2010 TOYOTA PRIUS brake sensor

207
2-3. Operating the lights and windshield wipers
2
When driving
PRIUS_U (OM47668U) U.S.A.
Turning on the high beam headlights
With the headlights on, push
the lever forward to turn on the
high beams.
Pull the lever back to the center
position to turn the high beams
off.
Pull the lever toward you to
turn on the high beams.
Release the lever to turn them off.
You can flash the high beams
with the headlights on or off.
ITO23P104a
■Daytime running light system (if equipped)
To make your vehicle more visible to other drivers, the headlights turn on
automatically (at a reduced intensity) whenever the hybrid system is started
and the parking brake is released. Daytime running lights are not designed
for use at night.
■ Headlight control sensor (if equipped)
The sensor may not function properly if
an object is placed on the sensor, or any-
thing that blocks the sensor is affixed to
the windshield. 
Doing so interferes with the sensor
detecting the level of ambient light and
may cause the automatic headlight con-
trol system to malfunction.
ITO23P105

229
2-4. Using other
driving systems
2
When driving
PRIUS_U (OM47668U) U.S.A.
CAUTION
■Situations unsuitable for dynamic radar cruise control
Do not use dynamic radar cruise control in any of the following situations.
Doing so may result in inappropriate speed control and could cause an acci-
dent resulting in death or serious injury.
● In heavy traffic
● On roads with sharp bends
● On winding roads
● On slippery roads, such as those covered with rain, ice and snow
● On steep downhills, or where there are sudden changes between sharp up
and down gradients 
Vehicle speed may exceed the set speed when driving down a steep hill.
● At entrances to expressways
● When weather conditions are bad enough that they may prevent the sen-
sors from functioning correctly (fog, snow, sandstorm, heavy rain, etc.)
● When an approach warning buzzer can be heard often
■ When the sensor may not be corr ectly detecting the vehicle ahead
Apply the brakes as necessary when any of the following types of vehicles
are in front of you. 
As the sensor may not be able to correctly detect these types of vehicles,
the approach warning ( P. 227) will not be activated, and a fatal or serious
accident may result.
● Vehicles that cut in suddenly
● Vehicles traveling at low speeds
● Vehicles that are not moving
● Vehicles with small rear ends (trailers with no load on board etc.)
● Motorcycles traveling in the same lane

230 2-4. Using other driving systems
PRIUS_U (OM47668U) U.S.A.
CAUTION
■Conditions under which the vehicle -to-vehicle distance control may
not function correctly
Apply the brakes as necessary in the following conditions as the radar sen-
sor may not be able to correctly detect vehicles ahead, and a fatal or serious
accident may result:
● When water or snow thrown up by the surrounding vehicles hinders the
functioning of the sensor
● When your vehicle is pointing upwards (caused by a heavy load in the lug-
gage compartment etc.)
● When the road curves or when the lanes are narrow
● When steering wheel operation or your position in the lane is unstable
● When the vehicle ahead of you decelerates suddenly
■ Handling the radar sensor
Observe the following to ensure the cruise control system can function effec-
tively. 
Otherwise, the system may not function correctly and could result in an acci-
dent.
● Keep the sensor and front grille cover clean at all times. 
Clean the sensor and front grille cover with a soft cloth so you do not mark
or damage them.
● Do not subject the sensor or surrounding area to a strong impact . 
If the sensor moves even slightly off position, the system may malfunction.
If the sensor or surrounding area is subject to a strong impact, always
have the area inspected and adjusted by a Toyota dealer.
● Do not disassemble the sensor.
● Do not attach accessories or stickers to the sensor, grille cover or sur-
rounding area.
● Do not modify or paint the sensor and grille cover.
● Do not replace them with non-genuine parts.

