battery TOYOTA PRIUS PLUS 2012 Repair Manual

438 4-3. Do-it-yourself maintenance
PRIUS +_OM_OM47821E_(EE)
FUSEAmpereCircuit
12 P CON MAIN 7.5AP position control system, trans-
mission
13 AM2 7.5A Power management system
14 ECU-B2 7.5A Smart entry & start system
15 MAYDAY 10A No circuit
16 ECU-B3 10A Air conditioning system
17 TURN & HAZ 10A Turn signal lights
18 ETCS 10AMultiport fuel injection system/
sequential multiport fuel injection
system
19ABS MAIN
NO.120A Anti-lock brake system
20 P/I 2 40AHorn, right-hand headlight (low
beam), left-hand headlight (low
beam), back-up lights
21 ABS MTR 1 30A Anti-lock brake system
22 ABS MTR 2 30A Anti-lock brake system
23 H-LP HI MAIN 20AH-LP HI RH, H-LP HI LH,
headlight switch, daytime running
light system
24 HV BATT 10AHybrid system, hybrid battery
(traction battery)
25 DRL 7.5A Daytime running light system
26 P/I 1 60A IG2, EFI MAIN, BATT FAN
27 EPS 60A Electric power steering
28 PCU 10A Inverter and converter
29 IGCT NO.2 10AHybrid system, P position control
system, inverter and converter

439 4-3. Do-it-yourself maintenance
4
Maintenance and care
PRIUS +_OM_OM47821E_(EE)
FUSEAmpereCircuit
30 MIR HTR 10A Outside rear view mirror defoggers
31 RAD NO.1 15A Audio system, navigation system
32 DOME 10ADoor courtesy lights, personal
lights, interior lights, front foot
lights, vanity lights, inside rear
view mirror, overhead console
33 ECU-B 7.5ASmart entry & start system, multi-
plex communication system, per-
sonal lights, gauges and meters
34 H-LP LH HI 10A Left-hand headlight (high beam)
35 H-LP RH HI 10A Right-hand headlight (high beam)
36 EFI NO.2 10AMultiport fuel injection system/
sequential multiport fuel injection
system
37 IGCT NO.3 10A Cooling system
38 SPARE 30A Spare fuse
39 SPARE 10A Spare fuse
40 SPARE 7.5A Spare fuse
41 EFI MAIN 20AMultiport fuel injection system/
sequential multiport fuel injection
system, EFI NO.2
42 BATT FAN 10A Battery cooling fan
43 IG2 20AMultiport fuel injection system/
sequential multiport fuel injection
system, MET-IGN, IGN, hybrid
system

5When trouble arises
459
PRIUS +_OM_OM47821E_(EE)
5-1. Essential information
Emergency flashers .......... 460
If your vehicle needs
to be towed ..................... 461
If you think something is
wrong .............................. 468
5-2. Steps to take
in an emergency
If a warning light turns
on or a warning
buzzer sounds ................ 469
If you have a flat tire
(vehicles with
spare tire) ....................... 482
If you have a flat tire
(vehicles without
a spare tire) .................... 494
If the hybrid system
will not start..................... 516
If you lose your keys ......... 518
If the electronic key does not
operate properly ............. 519
If the 12-volt battery is
discharged ...................... 522
If your vehicle
overheats ........................ 528
If the vehicle becomes
stuck ............................... 534
If your vehicle has
to be stopped in
an emergency ................. 536

460
PRIUS +_OM_OM47821E_(EE)
5-1. Essential information
Emergency flashers
NOTICE
To prevent 12-volt battery discharge
Do not leave the emergency flashers on longer than necessary when the
hybrid system is not operating.
Use the emergency flashers if the vehicle malfunctions or is
involved in an accident.
Press the switch to flash all
the turn signal lights. To turn
them off, press the switch
once again.

5
473 5-2. Steps to take in an emergency
When trouble arises
PRIUS +_OM_OM47821E_(EE)
Warning lightWarning light/Details
Parking lock system warning light (warning buzzer)
Indicates a malfunction in the P position control system
• In this situation, there is a possibility that the parking
lock mechanism will not work. When parking, park the
vehicle on a flat surface and apply the parking brake
securely.
• The “POWER” switch may not be turned off. If this hap-
pens, applying the parking brake will enable the switch
to be turned off.
Parking lock system warning message (warning
buzzer)
Indicates a malfunction in the P position control system
when the vehicle is stopped
• In this situation, there is a possibility that the parking
lock mechanism will not work. When parking, park the
vehicle on a flat surface and apply the parking brake
securely.
• The “POWER” switch may not be turned off. If this hap-
pens, applying the parking brake will enable the switch
to be turned off.
Hybrid battery indicator light
The hybrid battery (traction battery) will soon need to be
inspected or replaced
Have the hybrid battery (traction battery) inspected by
any authorized Toyota dealer or repairer, or another
duly qualified and equipped professional immediately.
*

