2018 TOYOTA PRIUS horn

1983-4. Adjusting the steering wheel and mirrors
PRIUS_OM_OM47B89U_(U)
Steering wheel
Hold the steering wheel and
push the lever down.
Adjust to the ideal position by
moving the steering wheel hori-
zontally and vertically.
After adjustment, pull the lever up
to secure the steering wheel.
To sound the horn, press on or
close to the mark.
■After adjusting the steering wheel
Make sure that the steering wheel is securely locked.
The horn may not sound if the steering wheel is not securely locked.
Adjustment procedure
1
2
Horn

PRIUS_OM_OM47B89U_(U)
3474-5. Using the driving support systems
4
Driving
WARNING
■Sensors
Certain vehicle conditions and the surrounding environment may affect the
ability of the sensor to correctly detect obstacles. Particular instances where
this may occur are listed below.
● There is dirt, snow or ice on the sensor. (Wiping the sensors will resolve
this problem.)
● The sensor is frozen. (Thawing the area will resolve this problem.)
In especially cold weather, if a sensor is frozen, the screen may show an
abnormal display, or obstacles may not be detected.
● The sensor is covered in any way.
● In harsh sunlight or intense cold weather
● On an extremely bumpy road, on an incline, on gravel, or on grass
● The vicinity of the vehicle is noisy due to vehicle horns, motorcycle
engines, air brakes of large vehicles , or other loud noises producing ultra-
sonic waves.
● The sensor is splashed with water or drenched with heavy rain.
● The sensor is drenched with water on a flooded road.
● The vehicle is leaning considerably to one side.
● The vehicle is equipped with a fender pole or wireless antenna.
● The vehicle is approaching a tall or curved curb.
● The detection range is reduced due to an object such as a sign.
● The area directly under the bumpers is not detected.
● If obstacles draw too close to the sensor.
● The bumper or sensor receives a strong impact.
● A non-genuine Toyota suspension (lowered suspension etc.) is installed.
● There is another vehicle equipped with parking assist sensors in the vicin-
ity.
● Towing eyelets are installed.
● A backlit license plate is installed.
In addition to the examples above, depending on the shape and condition of
obstacles, detection may not be possible, or the detection range may be
shortened.

358
PRIUS_OM_OM47B89U_(U)
4-5. Using the driving support systems
■Situations when the system may opera te even though there is no possi-
bility of a collision
In the following situations, the system may operate even though there is no
possibility of a collision.
● Environmental influence
• The vehicle is driven toward a banner or flag, a low-hanging branch or a
boom barrier (such as those used at railroad crossings, toll gates and
parking lots).
• There is an obstacle on the shoulder of the road (when the vehicle is driven in a narrow tunnel, on a narrow bridge or on a narrow road)
• The vehicle is being parallel parked
• There is a rut or hole in the surface of the road
• When the vehicle is driven on a metal cover (grating), such as those used for drainage ditches
• The vehicle is driven on a steep slope
• The sensor is covered by water on a flooded road
● Influence from the weather
• Ice, snow, dirt, etc., has adhered to the sensor (if removed, the system
returns to normal)
• Heavy rain or water strikes the vehicle
• In severe weather such as fog, snow or a sand storm
● Influence from other sonic waves
• An ultrasonic wave source is nearby, such as the horn or clearance sonar
of another vehicle, a vehicle detector, a motorcycle engine or the air
brake of a large vehicle
• Electronic components (such as a backlit license plate (especially fluo-
rescent types), fog lights, a fender pole or a wireless antenna) are
installed near the sensors
• The vehicle is driven on a narrow
road
• The vehicle is driven on a gravel road or in an area with tall grass

360
PRIUS_OM_OM47B89U_(U)
4-5. Using the driving support systems
●Influence from other sonic waves
• An ultrasonic wave source is nearby, such as the horn or clearance sonar
of another vehicle, a vehicle detector, a motorcycle engine or the air
brake of a large vehicle
• Electronic components (such as a backlit license plate (especially fluo- rescent types), fog lights, a fender pole or a wireless antenna) are
installed near the sensors
● Changes in the vehicle
• The vehicle is tilted a large amount
• The height of the vehicle has drastically changed due to the carried load
(the nose tilts up or down)
• The direction of the sensor has deviated due to a collision or other impact
■ Intelligent Clearance Sonar function while the Simple Advanced Parking
Guidance System is operating
→P. 365
■ When removing and installi ng the 12-volt battery
The system needs to be initialized.
The system can be initialized by driving the vehicle straight ahead for 5 sec-
onds or more at a speed of approximately 22 mph (35 km/h) or higher.
■ When “ICS Unavailable” is displayed on the multi-information display
and the ICS OFF indicator flashes
● Ice, snow, dirt, etc., may have adhered to the sensor. If this occurs, remove
the ice, snow, dirt, etc., from the sensor to return the system to normal.
Also, a warning message may be displayed at low temperatures due to ice
forming on the sensor, and the sensor may not detect obstacles. Once the
ice melts, the system will return to normal.
● If this message is shown even after removing dirt from the sensor, or shown
when the sensor was not dirty to begin with, have the vehicle inspected at
your Toyota dealer.
● System initialization may not have been performed after removal and instal-
lation of the 12-volt battery. Perform system initialization.
■ When “ICS Malfunction Visit Your Deal er” is displayed on the multi-infor-
mation display, the ICS OFF indi cator flashes and the buzzer sounds
The system may not be operating properly. Have the vehicle inspected at
your Toyota dealer.

