2010 TOYOTA PRIUS fuel

466 4-3. Do-it-yourself maintenance
PRIUS_U (OM47668U) U.S.A.
FUSEAmpereCircuit
12 AM2 7.5A Power windows
13 ECU-B2 7.5A Smart key system
14 MAYDAY 10A No circuit
15 ECU-B3 10A Air conditioning system
16 TURN & HAZ 10A Turn signal lights
17 ETCS 10AMultiport fuel injection system/
sequential multiport fuel injection
system
18 ABS MAIN
NO.1 20A Anti-lock brake system
19 P/I 2 40AParking control system, horn,
right-hand headlight (low beam),
left-hand headlight (low beam),
back-up lights
20 ABS MTR 1 30A Anti-lock brake system
21 ABS MTR 2 30A Anti-lock brake system
22 H-LP HI MAIN 20A H-LP HI RH, H-LP HI LH,
headlight switch, daytime running
light system
23 P/I 1 60A IG2, EFI MAIN, BATT FAN
24 EPS 60A Electric power steering
25 PCU 10A Inverter and converter
26 IGCT NO.2 10A Hybrid system, parking control
system, power windows, inverter
and converter

467
4-3. Do-it-yourself maintenance
4
Maintenance and care
PRIUS_U (OM47668U) U.S.A.
FUSEAmpereCircuit
27 MIR HTR 10A Outside rear view mirror defoggers
28 RAD NO.1 15A Audio system, navigation system
29 DOME 10ADoor courtesy lights, personal
lights, interior lights, front foot
lights, vanity lights, inside rear
view mirror, garage door opener,
electric power steering
30 ECU-B 7.5ASmart key system, multiplex com-
munication system, personal
lights, gauges and meters
31 H-LP LH HI 10A Left-hand headlight (high beam)
32 H-LP RH HI 10A Right-hand headlight (high beam)
33 EFI NO.2 10AMultiport fuel injection system/
sequential multiport fuel injection
system
34 IGCT NO.3 10A Cooling system
35 SPARE 30A Spare fuses
36 SPARE 15A Spare fuses
37 SPARE 7.5A Spare fuses
38 EFI MAIN 20AMultiport fuel injection system/
sequential multiport fuel injection
system, EFI NO.2
39 BATT FAN 10A Battery cooling fan
40 IG2 20AMultiport fuel injection system/
sequential multiport fuel injection
system, MET-IGN, IGN, power
windows

470 4-3. Do-it-yourself maintenance
PRIUS_U (OM47668U) U.S.A.
FUSEAmpereCircuit
25 RR WIP 20A Rear window wiper and washer
26 WIP 30A Windshield wipers
27 MET 7.5A Gauges and meters
28 IGN 10ABrake system, driver support sys-
tem, multiport fuel injection sys-
tem/sequential multiport fuel
injection system, SRS airbag sys-
tem, occupant detection sensor,
power windows, smart key system
29 PANEL 10AAir conditioning system, emer-
gency flashers, seat heaters,
transmission, “P” position switch,
navigation system, Solar Ventila-
tion System, Remote Air Condi-
tioning System, advanced parking
guidance system, headlight
cleaner, front passenger’s seat
belt reminder light, headlight level-
ing system, glove box light, clock,
audio system
30 TAIL 10AHeadlight leveling system, park-
ing lights, tail lights, license plate
lights, front fog lights, side marker
lights

5
When trouble arises
499
5-2. Steps to take in an emergency
PRIUS_U (OM47668U) U.S.A.
Follow the correction procedures.
After taking the specified steps to correct the suspected problem,
check that the warning light turns off.
Warning lightWarning light/DetailsCorrection procedure
Open door warning light 
(warning buzzer)
*1
A door or a back door is
not fully closed.
Check that all
doors and the back
door are closed.
Low fuel level warning
light Remaining fuel
(Approximately 1.6 gal.
[6.0 L, 1.3 Imp.gal.] or
less) Refuel the vehicle.
Driver’s seat belt
reminder light (warning
buzzer)
*2
Warns the driver to fasten
his/her seat belt. Fasten the seat
belt.
(On the instrument panel)
Front passenger’s seat
belt reminder light
(warning buzzer)
*2
Warns the front passen-
ger to fasten his/her seat
belt.Fasten the seat
belt.

