brake sensor Lexus GS300h 2015 User Guide

3254-5. Using the driving support systems
4
Driving
GS450h_300h_OM_OM30F00E_(EE)
■When the sensor may not be correctly detecting the vehicle ahead
In the case of the following and depending on the conditions, operate the brake pedal
when deceleration of the system is insufficient or operate the accelerator pedal when
acceleration is required.
As the sensor may not be able to correctly detect these types of vehicles, the approach
warning (→P. 322) may not be activated.
●Vehicles that cut in suddenly
●Vehicles traveling at low speeds
●Vehicles that are not moving in the same lane
●Vehicles with small rear ends (traile rs with no load on board, etc.)
●Motorcycles traveling in the same lane
●When water or snow thrown up by the surrounding vehicles hinders the detecting of
the sensor
●When your vehicle is pointing upwards
(caused by a heavy load in the luggage com-
partment, etc.)
●Preceding vehicle has an extremely high
ground clearance

3264-5. Using the driving support systems
GS450h_300h_OM_OM30F00E_(EE)
■Conditions under which the vehicle-to-vehicle distance control mode may not function
correctly
In the case of the following conditions, operate the brake pedal (or accelerator pedal,
depending on the situation) as necessary.
As the sensor may not be able to correctly detect vehicles ahead, the system may not
operate properly.
●When the vehicle ahead of you decelerates suddenly
●When the road curves or when the lanes are
narrow
●When steering wheel operation or your posi-
tion in the lane is unstable

4777-2. Steps to take in an emergency
7
When trouble arises
GS450h_300h_OM_OM30F00E_(EE)
ABS warning lightIndicates a malfunction in:
•The ABS; or
• The brake assist system
→ Have the vehicle inspected by any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional
immediately.
Electric power steering system warning light (warning buzzer)
Indicates a malfunction in the EPS (Electric Power Steering) sys-
tem
→ Have the vehicle inspected by any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional
immediately.
(Flashes)
(If equipped)
PCS (Pre-Crash Safety system) warning light
●When the warning light flashes (and a buzzer sounds):
Indicates a malfunction in the PCS (Pre-Crash Safety system)
→ Have the vehicle inspected by any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional
immediately.
●When the warning light flashes (and a buzzer does not sound):
Indicates that the PCS (Pre-Crash Safety system) is temporarily
unavailable, possibly due to either of the following:
• An area around the radar sensor or camera sensor being dirty
or covered with condensation, ice, stickers, etc.
→ Clear the dirt, condensation, ice, stickers, etc.
(→ P. 263, 284, 292)
• Radar sensor or camera sensor being outside of its operational
condition range. (temperature etc.)
→ If operational condition (tempera ture etc.) is satisfied, PCS
(Pre-Crash Safety system) becomes to be available.
●When the warning light is illuminated:
Either the VSC (Vehicle Stability Control) system or PCS (Pre-
Crash Safety system) is disabled or both are disabled.
→ To enable the PCS (Pre-Crash Safety system), enable both
the VSC system and PCS (Pre-Crash Safety system).
(→ P. 2 8 0 , 3 4 7 )
Slip indicator
Indicates a malfunction in:
• The VSC system;
• The TRC system; or
• The hill-start assist control system
→ Have the vehicle inspected by any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional
immediately.
The light will flash when the VSC, TRC or ABS system is operating.
Warning lightWarning light/Details/Actions

4857-2. Steps to take in an emergency
7
When trouble arises
GS450h_300h_OM_OM30F00E_(EE)
(If equipped)
Indicates a malfunction in the Lexus parking assistAll assist-sensors flash.
A buzzer also sounds.
→ Have the vehicle inspected by any authorized Lexus
dealer or repairer, or another duly qualified and
equipped professional.
(If equipped)
Indicates that Lexus parking assist-sensor is dirty or cov-
ered with ice
A buzzer also sounds.
→ Clean the sensor.
Indicates an attempt was made to release the parking
brake with a door open or the front passenger’s seat belt
unfastened
A buzzer also sounds.
→ Close all doors and fasten the front passenger’s seat
belt before releasing the parking brake.
Wa r n i n g m e s s a g eDetails/Actions
(Flashes)

