2010 TOYOTA PRIUS Power steering

160 2-1. Driving procedures
PRIUS_U (OM47668U) U.S.A.
NOTICE
■While driving the vehicle
Do not use the accelerator pedal or depress accelerator and brake pedals
together to hold the vehicle on a hill.
■ When parking the vehicle
Always push the “P” position switch. Failure to do so may cause the vehicle
to move or the vehicle may accelerate suddenly if the accelerator pedal is
accidentally depressed.
■ Avoiding damage to vehicle parts
● Do not turn the steering wheel fully in either direction and hold it there for a
long time. 
Doing so may damage the power steering motor.
● When driving over bumps in the road, drive as slowly as possible to avoid
damaging the wheels, underside of the vehicle, etc.
■ If you hear a squealing or scraping noise (brake pad wear limit indica-
tors)
Have your Toyota dealer check and replace the brake pads as soon as pos-
sible. 
The rotor damage can result if the pads are not replaced when needed.
It is dangerous to drive the vehicle when the wear limits of the brake pads
and/or that of the brake discs are exceeded.

167
2-1. Driving procedures
2
When driving
PRIUS_U (OM47668U) U.S.A.
■
Note for the entry function
 P. 50, 59
■ Leak detection pump
Several hours after the engine is turned off, you may hear a sound coming
from underneath the luggage compartment for several minutes. 
This is normal operation and does not indicate a malfunction.
CAUTION
■ When starting the hybrid system
Always start the hybrid system while sitting in the driver’s seat. Do not press
the accelerator pedal while starting the hybrid system under any circum-
stances. 
Doing so may cause an accident resulting in death or serious injury.
■ Stopping the hybrid system in an emergency
If you want to stop the hybrid system in an emergency while driving the vehi-
cle, push and hold the “POWER” switch for more than 3 seconds. 
However, do not touch the "POWER" switch while driving except in an emer-
gency. Turning the hybrid system off while driving will not cause loss of
steering or braking control, but the power assist to these systems will \
be lost.
This will make it more difficult to steer and brake, so you should pull over
and stop the vehicle as soon as it is safe to do so.
NOTICE
■ To prevent 12 volt battery discharge
Do not leave the “POWER” switch in ACCESSORY or ON mode for long
periods if the hybrid system is not operating.
■ When starting the hybrid system
If the hybrid system becomes difficult to start or stalls frequently, have the 12
volt battery and electronic key battery checked immediately.

245
2-4. Using other driving systems
2
When driving
PRIUS_U (OM47668U) U.S.A.
Driving assist systems
To help enhance driving safety and performance, the following sys-
tems operate automatically in res ponse to various driving situations.
Be aware, however, that these systems are supplementary and
should not be relied upon too h eavily when operating the vehicle.
■ABS (Anti-lock Brake System)
Helps to prevent wheel lock when the brakes are applied suddenly, or if
the brakes are applied while driving on a slippery road surface.
■Brake assist
Generates an increased level of braking force after the brake pedal is
depressed, when the system detects a panic stop situation.
■Enhanced VSC (Vehicle Stability Control)
Helps the driver to control skidding when swerving suddenly or turning
on slippery road surfaces.
■TRAC (Traction Control)
Maintains drive power and prevents the front wheels from spinning
when starting the vehicle or accelerating on slippery roads.
■Hill-start assist control
P. 243
■ EPS (Electric Power Steering)
Employs an electric motor to reduce the amount of effort needed to turn
the steering wheel.
■Pre-Collision System (if equipped)
P. 249

247
2-4. Using other
driving systems
2
When driving
PRIUS_U (OM47668U) U.S.A.
■Reduced effectiveness of EPS
The effectiveness of EPS is reduced to prevent the system from overheating
when there is frequent steering input over an extended period of time. The
steering wheel may feel heavy as a result. Should this occur, refrain from
excessive steering input or stop the vehicle and turn the hybrid system off.
The system should return to normal within 10 minutes.
CAUTION
■The ABS does not opera te effectively when
● The limits of tire gripping performance have been exceeded.
● The vehicle hydroplanes while driving at high speed on the wet or slick
road.
■ Stopping distance when the ABS is ope rating on the wet or slick roads
The ABS is not designed to shorten the vehicle’s stopping distance. Always
maintain a safe distance from the vehicle in front of you in the following situ-
ations.
● When driving on dirt, gravel or snow-covered roads
● When driving with tire chains
● When driving over bumps in the road
● When driving over roads with potholes or roads with uneven pavement
■ TRAC may not operate effectively when
Directional control and power may not be achievable while driving on slip-
pery road surfaces, even if the TRAC is operating. 
Do not drive the vehicle in conditions where stability and power may be lost.

323
3-2. Using the audio system
3
Interior features
PRIUS_U (OM47668U) U.S.A.
Using the steering switches
Turning on the powerPress when the audio system is turned off.
The audio system can be turned off by holding the switch down for 1 sec-
ond or more.
Changing the audio sourcePress when the audio system is turned on. The audio source
changes as follows each time the bu tton is pressed. If a CD is not
inserted, that mode will be skipped.
FM (1, 2) CD player AM SAT (1, 2, 3)
Some audio features can be cont rolled using the switches on the
steering wheel.
Vo l u m e
Power on, select audio
source
Radio: Select radio stations
CD: Select tracks, discs and folder
ITO32P108

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

468 4-3. Do-it-yourself maintenance
PRIUS_U (OM47668U) U.S.A.■
Left side instrument panel
FUSEAmpereCircuit
1 CIG 15A Power outlets
2 ECU-ACC 10AMultiplex communication system,
outside rear view mirrors, driver
support system, audio system,
navigation system
3 PWR OUTLET 15A Power outlets
4 SEAT HTR FR 10A Seat heater
5 SEAT HTR FL 10A Seat heater
6 DOOR NO.1 25A Power door lock system
7 PSB 30A Pre-Collision System
8 PWR SEAT FR 30A Front seat lumber support
9 DBL LOCK 25A Tilt & telescopic steering
10 FR FOG 15A Front fog lights
11 PWR SEAT FL 30A Front seat lumber support
12 OBD 7.5A On-board diagnosis system
13 RR FOG 7.5A No circuit
14 STOP 10AStop lights, high mounted stop-
light, brake system, power win-
dows, driver support system
ITO43P133
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