5
When trouble arises
501
5-2. Steps to take in an emergency
PRIUS_U (OM47668U) U.S.A.
*1: Open door warning buzzer:
The open door warning buzzer sounds to alert one or more of the doors is
not fully closed (with the vehicle hav
ing reached a speed of 3 mph [5 km/h]).
*2: Driver’s and front passenger’s seat belt reminder buzzer:
The driver’s and front passenger’s seat belts reminder sounds to alert the
driver and front passenger that his or her seat belt is not fastened. The
buzzer sounds intermittently for 10 seconds after the vehicle has reached a
speed of at lest 12 mph (20 km/h). Then, if the seat belt is still unfastened,
the buzzer will sound in a different tone for 20 more seconds.
■If the malfunction indicator lamp comes on while driving
First check whether the fuel tank cap is loose. If it is, tighten it securely.
The light will go off after taking several driving trips. 
If the light does not go off even after several trips, contact your Toyota dealer
as soon as possible.
■ Electric power steering warning light
When the voltage is low or drops, the electric power steering warning light
may come on.

506 5-2. Steps to take in an emergency
PRIUS_U (OM47668U) U.S.A.
CAUTION
■Maintenance of the tires
Each tire, including the spare (if provided), should be checked monthly
when cold and inflated to the inflation pressure recommended by the
vehicle manufacturer on the vehicle placard or tire inflation pressure
label (tire and load information label). (If your vehicle has tires of a differ-
ent size than the size indicated on th e vehicle placard or tire inflation
pressure label [tire and load informa tion label], you should determine the
proper tire inflation pr essure for those tires.)
As an added safety feature, your v ehicle has been equipped with a tire
pressure monitoring system (TPMS-tire pressure warning system) that
illuminates a low tire pressure telltal e (tire pressure warning light) when
one or more of your tires is significantly under-inflated. Accordingly,
when the low tire pressu re telltale (tire pressure warning light) illumi-
nates, you should stop and check your tires as soon as possible, and
inflate them to the proper pressure. Driving on a significantly under-
inflated tire causes the tire to overheat and can lead to tire failure.
Under-inflation also reduces fuel effi ciency and tire tread life, and may
affect the vehicle’s handling and stopping ability.
Please note that the TPMS (tire pressure warning system) is not a sub-
stitute for proper tire main tenance, and it is the driver’s responsibility to
maintain correct tire pressure, even if under-inflation has not reached the
level to trigger illu mination of the TPMS low ti re pressure telltale (tire
pressure warning light).

5
When trouble arises
525
5-2. Steps to take in an emergency
PRIUS_U (OM47668U) U.S.A.
■
Compact spare tire
The compact spare tire saves space in your luggage compart-
ment, and its lighter weight helps to enhance fuel economy and
permits easier installation in case of a flat tire.
The compact spare tire is
designed for temporary emer-
gency use only.

538
5-2. Steps to take in an emergency
PRIUS_U (OM47668U) U.S.A.
If the hybrid system will not start
If the hybrid system still does not start after following the correct
starting procedure (
P. 164), confirm the following points.
■ The hybrid system will not start even if you are carrying the
correct key.
One of the following may be the cause of the problem.
●There may not be sufficient fuel in the vehicle’s tank. 
Refuel the vehicle.
● The electronic key battery may be discharged. ( P. 541)
● The hybrid system may be malfunct ioning due to an electrical
problem such as an open circuit or a blown fuse. However,
depending on the type of malfunc tion, an interim measure is
available to start the hybrid system. ( P. 539)
● There may be a malfunction in the immobilizer system. 
( P. 108)
■ The interior lights and headlight s 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. 543)
● The 12 volt battery terminal c onnections may be loose or cor-
roded.