4937-2. Steps to take in an emergency
7
When trouble arises
GS450h_300h_OM_OM30F00E_(EE)
(If equipped)
Indicates that the radar sensor is dirty or covered with
iceA buzzer also sounds.
→ Clean the sensor.
(If equipped)
Indicates that the dynamic radar cruise control system
cannot be used temporarily due to bad weather
A buzzer also sounds.
→ Use the radar cruise control system when it
becomes available again.
(If equipped)
Indicates that the radar cruise control system brake con-
trol function is temporarily unavailable
→Depress the brake.
(If equipped)
Indicates that the grille shu tter system cannot operate or
the grille shutter is dirty or covered with ice
A buzzer also sounds.
→ Have the vehicle inspected by any authorized Lexus
dealer or repairer, or another duly qualified and
equipped professional.
Wa r n i n g m e s s a g eDetails/Actions

4947-2. Steps to take in an emergency
GS450h_300h_OM_OM30F00E_(EE)
(Vehicles with entry function)
Indicates a malfunction in the smart entry & start systemA buzzer also sounds.
→ Have the vehicle inspected by any authorized Lexus
dealer or repairer, or another duly qualified and
equipped professional.
(If equipped)
Indicates that a Blind Spot Monitor sensor or the sur-
rounding area on the bumper is dirty or covered with ice
A buzzer also sounds.
→ Clean the sensor and its surrounding area on the
bumper.
Indicates a malfunction in the cruise control system or
dynamic radar cruise control system (if equipped)
Press the “ON/OFF” button once to deactivate the
system, and then press the button again to reactivate
the system.
A buzzer also sounds.
→ Have the vehicle inspected by any authorized Lexus
dealer or repairer, or another duly qualified and
equipped professional.
(If equipped)
Indicates a malfunction in the dynamic radar cruise con-
trol with full-speed range
Depress the brake pedal.
A buzzer also sounds.
→ Have the vehicle inspected by any authorized Lexus
dealer or repairer, or another duly qualified and
equipped professional.
Wa r n i n g m e s s a g eDetails/Actions
(Flashes)

5267-2. Steps to take in an emergency
GS450h_300h_OM_OM30F00E_(EE)
WA R N I N G
■When using the compact spare tire
●Remember that the compact spare tire provided is specifically designed for use with
your vehicle. Do not use your compact spare tire on another vehicle.
●Do not use more than one compact spare tire simultaneously.
●Replace the compact spare tire with a standard tire as soon as possible.
●Avoid sudden acceleration, abrupt steeri ng, sudden braking and shifting operations
that cause sudden engine braking.
■When the compact spare tire is attached
The vehicle speed may not be correctly detected, and the following systems may not
operate correctly:
■Speed limit when using the compact spare tire
Do not drive at speeds in excess of 80 km/h (50 mph) when a compact spare tire is
installed on the vehicle.
The compact spare tire is not designed for driving at high speeds. Failure to observe
this precaution may lead to an accid ent causing death or serious injury.
■After using the tools and jack
Before driving, make sure all the tools and jack are securely in place in their storage
location to reduce the possibility of personal injury during a collision or sudden brak-
ing.
• ABS & Brake assist
•VSC
•TRC
• Cruise control (if equipped)
• Dynamic radar cruise control (if equipped)
• Dynamic radar cruise control with full-
speed range (if equipped)
• (Pre-Crash Safety system) (if equipped)
•EPS
•AFS (if equipped)
• LDH (if equipped)
• DRS (if equipped)
• Adaptive Variable Suspension system (if equipped) • LDA (Lane Departure Alert with
steering control) (if equipped)
• LKA (Lane-Keeping Assist) (if equipped)
• Tire pressure warning system (if equipped)
•VDIM
• VGRS (if equipped)
• Lexus parking assist monitor (if equipped)
• Lexus parking assist-sensor (if equipped)
• Navigation system (if equipped)

600What to do if... (Troubleshooting)
GS450h_300h_OM_OM30F00E_(EE)
●Is the window lock switch pressed?
The power window except for the one at the driver’s seat cannot be operated
if the window lock switch is pressed. ( →P. 1 9 3 )
●The auto power off function will be operated if the vehicle is left in ACCES-
SORY or ON mode (the hybrid system is not operating) for a period of time.
(→ P. 2 1 9 )
●The seat belt reminder light is flashing
Are the driver and the front passenger wearing the seat belts? ( →P. 4 7 8 )
●The parking brake indicator is on
Is the parking brake released? ( →P. 2 3 1 )
Depending on the situation, other types of warning buzzer may also sound.
( → P. 4 76 , 4 8 2 )
●Did anyone inside the vehicle open a door or anything move inside the vehicle
during setting the alarm?
The sensor detects them and the alarm sounds. ( →P. 9 0 )
To stop the alarm, turn the power switch to ON mode or start the hybrid system.
●Is the electronic key left inside the vehicle or the moon roof opened (if
equipped)?
Check the message on the multi-information display. ( →P. 4 8 2 )
The windows do not open or close by operating the power window
switches
The power switch is turned off automatically
A warning buzzer sounds during driving
An alarm is activated and th
e horn sounds (if equipped)
A warning buzzer sounds when leaving the vehicle
(vehicles with entry function)

