2018 LEXUS RX450h sensor

582 7-1. Maintenance and care
RX450h_RX450hL _U_OM48F85UWARNING ■
When washing the vehicle
Do not apply water to the inside of the engine compartment. Doing so may cause the
electrical components, etc. to catch fire. ■
When cleaning the windshield
●
When the upper part of the windshield where the raindrop se nsor is located is
touched by hand ●
When a wet rag or similar is held close to the raindrop sensor ●
If something bumps against the windshield ●
If you directly touch the raindrop sensor bo dy or if something bumps into the raindrop
sensor ■
Precautions regarding the exhaust pipe
Exhaust gasses cause the exhaust pipe to become quite hot.
When washing the vehicle, be careful not to touch the pipe until it has cooled suffi-
ciently, as touching a hot exhaust pipe can cause burns. ■
Precautions regarding the rear bumper with Blind Spot Monitor
If the paint of the rear bumper is chipped or scratched, the syst em may malfunction. If
this occurs, consult your Lexus dealer.Set the wiper switch to off.
If the switch is in “AUT O”, the wipers may oper-
ate unexpectedly in the following situations,
and may result in hands being caught or other
serious injuries and cause damage to the wiper
blades.
Off

662 8-2. Steps to take in an emergency
RX450h_RX450hL _U_OM48F85U (Flashes or illuminates)
PCS warning light
Indicates a malfunction in the PCS (Pre-Collision System) or that
the system is temporarily unavailable due to the vehicle being
extremely hot/cold, or dirt around a front sensor, etc.
( → P. 296, 671)
→ Follow the instructions displaye d on the multi-information dis-
play. ( → P. 296, 671)
If the PCS (Pre-Collision System ) or VSC (Vehicle Stability Con-
trol) system is disabled, the PC S warning light will illuminate.
→ P. 296 (Flashes)
ICS OFF indicator
When a buzzer sounds:
Indicates a malfunction in the Intelligent Clearance Sonar system
→ Have the vehicle inspected by your Lexus dealer immediately.
When a buzzer does not sound:
Indicates that the system is temporarily unavailable, possibly due to
a sensor being dirty or covered with ice, etc.
→ Clear the dirt, etc.
Low fuel level warning light
Indicates that remaining fuel is approximately 2.9 gal. (11.0 L,
2.4 Imp. gal.) or less
→ Refuel the vehicle.
Driver’s and front passenger’s seat belt reminder light (warning
buzzer)
* 1
Warns the driver and/or front passenger to fasten their seat belts
→ Fasten the seat belt.
If the front passenger’s seat is occupied, the front passenger’s
seat belt also needs to be fastened to make the warning light
(warning buzzer) turn off. (RX450h)
(RX450hL)
Rear passengers’ seat belt reminder light (warning buzzer)
* 2
Warns the rear passengers to fasten their seat belts
→ Fasten the seat belt.
Tire pressure warning light
Indicates the following:
• Low tire pressure due to flat tire;
• Low tire pressure due to natural causes; or
• The tire pressure warnin g system is malfunctioning
→ Immediately stop the vehicle in a safe place.
Handling method ( → P. 664)Warning light Warning light/Details/Actions

664 8-2. Steps to take in an emergency
RX450h_RX450hL _U_OM48F85U■
SRS warning light
This warning light system monitors the airbag sensor assembly, front impact sensors, side
impact sensors (front door), side impact se nsors (rear), driver’s seat position sensor,
driver’s seat belt buckle sw itch, front passenger occupant classification system (ECU and
sensors), “AIR BAG ON” indicator light, “A IR BAG OFF” indicator light, front passen-
ger’s seat belt buckle switch, driver’s seat belt pretension er, front passenger’s seat belt
pretensioner and force limiter, airbags, in terconnecting wiring and power sources.
( → P. 36) ■
Front passenger detection sensor, seat belt reminder and warning buzzer●
If luggage is placed on the front passenger seat, the front passenger detection sensor
may cause the warning light to flash and the warning buzzer to sound even if a passen-
ger is not sittin g in the seat.●
If a cushion is placed on the seat, the sens or may not detect a passenger, and the warn-
ing light may not operate properly. ■
Electric power steering system warning light (warning buzzer)
When the 12-volt battery charge becomes insu fficient or the voltage temporarily drops,
the electric power steering system warning light may come on and the warning buzzer
may sound. ■
If the malfunction indicator lamp comes on while driving
First check the following: ●
Is the fuel tank empty?
If it is, fill the fu el tank immediately.●
Is the fuel tank cap loose?
If it is, tighten it securely.
The light will go off after several driving trips.
If the light does not go off even after severa l trips, contact your Lexus dealer as soon as
possible. ■
When the tire pressure warning light comes on
Inspect the tires to check if a tire is punctured.
If a tire is punctured: → P. 673
If none of the tires are punctured:
Turn the power switch off then turn it to ON mode. Check if the tire pressure warning
light comes on or blinks. 
If the tire pressure warning light comes on
After the temperature of the tires has lowere d sufficiently, check the inflation pressure
of each tire and adjust th em to the specified level.
If the warning light does not turn off even after several minutes have elapsed, check
that the inflation pressure of each tire is at the specified level an d perform initialization.
( → P. 613)
If the warning light does not turn off severa l minutes after the init ialization has been per-
formed, have the vehicle inspected by your Lexus dealer immediately. 
If the tire pressure wa rning light blinks for 1 minute then stays on
There may be a malfunction in the tire pressure warnin g system. Have the vehicle
inspected by your Lexus dealer immediately. 1
2