PRIUS_OM_OM47B89U_(U)
3974-5. Using the driving support systems
4
Driving
WARNING
●Observe the following precautions, as the sensors may stop functioning
properly which may lead to an accident.
• Do not subject the sensor to strong shocks by hitting it, etc. The sen-
sors may not function properly.
• When using a high-pressure washer to wash the vehicle, do not spray
water directly on the sensors. Equipment may not function properly if
subjected to an impact from strong water pressure. If the vehicle
bumper strikes something, equipment may not operate properly due to
a sensor malfunction. Have the vehicle inspected at your Toyota dealer.
● In the following situations, the sensors may not operate normally and may
lead to an accident. Drive carefully.
• Obstacles cannot be detected in the side areas until a scan of the side
areas is completed. ( →P. 345)
• Even after the scan of the side areas is completed, obstacles such as other vehicles, people or animals that approach from the sides cannot
be detected.
• The sensor is frozen (if it thaws, the system returns to normal). A warning message may display at particularly low temperatures due to
the sensor freezing and it may not detect parked vehicles.
• The sensor is blocked by someone’s hand.
• The vehicle is tilted a large amount.
• The temperature is extremely hot or cold.
• The vehicle is driven on undulating r oads, slopes, gravel roads, in areas
with tall grass, etc.
• An ultrasonic wave source is nearby, such as the horn or sensors of another vehicle, a motorcycle engine or the air brake of a large vehicle.
• Heavy rain or a water strikes the vehicle.
• The angle of the sensor may be deviated when assist control starts even if there is a parked vehicle in the target parking spot. Have the
vehicle inspected at your Toyota dealer.
• Do not install any accessories within the sensor detection range.

724
PRIUS_OM_OM47B89U_(U)
8-2. Steps to take in an emergency
If the hybrid system will not start
One of the following may be the cause of the problem:
●The electronic key may not be functioning properly.
* (→ P. 726)
● There may not be sufficient fuel in the vehicle’s tank.
Refuel the vehicle. ( →P. 84)
● There may be a malfunction in the immobilizer system.
* (→ P. 8 9 )
● There may be a malfunction in the shift control system.
*
( → P. 234, 690)
● The hybrid system may be malfunctioning due to an electrical prob-
lem such as electronic key battery depletion or a blown fuse. How-
ever, depending on the type of malfunction, an interim measure is
available to start the hybrid system. (→ P. 725)
● There is a possibility that the temperature of the hybrid battery
(traction battery) is extremely low (approximately below -22°F
[-30°C]). ( →P. 84, 234)
*: It may not be possible to shift the shift position other than P.
One of the following may be the cause of the problem:
● The 12-volt battery may be discharged. ( →P. 729)
● The 12-volt battery terminal con nections may be loose or corroded.
( → P. 6 1 1 )
Reasons for the hybrid system not starting vary depending on
the situation. Check the follo wing and perform the appropriate
procedure:
The hybrid system will not start even though the correct starting
procedure is being followed. ( →P. 231)
The interior lights and headlights are dim, or the horn does not
sound or sounds at a low volume.

7258-2. Steps to take in an emergency
PRIUS_OM_OM47B89U_(U)
8
When trouble arises
One of the following may be the cause of the problem:
●The 12-volt battery may be discharged. ( →P. 729)
● One or both of the 12-volt batter y terminals may be disconnected.
( → P. 6 1 1 )
Contact your Toyota dealer if the problem cannot be repaired, or if repair
procedures are unknown.
When the hybrid system does not start, the following steps can be
used as an interim measure to star t the hybrid system if the power
switch is functioning normally.
Do not use this starting procedure except in cases of emergency.
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 your
Toyota dealer.
The interior lights and headlight s do not turn on, or the horn
does not sound.
Emergency start function
1
2
3

808Alphabetical index
PRIUS_OM_OM47B89U_(U)
Front turn signal lightsReplacing light bulbs............. 656
Turn signal lever ................... 246
Wattage ................................ 754
Fuel
Capacity ................................ 747
Fuel gauge ............................ 108
Gas station information ......... 820
Information ............................ 755
Refueling............................... 268
Type ...................................... 747
Warning light ......................... 675
Fuel filler door.......................... 268 Opener .................................. 270
Refueling............................... 268
When the fuel filler door cannot be opened............... 271
Fuses ........................................ 649
Gas station information .......... 820
Garage door opener ................ 567
Glove box ................................. 542
Hands-free system (for cellular phone)................ 474
Head restraints ........................ 195
Head-up display ....................... 146
Headlights ................................ 248 Automatic High Beam system ......... ....................... 253
Headlight aim ................ 652, 794
Light switch ........................... 248
Replacing light bulbs............. 660
Heaters
Automatic air conditioning system ....... ................. 516, 526
Outside rear view
mirrors ........................ 520, 530
Seat heaters ......................... 536 High coolant
temperature
warning light.......................... 675
High mounted stoplight Replacing.............................. 660
Hill-start assist control ........... 409
Hood ......................................... 601
Hooks Cargo hooks ......................... 547
Coat hooks ........................... 565
Grocery bag hook ................. 548
Retaining hooks (floor mat) .... 26
Horn .......................................... 198
Hybrid battery (traction battery) Location .................................. 82
Specification ......................... 747
Hybrid battery (traction battery)
air intake vent .................. 83, 637
Hybrid system............................ 78 Brake Override System ........ 215
Drive-Start Control ................ 216
Emergency shut off system .......... ..................... ... 83
Energy monitor/consumption
screen ................ 117, 153, 158
EV drive mode ...................... 237
High voltage components ....... 82
Hybrid System Indicator ....... 119
Hybrid system precautions ..... 82
Hybrid vehicle driving tips ..... 415
If the hybrid system will not start .............................. 724
Overheating .......................... 735
Power switch ........................ 231
Regenerative braking ............. 80
Starting the hybrid system .... 231
Vehicle proximity notification system................ 79
Hybrid System Indicator ......... 119
Hybrid transmission................ 240
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