5
475 5-2. Steps to take in an emergency
When trouble arises
PRIUS +_OM_OM47821E_(EE)
Follow the correction procedures.
After taking the specified steps to correct the suspected problem,
check that the warning light goes off.
Warning lightWarning light/DetailsCorrection procedure

(Flashes)P position request indicator
light (warning buzzer)
The amount of charge remain-
ing in the hybrid battery (trac-
tion battery) has fallen because
the shift position has been left
in N for a long timeBecause recharging
is not possible when
the shift position is in
N, shift the shift posi-
tion to P when park-
ing the vehicle for a
long time.
The driver’s door has been
opened while the shift position
is in N, D or B
Shift the shift posi-
tion to P. An attempt has been made to
start the hybrid system while
the shift position is in anything
other than P
Hybrid system overheat warn-
ing light (warning buzzer)
The hybrid system has over-
heated
This light may come on when
driving under severe operating
conditions. (For example, when
driving up a long steep hill.)Stop and check.
(P. 528)

476 5-2. Steps to take in an emergency
PRIUS +_OM_OM47821E_(EE)
Warning lightWarning light/DetailsCorrection procedure

(Only outer
frame flashes)Low hybrid battery (traction
battery) warning light (warning
buzzer)
Hybrid battery (traction battery)
level becomes low because the
shift position is in N for long
timeBecause recharging
is not possible when
the shift position is in
N, shift the shift posi-
tion to P when park-
ing the vehicle for a
long time.

(Turns on)
(If equipped)Pre-crash safety system warn-
ing light
Indicates that the PCS is not
currently functional because
the grille or the radar sensor is
dirty, or the system has over-
heated.• Check the grille and
the sensor and clean
them if they are dirty.
• In case of overheat-
ing, the system will
become functional
once the system
cools down.
Open door warning light
(warning buzzer)
*1
Indicates that a door is not fully
closedCheck that all the
doors are closed.
Low fuel level warning light
Indicates remaining fuel is
approximately 6.0 L (1.6 gal.,
1.3 Imp.gal.) or lessRefuel the vehicle.

478 5-2. Steps to take in an emergency
PRIUS +_OM_OM47821E_(EE)
Electric power steering system warning light (warning buzzer)
When the 12-volt battery charge becomes insufficient or the voltage tempo-
rarily drops, the electric power steering system warning light may come on
and the warning buzzer sounds.
If the malfunction indicator lamp comes on while driving
The malfunction indicator lamp will come on if the fuel tank becomes com-
pletely empty. If the fuel tank is empty, refuel the vehicle immediately. The
malfunction indicator lamp will go off after several trips.
Customization
The vehicle speed linked seat belt reminder buzzer can be disabled.
(Customizable features P. 554) However, Toyota recommends that the
seat belt reminder buzzer be operational to alert the driver and front passen-
ger when seat belts are not fastened.
CAUTION
If both the ABS and the brake system warning lights remain on
Stop your vehicle in a safe place immediately and contact any authorized
Toyota dealer or repairer, or another duly qualified and equipped profes-
sional. The vehicle will become extremely unstable during braking, and the
ABS system may fail, which could cause an accident resulting in death or
serious injury.
When the electric power steering system warning light comes on
The steering wheel may become extremely heavy.
If the steering wheel becomes heavier than usual when operating, hold
firmly and operate using more force than usual.

516
5-2. Steps to take in an emergency
PRIUS +_OM_OM47821E_(EE)
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. 214)
One of the following may be the cause of the problem:
The electronic key may not be functioning properly.
*
(P. 519)
There may not be sufficient fuel in the vehicle’s tank.
Refuel the vehicle.
There may be a malfunction in the immobilizer system.
*
(P. 143)
There may be a malfunction in the P position control system.
*
(P. 219, 473, 473)
*: It may not be possible to shift the shift position from P to other posi-
tion.
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. 522)
The 12-volt battery terminal connections may be loose or cor-
roded.

5
517 5-2. Steps to take in an emergency
When trouble arises
PRIUS +_OM_OM47821E_(EE)
Emergency start function
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:
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 any
authorized Toyota dealer or repairer, or another duly qualified and
equipped professional.
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 battery terminals may be discon-
nected.
The 12-volt battery may be discharged. (P. 522)
Contact any authorized Toyota dealer or repairer, or another duly quali-
fied and equipped professional if the problem cannot be repaired, or if
repair procedures are unknown.
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