2015 TOYOTA PRIUS brake sensor

288 2-4. Using other driving systems
PRIUS_OM_OM47A17U_DVD_(U)
CAUTION
■When the sensor may not be correctly detecting the vehicle ahead
Apply the brakes (or accelerator pedal) as necessary when any of the follow-
ing 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. 280) 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
● Vehicles splashing up water or snow
■ Conditions under which the vehicle -to-vehicle distance control may
not function correctly
Apply the brakes (or accelerator pedal) as necessary in the following condi-
tions as the radar sensor may not be able to correctly detect vehicles a\
head,
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

308
2-4. Using other driving systems
PRIUS_OM_OM47A17U_DVD_(U)
PCS (Pre-Collision System)
: If equipped
When the radar sensor detects possibility of a frontal collision, the
pre-collision systems such as the brakes and seat belts are automat-
ically engaged to lessen impact as well as vehicle damage.
■ Pre-collision seat belts (front seat belts only)
If the pre-collision sensor detects that a collision is unavoidable, the
pre-collision system will retract the seat belt before the collision occurs.
The same will happen if the driver makes an emergency braking or
loses control of the vehicle. ( P. 112)
However, when the VSC system is disabled, the system will not oper-
ate in the event of skidding.
■ 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. The system may not warn the driver using a warning light,
warning display and buzzer when the system detects and judges brak-
ing operations.
■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 sys-
tem determines that a collision is unavoidable, the brakes are automat-
ically applied to reduce the collision speed. Pre-collision braking can be
disabled using the pre-collision braking off switch.

316 2-4. Using other driving systems
PRIUS_OM_OM47A17U_DVD_(U)
CAUTION
■When the sensor may not be correctly detecting the vehicle ahead
Apply the brakes as necessary in any of the following situations.
●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.)
● Vehicles that cut in suddenly
● Vehicles with small rear ends (trailers with no load on board etc.)
● Motorcycles traveling in the same lane
■ Handling the radar sensor
Observe the following to ensure the pre-collision system can function effec-
tively:
●Keep the sensor and grille cover clean at all times.
Clean the sensor and 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 become
inaccurate or malfunction. If the sensor or surrounding area is subject to a
strong impact, always have the area inspected and adjusted by your
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.

474 4-3. Do-it-yourself maintenance
PRIUS_OM_OM47A17U_DVD_(U)
FUSEAmpereCircuit
14 STOP 10A Stop lights, high mounted stop-
light, brake system, driver support
system, vehicle proximity notifica-
tion system
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 Moon roof
20 ECU-IG NO.1 10A Electric cooling fans, multiplex
communication system, vehicle
proximity notification 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, moon
roof, tire pressure warning system,
seat belt pretensioners, audio sys-
tem, emergency flashers, turn sig-
nal lights, windshield wipers,
headlight cleaner
22 GAUGE 10AHeadlight leveling system, gauges
and meters, emergency flashers,
turn signal lights
23 A/C 10AAir conditioning system, Solar
Ventilation System, Remote Air
Conditioning System

475
4-3. Do-it-yourself maintenance
PRIUS_OM_OM47A17U_DVD_(U)
4
Maintenance and care
FUSEAmpereCircuit
24 WASHER 15A Windshield washer
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, front passenger occupant
classification system (ECU and
sensors), power management sys-
tem, smart key system, front pas-
senger’s seat belt reminder light
29 PANEL 10AAir conditioning system, personal
light, transmission, P position
switch, navigation system, Solar
Ventilation System, Remote Air
Conditioning System, advanced
parking guidance system, head-
light cleaner, front passenger’s
seat belt reminder light, headlight
leveling system, glove box light,
clock, audio system, MPH or km/h
switch
30 TAIL 10AHeadlight leveling system, park-
ing lights, tail lights, license plate
lights, front fog lights, side marker
lights

524 5-2. Steps to take in an emergency
PRIUS_OM_OM47A17U_DVD_(U)
Warning messageDetailsCorrection procedure
(Flashes
rapidly)
(If equipped) Indicates that there is a high
possibility of a frontal collision,
or that the pre-collision braking
function is operating.
A buzzer also sounds.
At the same time,
will appear on the
head-up display (the image
flashes). Slow the vehicle by
applying the
brakes.
(If equipped, flashes) Indicates that your vehicle is
nearing the vehicle ahead (in
radar cruise mode).
A buzzer also sounds.
At the same time,
will appear on the
head-up display (the image
flashes). Slow the vehicle by
applying the
brakes.
(If equipped) Indicates that the LKA (Lane-
Keeping Assist) is suspended
• The camera sensor tempera-
ture is higher than the opera-
tion temperature range.
• The power steering system operation is restricted. Restart the LKA
after driving for a
while.