2012 TOYOTA PRIUS brake system warning light

1
2
3
4
5
6
7
3
2-1. Driving proceduresDriving the vehicle............... 180
Power (ignition) switch ........ 192
EV drive mode .................... 199
Hybrid transmission ............ 202
Turn signal lever ................. 211
Parking brake ...................... 212
Horn .................................... 213
2-2. Instrument cluster Gauges and meters ............ 214
Indicators and warning lights ................................. 219
Multi-information display ..... 223
Head-up display .................. 243
2-3. Operating the lights and windshield wipers
Headlight switch .................. 250
Fog light switch ................... 256
Windshield wipers and washer .............................. 258
Rear window wiper and washer .............................. 262
Headlight cleaner switch ..... 265 2-4. Using other driving systems
Cruise control ..................... 266
Dynamic radar cruise control .............................. 270
LKA (Lane-Keeping Assist) .............................. 286
Driving assist systems ........ 296
Hill-start assist control ........ 301
PCS (Pre-Collision System) ............................ 303
2-5. Driving information Cargo and luggage ............. 311
Vehicle load limits............... 316
Winter driving tips ............... 317
Trailer towing ...................... 322
Dinghy towing ..................... 323
2When driving

15
Pictorial indexInstrument panel
Headlight switch
Turn signal lever
Fog light switch

P. 250
P. 211
P. 256
Pre-collision braking off switch P. 304
Parking brake pedal P. 212
Fuel filler door opener
P. 131Tire pressure warning reset switch P. 439
Windshield wipers and
washer switch
Rear window wiper and
washer switch
P. 258
P. 262
Gauges and meters
Multi-information display P. 214
P. 223
Audio system*2 P. 347
Navigation system*1
SRS driver airbag
Horn
P. 140
P. 213
SRS knee airbag P. 140
Tilt and telescopic steering control lever P. 117
: If equipped
*1: Refer to “Navigation System Owner’s Manual”.
*2: Refer to “Display Audio System Owner’s Manual”.

When driving2
179
2-1. Driving proceduresDriving the vehicle............ 180
Power (ignition) switch ..... 192
EV drive mode ................. 199
Hybrid transmission ......... 202
Turn signal lever .............. 211
Parking brake ................... 212
Horn ................................. 213
2-2. Instrument cluster Gauges and meters ......... 214
Indicators and warning lights .............................. 219
Multi-information display............................ 223
Head-up display ............... 243 2-3. Operating the lights and
windshield wipers
Headlight switch ............... 250
Fog light switch ................ 256
Windshield wipers and washer ........................... 258
Rear window wiper and washer ........................... 262
Headlight cleaner switch ............................. 265
2-4. Using other driving systems Cruise control ................... 266
Dynamic radar cruise control ............................ 270
LKA (Lane-Keeping Assist) ............................ 286
Driving assist systems ..... 296
Hill-start assist control ...... 301
PCS (Pre-Collision System).......................... 303
2-5. Driving information Cargo and luggage .......... 311
Vehicle load limits ............ 316
Winter driving tips ............ 317
Trailer towing ................... 322
Dinghy towing .................. 323

189
2-1. Driving procedures
2
When driving
CAUTION
■
When taking a nap in the vehicle
Always turn the hybrid system off. Otherwise, if you accidentally move the
shift lever or depress the accelerator pedal, this could cause an accident or
fire due to hybrid system overheating. Additionally, if the vehicle is parked in
a poorly ventilated area, exhaust gases may collect and enter the vehicle,
leading to death or a serious health hazard.
■ When braking
●When the brakes are wet, drive more cautiously.
Braking distance increases when the brakes are wet, and this may cause
one side of the vehicle to brake differently than the other side. Also, the
parking brake may not securely hold the vehicle.
● If the electronically controlled assist function does not operate, do not fol-
low other vehicles closely and avoid downhill or sharp turns that require
braking.
In this case, braking is still possible, but the brake pedal should be
depressed more firmly than usual. Also, the braking distance will increase.
● The brake system consists of 2 individual hydraulic systems; if one of the
systems fails, the others will still operate. In this case, the brake pedal
should be depressed more firmly than usual and the braking distance will
increase. If this happens, do not continue to drive the vehicle. If the brake
system warning light (red indicator) comes on while driving, immediately
stop the vehicle in a safe place and contact your Toyota dealer.

298 2-4. Using other driving systems
■Sounds and vibrations caused by the ABS, brake assist, VSC and
TRAC
● A sound may be heard from the engine compartment when the hybrid
system is started, just after the vehicle begins to move, if the brake pedal
is depressed forcefully or repeatedly, or 1-2 minutes after the hybrid sys-
tem is stopped. This sound does not indicate that a malfunction has
occurred in any of these systems.
● Any of the following conditions may occur when the above systems are
operating. None of these indicates that a malfunction has occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard after the vehicle comes to a stop.
• The brake pedal may pulsate slightly after the ABS is activated.
• The brake pedal may move down slightly after the ABS is activated.
■ EPS operation sound
When the steering wheel is operated, a motor sound (whirring sound) may
be heard. This does not indicate a malfunction.
■ Reduced effectiveness of the EPS system
The effectiveness of the EPS system 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 EPS system should return to normal within 10 minutes.
■ Electric power steering system warning light (warning buzzer)
P. 501

303
2-4. Using other driving systems
2
When driving
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 t hat 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. 1 11 )
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.
■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.

463
4-3. Do-it-yourself maintenance
4
Maintenance and care
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 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 10A Headlight leveling system, gauges
and meters, emergency flashers,
turn signal lights
23 A/C 10A Air conditioning system, Solar
Ventilation System, Remote Air
Conditioning System
24 WASHER 15A Windshield washer

492
5-1. Essential information
If you think something is wrong
If you notice any of the following symptoms, your vehicle probably
needs adjustment or repair. Contact your Toyota dealer as soon as
possible.
■Visible symptoms
●Fluid leaks under the vehicle
(Water dripping from the air cond itioning after use is normal.)
● Flat-looking tires or uneven tire wear
● High engine coolant temperatur e warning light flashes or
comes on
■ Audible symptoms
●Changes in exhaust sound
● Excessive tire squeal when cornering
● Strange noises related to the suspension system
● Pinging or other noises related to the hybrid system
■ Operational symptoms
●Engine missing, stumbling or running roughly
● Appreciable loss of power
● Vehicle pulls heavily to one side when braking
● Vehicle pulls heavily to one side when driving on a level road
● Loss of brake effectiveness, s pongy feeling, pedal almost
touches the floor