key TOYOTA PRIUS 2021 (in English) Workshop Manual

6497-2. Steps to take in an emergency
PRIUS_OM_OM47E09U_(U)
7
When trouble arises
■Stopping the hybrid system
Set the parking brake, shift the shift position to P and press the power switch
as you normally do when stopping the hybrid system.
■ Replacing the key battery
As the above procedure is a temporary measure, it is recommende d that the
electronic key battery be replaced immediately when the battery is depleted.
( P. 560)
■ Changing power switch modes
Release the brake pedal and press the power switch in step abo ve. The
hybrid system does not start and modes will be changed each tim e the switch
is pressed. ( P. 247)
■ When the electronic key does not work properly
●Make sure that the smart key system has not been deactivated in the cus-
tomization setting. If it is off, turn the function on.
(Customizable features: P. 690)
● Check if battery-saving mode is set. If it is set, cancel the f unction.
( P. 198)
WARNING
■ When using the mechanical key and operating the power windows o r
moon roof (if equipped)
Operate the power window or moon roof after checking to make su re that
there is no possibility of any passenger having any of their body parts
caught in the window or moon roof.
Also, do not allow children to operate the mechanical key. It is possible for
children and other passengers to get caught in the power window or moon
roof.
3

6537-2. Steps to take in an emergency
PRIUS_OM_OM47E09U_(U)
7
When trouble arises
■When recharging or replacing the 12-volt battery
●In some cases, it may not be possible to unlock the doors using the smart
key system when the 12-volt battery is discharged. Use the wire less remote
control or the mechanical key to lock or unlock the doors.
● The hybrid system may not start on the first attempt after the 12-volt battery
has recharged but will start normally after the second attempt. This is not a
malfunction.
● The power switch mode is memorized by the vehicle. When the 12- volt bat-
tery is reconnected, the system will return to the mode it was in before the
12-volt battery was discharged. Before disconnecting the 12-volt battery,
turn the power switch off.
If you are unsure what mode the power switch was in before the 12-volt bat-
tery discharged, be especially careful when reconnecting the 12 -volt battery.
● If the 12-volt battery discharges while the shift position is in P, it may not be
possible to shift the shift position to other positions. In thi s case, the vehicle
cannot be towed without lifting both front wheels because the f ront wheels
will be locked. ( P. 584)
■ When replacing the 12-volt battery
●Use a 12-volt battery that conforms to European regulations.
● Use a 12-volt battery that the case size is same as the previou s one (LN1),
20 hour rate capacity (20HR) is equivalent (45Ah) or greater, and perfor-
mance rating (CCA) is equivalent (295A) or greater.
• If the sizes differ, the 12-volt battery cannot be properly se cured.
• If the 20 hour rate capacity is low, even if the time period w here the vehi-
cle is not used is a short time, the 12-volt battery may discharge and the
hybrid system may not be able to start.
● For details, consult your Toyota dealer.

PRIUS_OM_OM47E09U_(U)
6938-2. Customization
8
Vehicle specifications
■HUD (Head-up display)* ( P. 1 5 8 )
*: If equipped
■
Door lock ( P. 185, 647)
■Smart key system and wireless remote control ( P. 186, 196)
FunctionDefault
settingCustomized setting
Route guidance*OnOffO––
123
FunctionDefault settingCustomized setting
Automatic door lockingShift position linkedSpeed linked–OOOff
Automatic door unlockingShift position linkedDriver’s door linked
–OO
Off
Unlocking using a mechanical
key
Driver’s door unlocked in
first step, all
doors
unlocked in
second step
All doors
unlocked in first step
––O
123
FunctionDefault settingCustomized setting
Operation signal (buzzer) 5Off
–OO
1 to 7
Operation signal (emergency
flashers) On
Off – O O
Time elapsed before the auto-
matic door lock function is
activated if a door is not
opened after being unlocked
60 seconds
Off
–OO30 seconds
120 seconds
Open door reminder buzzer
(when locking the vehicle)OnOff––O
123

694
PRIUS_OM_OM47E09U_(U)
8-2. Customization
■Smart key system (P. 1 9 6 )
*: This function can also be changed using the wireless remote control.
(P. 189)
■
Wireless remote control ( P. 1 8 6 )
FunctionDefault
settingCustomized setting
Smart key systemOnOff––O
Smart door unlocking*Driver’s doorAll the doors–OO
Time elapsed before unlock-
ing all the door when gripping
and holding the driver’s door
handle
2 secondsOff––O
Number of consecutive door
lock operations2 timesAs many as desired––O
123
FunctionDefault settingCustomized setting
Unlocking operation
Driver’s door unlocked in
first step, all doors
unlocked in
second step
All doors
unlocked in
first step
–OO
Wireless remote control On Off – – O
Locking operation when door
opened On Off – O O
123

PRIUS_OM_OM47E09U_(U)
6958-2. Customization
8
Vehicle specifications
■Power windows and moon roof* ( P. 218, 223)
*: If equipped
■
Reverse warning buzzer ( P. 257)
■Turn signal lever ( P. 261)
FunctionDefault
settingCustomized setting
Mechanical key linked opera-
tion (open)OffOn––O
Mechanical key linked opera-
tion (close)OffOn––O
Wireless remote control linked
operation (open only)OffOn––O
Wireless remote control linked
operation signal (buzzer)OnOff––O
123
FunctionDefault settingCustomized setting
Signal (buzzer) when the shift
position is in RIntermittentSingle––O
123
FunctionDefault settingCustomized setting
Times of flashing of the lane
change signal flashers3
Off
––O5
7
123