612Alphabetical index
GS450h_300h_OM_OM30F00E_(EE)
Multi-information display ...................... 111Audio system-linked ............................. 111
Drive information .................................. 113
Dynamic radar cruise control ...... 315
Dynamic radar cruise control with full-speed range....................303
G-force...................................................... 114
LDA (Lane Departure Alert with steering control) ...................290
LKA (Lane-Keeping Assist) .......... 281
Navigation system-linked................... 111
Settings....................................................... 115
Switch settings........................................ 115
Switching the display ...........................112
nanoe  system ..................................... 376
Navigation system
*
Odometer................................................. 105
Oil Differential oil ....................................... 574
Engine oil ...............................................570
Opener
Fuel filler door......................................256
Hood .......................................................... 417
Trunk ..........................................................146
Outer foot lights
Location................................................. 386
Replacing light bulbs..........................461
Wattage..................................................578 Outside rear view mirrors ................. 190
Adjusting and folding ........................190
BSM (Blind Spot Monitor) ........... 333
Linked mirror function
when reversing ...................................191
Mirror position memory .................. 178
Outside rear view mirror defoggers .......................................... 372
Outside temperature display ........... 105
Overheating ........................................... 556
Paddle shift switches ........................... 226
Parking assist sensors
*
Parking brake...........................................231 If the parking brake cannot
be released ....................................... 546
Operation ............................................... 231
Parking brake engaged warning buzzer............................... 482
Parking brake engaged warning message .......................... 482
PCS (Pre-Crash Safety system)............ 269
Function.................................................. 269
Warning light........................................ 477
Warning message ............................ 482
Personal lights........................................ 387
Pollen removal mode.......................... 372
Power control unit ...................................79
N
O
P

616Alphabetical index
GS450h_300h_OM_OM30F00E_(EE)
SwitchesAdaptive High-beam System
switch....................................................240
Audio remote control switches
*
Automatic High Beam switch ..... 245
Brake hold switch .............................. 234
Cruise control switch............................. 303, 315, 327
Door lock switches ............................. 142
Driving mode select switch ..........330
Driving position memory switches.................................................178
Emergency flashers switch .......... 468
EV drive mode switch..................... 222
Fog light switch ................................... 249
Heated steering wheel switch.....382
HUD (Head-up display) switches.................................................. 119
Ignition switch ........................................ 217
Lexus parking assist-sensor switch
*
Light switch ........................................... 236
LDA (Lane Departure Alert with steering control) switch .... 293
LKA (Lane-Keeping Assist) switch....................................................285
Meter control switches. ......................112
Moon roof switches .......................... 196
Outside rear view mirror switches................................................ 190
Paddle shift switches ........................ 226
Parking brake switches.....................231
Power door lock switch ................... 142
Power switch ......................................... 217
Power window switches ..................193
Rear sunshade switch..................... 400 Rear window and outside rear
view mirror defoggers
switch ....................................................372
Seat heater switches ........................ 382
Seat ventilator switches .................. 382
Snow mode switch ............................225
Talk switch
*
Telephone switches*
Tilt and telescopic steering control switch ....................................186
Trunk closer switch ............................ 147
Trunk opener switch.......................... 146
Trunk opener main switch .............. 148
Vehicle-to-vehicle distance button .....................309, 321
VSC OFF switch............................... 346
Window lock switch .......................... 193
Windshield wipers
and washer switch......................... 250
Tachometer ............................................. 104
Tail lights................................................... 236 Light switch........................................... 236
Replacing light bulbs ....................... 465
Welcome light illumination
control ...................................................140
Talk switch
*
Telephone switches*
Theft deterrent system
Alarm .......................................................... 90
Double locking system ...................... 89
Immobilizer system ............................. 84
Intrusion sensor and tilt sensor...... 93
T