedal only, reduc-
ing the frequency of changing
from the accelerator pedal to
depress the brake pedal. The
deceleration can be set for when
the accelerator pedal is
released and the accelerator
pedal can be slowly released
without completely removing
your foot to enable smooth
deceleration.
■Changing Regeneration
Boost settings
Regenerative braking force can
be changed when the Regener-
ation Boost is operating by
selecting “ Vehicle Settings”
from on the multi-information
display and selecting “Regener-
ative Brake”. In addition, the
regenerative braking force that
was set can be stored by switch-
ing “Deceleration Memory” to
“ON”. ( P.166)
If “Deceleration Memory” is
switched to “OFF”, the regenerative
braking force will return to “Low”
whenever the power switch is
turned to ON.
■Regenerative braking force
settings display
When the shift position is shifted
Regeneration Boost

2665-2. Driving procedures
Turn the brake hold system on
The brake hold standby indicator
(green) comes on. While the
system is holding the brake, the
brake hold operated indicator (yel-
low) comes on.
■Brake hold system operating
conditions
The brake hold system cannot be
turned on in the following condi-
tions:
●The driver’s door is not closed.
●The driver is not wearing the seat
belt.
NOTICE
■When parking the vehicle
Before you leave the vehicle, shift
the shift position to P, set the
parking brake and make sure that
the vehicle does not move.
■When the system malfunc-
tions
Stop the vehicle in a safe place
and check the warning messages.
■When the vehicle 12-volt bat-
tery is discharged
The parking brake system cannot
be activated. ( P.589)
■When the parking brake can-
not be released due to a mal-
function
Driving the vehicle with the park-
ing brake set will lead to brake
components overheating, which
may affect braking performance
and increase brake wear. Have
the vehicle inspected by your
Toyota dealer immediately if this
occurs.
Brake Hold
The brake hold system
keeps the brake applied
when the shift position is in
D or N with the system on
and the brake pedal has
been depressed to stop the
vehicle. The system
releases the brake when the
accelerator pedal is
depressed with the shift
position in D to allow
smooth start off.
Enabling the system
A
B

3235-5. Using the driving support systems
5
Driving
rounding conditions
●In the following situations, system
operation may be canceled:
• When the brake control or output restriction control of a driving sup-
port system operates (For exam-
ple: PCS, drive-start control)
• When the system determines that
a detected object has moved
away from the vehicle
• When lane lines can no longer be
detected
• When the brake pedal has been depressed
• When the accelerator pedal has been depressed
• When the steering wheel has
been operated with more than a
certain amount of force
• When the turn signal lever is oper-
ated to the left/right turn position
WARNING
■Situations in which the sys-
tem may not operate properly
●Situations in which the lane may
not be detected: P.291
●When a detectable object stops
immediately before entering the
path of the vehicle
●When passing extremely close
to a detectable object behind a
guardrail, fence, etc.
●When changing lanes while
overtaking a detectable object
●When passing a detectable
object that is changing lanes or
turning left/right
●When there are objects (guard-
rails, power poles, trees, walls,
fences, poles, traffic cones,
mailboxes, etc.) in the surround-
ing area
●When there are patterns or a
painting ahead of the vehicle
that may be mistaken for a
detectable object
●When passing through a place
with a low structure above the
road (tunnel with a low ceiling,
traffic sign, signboard, etc.)
●When driving on snowy, icy, or
rutted roads
●When a detectable object is
approaching your vehicle
●When your vehicle or a detect-
able object is wandering
●When the movement of a
detectable object changes
(change in direction, sudden
acceleration or deceleration,
etc.)
●When suddenly approaching a
detectable object
●When a preceding vehicle or
motorcycle is not directly in front
of your vehicle
●When there is a structure above
a detectable object
●When part of a detectable
object is hidden by another
object (large luggage, umbrella,
guardrail, etc.)
●When multiple detectable
objects are overlapping
●When a bright light, such as the
sun or headlights of another
vehicle, is reflecting off of the
detectable object
●When the detectable object is
white and looks extremely bright
●When the color or brightness of
the detectable object causes it
to blend in with its surroundings
●When a detectable object cuts
in front of or emerges from
beside a vehicle

3335-5. Using the driving support systems
5
Driving
Constant speed cruising
When there are no vehicles ahead
The vehicle drives at the speed set by the driver.
If the set vehicle speed is exceeded while driving down a hill, the set vehicle
speed display will blink and a buzzer will sound.
Deceleration and follow-up cruising
When a preceding vehicle driving slower than the set vehicle
speed is detected
When a vehicle is detected driving ahead of your vehicle, the vehicle auto-
matically decelerates and if a greater reduction in vehicle speed is neces-
sary, the brakes are applied (the stop lights will come on at this time). The
vehicle is controlled to ma intain the vehicle-to-vehicle distance set by the
driver, in accordance with changes in the speed of the preceding vehicle. If
vehicle deceleration is not sufficient an d the vehicle approaches the vehicle
ahead, the ap proach warning will sound.
Acceleration
When there are no longer any pr eceding vehicles driving slower
than the set vehicle speed
The vehicle accelerates until the set vehicle speed is reached and then
resumes constant speed cruising.
Starting off
Basic functions
A
B
C
D

3345-5. Using the driving support systems
If a preceding vehicle stops, the vehicle will also stop (controlled
stop). After the preceding vehicle starts off, pressing the “RES”
switch or depressing the accelerator pedal will resume follow-up
cruising (start off operation). If a start off operation is not performed,
the controlled stop will continue.
Vehicles with Traffic Jam Assist : While driving on a highway or
expressway, if a preceding vehicl e stops, your vehicle will stop
accordingly. On some highways and expressways, if the system
determines that the preceding vehicle starts off within approximately
3 minutes of stopping, a buzzer will sound and a message will be
displayed on the multi-information display to notify the driver, and
your vehicle will start off accordingly following the preceding vehicle.
(Extended resume time)
■Meter display
Multi-information display
Set vehicle speed
Indicators
■Switches Driving assist mode select
switch
Driving assist switch
“+” switch/“RES” switch
“-” switch
Cancel switch
Vehicle-to-vehicle distance
switch
■Setting the vehicle speed
1 Press the driving assist mode
select switch to select
dynamic radar cruise control.
The dynamic radar cruise control
System components
A
B
C
B
C
FD
E
Using the dynamic radar
cruise control
A
B
C
D
E
F