PRIUS_OM_OM47E09U_(U)
6998-2. Customization
8
Vehicle specifications
■Illumination (P. 4 5 8 )
*: If equipped
■
Seat belt reminder ( P. 597)
■Maintenance system
FunctionDefault
settingCustomized setting
Time elapsed before the inte-
rior lights turn off 15 secondsOff
–OO
7.5 seconds
30 seconds
Operation after the power
switch is turned offOnOff––O
Operation when the doors are
unlockedOnOff––O
Operation when you approach
the vehicle with the electronic
key on your person
OnOff––O
Footwell lighting*OnOff––O
Interior lights illumination con-
trolOnOff––O
123
FunctionDefault settingCustomized setting
Vehicle speed linked seat belt
reminder buzzerOnOff––O
123
Oil Maintenance
(U.S.A. only)Resetting the message indicating maintenance
is required: P. 506
Tire pressure warning
systemInitializing the tire p ressure warning system:
 P. 534

700
PRIUS_OM_OM47E09U_(U)
8-2. Customization
■Vehicle customization
●When the Speed linked door locking function and the Shift posit ion linked
door locking function are both on, the door lock operates as fo llows.
• When shifting the shift position to any position other than P, all the doors
will be locked.
• If the vehicle is started with all the doors locked, the Speed linked door locking function would not operate.
• If the vehicle is started with any door unlocked, the Speed linked door locking function will operate.
● When the smart key system is off, Smart door unlocking cannot b e custom-
ized.
● When the doors remain closed after unlocking the doors and the automatic
door lock function is activated, the signals will be generated in accordance
with the operation signal (buzzer) and the operation signal (em ergency
flashers) settings.
■ In the following situations, customize mode will automatically be turned
off.
● A warning message appears after the customize mode screen is di splayed.
● The power switch is turned off.
● The vehicle begins to move while the customize mode screen is d isplayed.
WARNING
■Cautions during customization
As the hybrid system needs to be operating during customization, ensure
that the vehicle is parked in a place with adequate ventilation. In a closed
area such as a garage, exhaust gases including harmful carbon monoxide
(CO) may collect and enter the vehicle. This may lead to death or a serious
health hazard.
NOTICE
■ During customization
To prevent 12-volt battery discharge, ensure that the hybrid sy stem is oper-
ating while customizing features.

720What to do if... (Troubleshooting)
PRIUS_OM_OM47E09U_(U)
What to do if... (Troubleshooting)
●If you lose your mechanical keys, new genuine mechanical keys can be
made by your Toyota dealer. ( P. 181)
●If you lose your electronic keys, the risk of vehicle theft inc reases signifi-
cantly. Contact your Toyota dealer immediately. ( P. 184)
●Is the electronic key battery weak or depleted? (P. 560)
●Is the power switch in ON mode?
When locking the doors, turn the power switch off. ( P. 247)
●Is the electronic key left inside the vehicle?
When locking the doors, make sure that you have the electronic key on
your person.
●The function may not operate properly due to the condition of t he radio
wave. ( P. 198)
●Is the child-protector lock set?
The rear door cannot be opened from inside the vehicle when the lock is
set. Open the rear door from outside and then unlock the child-protector
lock. ( P. 188)
If you have a problem, check the following before contacting
your Toyota dealer.
The doors cannot be locked, unlocked, opened or closed
You lose your keys
The doors cannot be locked or unlocked
The rear door cannot be opened

721What to do if... (Troubleshooting)
PRIUS_OM_OM47E09U_(U)
●Did you press the power switch while firmly depressing the brake pedal?
(P. 245)
●Is the shift position in P? ( P. 256)
●Is the electronic key anywhere detectable inside the vehicle? ( P. 196)
●Is the electronic key battery weak or depleted?
In this case, the hybrid system can be started in a temporary way.
(P. 648)
●Is the 12-volt battery discharged? ( P. 650)
●Is the window lock switch pressed?
The power windows except for the one at the driver’s seat canno t be oper-
ated if the window lock switch is pressed. ( P. 218)
●The auto power off function will be operated if the vehicle is left in
ACCESSORY or ON mode (the hybrid system is not operating) for a
period of time. ( P. 247)
If you think something is wrong
The hybrid system does not start
The windows do not open or close by operating the power
window switches
The power switch is turned off automatically

722What to do if... (Troubleshooting)
PRIUS_OM_OM47E09U_(U)
●The seat belt reminder light is flashing
Are the driver and the front passenger wearing the seat belts? (P. 597)
●The parking brake indicator is on
Is the parking brake released? ( P. 262)
Depending on the situation, other types of warning buzzer may a lso sound.
( P. 592, 603)
●Is the electronic key left inside the vehicle?
Check the message on the multi-information display. ( P. 603)
●When a warning light turns on or a warning message is displayed , refer to
P. 592, 603.
A warning buzzer sounds during driving
A warning buzzer sounds w hen leaving the vehicle
A warning light turns on or a warning message is displayed