2012 TOYOTA PRIUS C battery

5
When trouble arises
447
5-2. Steps to take in an emergency
(Flashes)
Indicates that the
hybrid battery (trac-
tion battery) power
has dropped because
a long period of time
has elapsed after
shifting the shift lever
to N
A buzzer also sounds. Shift the shift lever to P
and restart the hybrid
system when starting
the vehicle.
(Flashes) Indicates that the
driver’s door was
opened with the shift
position in N, D or B
A buzzer also sounds. Shift the shift lever to P.
(Flashes) Indicates that the
accelerator pedal is
depressed while the
shift position is in N
A buzzer also sounds. Release the accelera-
tor pedal and shift the
shift lever to D, B or R.
(Flashes) Indicates that the
engine switch is
turned to the “ACC”
or “LOCK” position
(vehicles without a
smart key system) or
the “POWER” switch
is turned to ACCES-
SORY mode or turned
off (vehicles with a
smart key system)
and the driver's door
is opened while the
lights are turned on
A buzzer also sounds. Turn the lights off.
Warning messageDetailsCorrection procedure

448 5-2. Steps to take in an emergency
Indicates that the EV
drive mode is not
available
*2
A buzzer also sounds.
The reason the EV
drive mode is not
available (the vehicle
is idling, battery
charge is low, speed is
higher than the EV
drive mode operating
speed range, acceler-
ator pedal is
depressed too much)
may be displayed.Use the EV drive mode
when it becomes avail-
able.
(Flashes 3
times) Indicates that the EV
drive mode has been
automatically can-
celled
*2
A buzzer also sounds.
The reason the EV
drive mode is not
available (the battery
charge is low, speed is
higher than the EV
drive mode speed
range, accelerator
pedal is depressed too
much) may be dis-
played.
Drive the vehicle for a
while.
*1: Refer to the separate “Scheduled Maintenance Guide” or “Owner’s
Manual Supplement” for the maintena nce interval applicable to your
vehicle.
*2: For the EV drive mode operating conditions: P. 170
Warning messageDetailsCorrection procedure

5
When trouble arises
455
5-2. Steps to take in an emergency
Once
The electronic
key has a low
battery.Replace the
electronic key
battery.
(
P. 397)
Once
(Flashes)The driver's
door was
opened and
closed with the
“POWER”
switch turned off
and then the
“POWER”
switch was put
in ACCES-
SORY mode
twice without
the hybrid sys-
tem being
started.
Press the
“POWER”
switch while
depressing the
brake pedal.
During a hybrid
system starting
procedure in the
event that the
electronic key
was not func-
tioning properly
( P. 473), the
“POWER”
switch was
touched with
the electronic
key. Press the
“POWER”
switch within 10
seconds of the
buzzer sound-
ing.
Interior
buzzerExterior buzzerWarning messageDetailsCorrection procedure

5
When trouble arises
469
5-2. Steps to take in an emergency
If the hybrid system will not start
Reasons for the hybrid system not starting vary depending on the
situation. Check the following and perform the appropriate proce-
dure:
■ The hybrid system will not start even though the correct
starting procedure is being followed. ( P. 158, 162)
One of the following may be the cause of the problem:
● Vehicles with a smart key system: The electronic key may not
be functioning properly. ( P. 474)
● There may not be sufficient fuel in the vehicle’s tank.
Refuel the vehicle. ( P. 105)
● Vehicles with immobilizer sy stem: There may be a malfunc-
tion in the immobilizer system. ( P. 1 1 0 )
● There may be a malfunction in the steering lock system.
● Vehicles with a smart key syst em: The hybrid system may be
malfunctioning due to an electrical problem such as an open
circuit or a blown fuse. However, depending on the type of
malfunction, an interim measure is available to start the hybrid
system. ( P. 470)
■ The interior lights and headlights are dim, or the horn does
not sound or sounds at a low volume.
One of the following may be the cause of the problem:
●The 12-volt battery may be discharged. ( P. 475)
● The 12-volt battery terminal c onnections may be loose or cor-
roded.

470 5-2. Steps to take in an emergency
Emergency start function (vehicles with a smart key system)When the hybrid system does not start, the following steps can be
used as an interim measure to start the hybrid system if the
“POWER” switch is functioning normally: Shift the shift lever to P.
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 headlights do not turn on, or the horn
does not sound.
One of the following may be the cause of the problem:
●One or both of the 12-volt ba ttery terminals may be discon-
nected.
● The 12-volt battery may be discharged. ( P. 475)
Contact your Toyota dealer if the problem cannot be repaired, or if
repair procedures are unknown.
STEP1
STEP2
STEP3
STEP4

5
When trouble arises
473
5-2. Steps to take in an emergency
If the electronic key does not operate properly (vehicles with a smart key system)
Locking and unlocking the doorsUse the mechanical key (P.
44) in order to perform the fol-
lowing operations (driver’s door
only):
Unlocks the doors
Locks all the doors
Turning the key rearward unlocks
the driver’s door. Turning the key
once again within 5 seconds
unlocks the other doors.
If communication between the electronic key and vehicle is inter-
rupted ( P. 55) or the electronic key cannot be used because the
battery is depleted, the smart key system and wireless remote con-
trol cannot be used. In such cases, the doors can be opened and the
hybrid system can be started by following the procedure below.

474 5-2. Steps to take in an emergency
Starting the hybrid systemEnsure that the shift lever is in P and depress the brake pedal. Touch the Toyota emblem side of
the electronic key to the
“POWER” switch.
When the electronic key is
detected, a buzzer sounds and
the “POWER” switch will turn to
ON mode.
Firmly depress the brake pedal and check that is dis-
played on the multi-information display.
Press the “POWER” switch.
In the event that the “POWER” swit ch still cannot be operated, con-
tact your Toyota dealer.
STEP1
STEP2
■ Stopping the hybrid system
Shift the shift lever 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 recommended that the
electronic key battery be replaced immediately when the battery is depleted.
(P. 397)
■ If the doors cannot be locked or unlocked by the smart key system
Lock and unlock the doors by the mechanical key or wireless remote contr\
ol.
■ When the electronic key does not work properly
Check if battery-saving mode is set. If it is set, cancel the function.
(P. 54)
STEP3
STEP4

5
When trouble arises
475
5-2. Steps to take in an emergency
If the vehicle 12-volt batter y is discharged
The following procedures may be used to start the hybrid system if
the vehicle’s 12-volt battery is discharged.
You can also call your Toyota deal er or a qualified repair shop.
If you have a set of jumper (or booster) cables and a second vehi-
cle with a 12-volt battery, you can jump start your vehicle by follow-
ing the steps below.
Remove the 12-volt battery
cover under the rear right
seat. (P. 375)
Connect the jumper cables accord ing to the following procedure:
Connect a positive jumper cable clamp to the positive (+) battery
terminal on your vehicle.
Connect the clamp on the other e nd of the positive cable to the
positive (+) battery termin al on the second vehicle.
Connect a negative cable clamp to the negative (-) battery termi-
nal on the second vehicle.
Connect the clamp at the other en d of the negative cable to the
negative (-) battery terminal on your vehicle as shown in the
illustration.
STEP1
STEP2