7399-2. Customization
9
Vehicle specifications
RX450h_RX450hL _U_OM48F85U■
Power back door ( → P. 142)
* : If equipped Function Default setting Customized setting
Power back door switch opera-
tion Press for 1 second One short press — O
Automatic closing of the back
door when lowered On Off — O
Automatic opening of the back
door using the back door opener
switch On Off — O
Power back door opening posi-
tion 5 1 to 5 O O
Buzzer volume Level 3 Level 1
— O
Level 2
Power back door/touchless sen-
sor
* On Power back door:
On
Touchless sensor:
Off — O
Off
Power back door open/close
buzzer When the back
door begins to
operate: On
While the back
door is operating:
Off Off
— OWhen the back
door begins to
operate: Off
While the back
door is operating:
On
On
Touchless sensor
* sensitivity Level 2 (standard) Level 1 (lowest) to
level 3 (highest) — O 1 2

744 9-2. Customization
RX450h_RX450hL _U_OM48F85U■
Turn signal lever ( → P. 252)
■
Automatic light control system ( → P. 258)
■
Lights ( →
P. 258)
* 1
:Except for Canada
* 2
: If equipped
■
Rain-sensing windshield wipers ( →
P. 267)Function Default setting Customized setting
The number of times the turn sig-
nal lights flash automatically
when the turn signal lever is
moved to the first position during
a lane change 3 5
— O7
Off 1 2
Function Default setting Customized setting
Light sensor sensitivity Standard -2 to 2 O O
Time elapsed before headlights
automatically turn off after doors
are closed 30 seconds Off
OO
60 seconds
90 seconds 1 2
Function Default setting Customized setting
Daytime running lights On Off
* 1
O O
Welcome lighting On Off — O
AFS (Adaptive Front-lighting
System)
* 2
On Off — O
Windshield wiper linked head-
light illumination On Off — O 1 2
Function Default setting Customized setting
Wiper operation when the wiper
switch is in the “AUTO” position Rain-sensing oper-
ation Intermittent opera-
tion linked to vehi-
cle speed (with
interval adjuster) — O 1 2

7459-2. Customization
9
Vehicle specifications
RX450h_RX450hL _U_OM48F85U■
Intuitive parking assist ( → P. 332)
* : When intuitive parking assist is operating. ■
BSM (Blind Spot Monitor) ( → P. 319)Function Default setting Customized setting
Detection distance of the front
center sensor Far Near O O
Detection distance of the rear
center sensor Far Near O O
Buzzer volume 3 1 to 5 O O
Display setting
* All sensors dis-
played Display off O O 1 2
Function Default setting Customized setting
Outside rear view mirror indica-
tor brightness Bright Dim O O
Alert timing for presence of
approaching vehicle (BSM func-
tion only) Intermediate Early
O OLate
Only when in blind
spot
RCTA buzzer volume Level 2 Level 1
O —
Level 3 1 2

746 9-2. Customization
RX450h_RX450hL _U_OM48F85U■
Driving mode select switch ( → P. 379)
* : If equipped ■
Front automatic air conditioning system ( → P. 507)
■
Seat heaters/seat ventilators ( → P. 526, 527)Function Default setting Customized setting
Powertrain control in customized
mode
* Normal Power
O —
Eco
Chassis control in customized
mode
* Normal Sport O —
Air conditioning operation in
customized mode
* Normal Eco O — 1 2
Function Default setting Customized setting
A/C auto switch operation On Off O O
Exhaust gas sensor sensitivity Standard -3 to 3 O O 1 2
Function Default setting Customized setting
Driver’s seat temperature prefer-
ence in automatic mode Standard -2 (cooler) to 2
(warmer) O O
Front passenger’s seat tempera-
ture preference in automatic
mode Standard -2 (cooler) to 2
(warmer) O O 1 2

768 What to do if... (Troubleshooting)
RX450h_RX450hL _U_OM48F85U●
The seat belt reminder light is flashing
Are the driver and the passengers wearing the seat belts?
( → P. 662, 662)●
The parking brake indicator is on
Is the parking brake released? ( → P. 253)
Depending on the situation, other type s of warning buzzer may also sound.
( → P. 660, 667) ●
Did anyone inside the vehicle open a door during setting the alarm?
The sensor detects it and the alarm sounds. ( → P. 86)
Do one of the following to stop the alarms: • Unlock the doors.
• Turn the power switch to ACCESSORY or ON mode, or start the hybrid system.
●
Is the message displayed on the multi-information display?
Check the message on the multi-information display. ( → P. 667)
●
When a warning light turns on or a wa rning message is displayed, refer to
P. 660, 667. A warning buzzer sounds during driving
An alarm is activated and the horn sounds
A warning buzzer sounds when leaving the vehicle
A warning light turns on or a warning message is displayed