249
2-4. Using other driving systems
2
When driving
PRIUS_U (OM47668U) U.S.A.
Pre-Collision System
: If equipped
Safety systems such as the brakes and seat belts are automati-
cally engaged to lessen impact and in juries to occupants as well as
vehicle damage when the radar sensor detects an unavoidable
frontal collision.
■ Pre-collision seat belts
If the pre-collision s ensor detects that a co llision is unavoidable,
the pre-collision system will retract the seat belt before the colli-
sion occurs. 
The same will happen if the driver makes an emergency braking
or loses control of the vehicle. ( P. 8 6 )
■ Pre-collision brake assist
When there is a high possibility of a frontal collision, the system
applies greater braking force in relation to how strongly the
brake pedal is depressed.
■ Pre-collision braking
When there is a high possibility of a frontal collision, the system
warns the driver using a warning light, warning display and
buzzer. If the system determines that a collision is unavoidable,
the brakes are auto matically applied to reduce the collision
speed. Pre-collision braking can be disabled using the pre-colli-
sion braking off button.

251
2-4. Using other
driving systems
2
When driving
PRIUS_U (OM47668U) U.S.A.
■Obstacles not detected
The sensor cannot detect plastic obstacles such as pylons. There may also
be occasions when the radar sensor cannot detect pedestrians, animals,
bicycles, motorcycles, trees, or snowdrifts.
■ The pre-collision system is operational when
● Pre-collision seat belts:
• Vehicle speed is above 3 mph (5 km/h).
• The relative speed difference between your vehicle and another vehi-
cle that is ahead of your vehicle, or the speed at which your vehicle is
approaching an obstacle is greater than 18 mph (30 km/h).
• The front occupants are wearing a seat belt.
● Pre-collision brake assist:
• Vehicle speed is above 18 mph (30 km/h).
• The relative speed difference between your vehicle and another vehi-
cle that is ahead of your vehicle, or the speed at which your vehicle is
approaching an obstacle is greater than 18 mph (30 km/h).
• The brake pedal is depressed.
● Pre-collision braking:
• The pre-collision braking off button is not pressed.
• Vehicle speed is above 9 mph (15 km/h).
• The relative speed difference between your vehicle and another vehi-
cle that is ahead of your vehicle, or the speed at which your vehicle is
approaching an obstacle is greater than 9 mph (15 km/h).

469
4-3. Do-it-yourself maintenance
4
Maintenance and care
PRIUS_U (OM47668U) U.S.A.
FUSEAmpereCircuit
15 P FR DOOR 25A Power windows
16 D FR DOOR 25A Power windows
17 DOOR RR 25A Power windows
18 DOOR RL 25A Power windows
19 S/ROOF 30A Electric moon roof
20 ECU-IG NO.1 10A Electric cooling fans, multiplex
communication system
21 ECU-IG NO.2 10A Driver support system, Pre-Colli-
sion System, LKA system, inside
rear view mirror, garage door
opener, yaw rate & G sensor,
brake system, electric power
steering, navigation system, elec-
tric moon roof, tire pressure warn-
ing system, seat belt
pretensioners, audio system,
emergency flashers, turn signal
lights, windshield wipers, headlight
cleaner
22 GAUGE 10A Headlight leveling system, front
passenger’s seat belt reminder
light, gauges and meters
23 A/C 10A Air conditioning system, Solar
Ventilation System, Remote Air
Conditioning System
24 WASHER 15A Windshield washer

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

494
5-1. Essential information
PRIUS_U (OM47668U) U.S.A.
Event data recorder
In a crash or a near car crash eventThe SRS airbag sensor assembly contains the EDR. In a crash or a
near car crash event, this device may record some or all of the follow-
ing information:
● Gasoline engine speed
● Whether the brake pedal was applied or not
● Vehicle speed
● To what extent the accelerator pedal was depressed
● Position of the transmission shift lever
● Whether the driver and front passenger wore seat belts or not
● Driver’s seat position
● SRS airbag deployment data
● SRS airbag system diagnostic data
● Front passenger’s occupant classification
The information above is intended to be used for the purpose of
improving vehicle safety performan ce. Unlike general data recorders,
the EDR does not record sound data such as conversation between
passengers.
Your vehicle has computers that monitor and control certain aspects
of your vehicle. These computers assi st in driving and maintaining
optimal vehicle performance.
Besides storing data useful for troubleshooting, there is an event
data recorder (EDR) that records data in a crash or a near car crash
event.