ECU LEXUS RX450h 2021 Repair Manual

2534-5. Using the driving support systems
4
Driving
ations:
• When the sensor is misaligned due to a strong impact to the sensor or its sur-
rounding area
• When the distance between your vehicle and a guardrail, wall, etc. that enters the
detection area is short
• When driving up an d down consecutive
steep inclines, such as hills, dips in the
road, etc.
• When vehicle lanes are narrow, or when driving on the edge of a lane, and a vehi-
cle traveling in a lane other than the adja-
cent lanes enters the detection area
• When driving on roads with sharp bends,
consecutive curves, or uneven surfaces
• When the tires are slipping or spinning
• When the distance between your vehicle and a following vehicle is short
• When an accessory (such as a bicycle carrier) is installed to the rear of the vehi-
cle
*: If equipped
■Intuitive parking assist (if
equipped)
Ultrasonic sensors are used to detect
static objects in the detection area
when driving at a low speed or backing
up. ( P.255)
■RCTA (Rear Cross Traffic Alert)
function (if equipped)
Rear side radar sensors are used to
detect approaching vehicles in the
detection areas behind the vehicle
when backing up. ( P.261)
■Adjusting the buzzer volume
The buzzer volume can be adjusted on
the multi-information display. The vol-
ume of buzzers for the intuitive parking
assist and RCTA function will be
PKSA (Parking Support
Alert)*
The Parking Support Alert system
consists of the following functions
that operate when driving at a low
speed or backing up, such as when
parking. When the system deter-
mines that the possibility of a colli-
sion with a detected object or such
as a wall is high, a warning operates
to urge the driver to take evasive
action.
PKSA (Parking Support Alert)
system
Setting the buzzer volume

3295-5. Using the storage features
5
Interior features
Type A
Press in the lid.
Type B (if equipped)
Pull up the lever to release the lock,
and lift the lid. Pull down the hook to use.
The cargo hooks are provided for securing
loose items.
RX450h
RX450hL
To hang the cargo net, use the cargo
net hooks and rear cargo hooks.
WARNING
■Caution while driving
Keep the coin box closed while driving.
Injuries may result in the event of an acci-
dent or sudden braking.
Auxiliary boxes
WARNING
■Items unsuitable for storing (Type A)
Do not store items he avier than 0.44 lb.
(200 g).
Doing so may cause the auxiliary box to
open and the items inside may fall out,
resulting in an accident.
Luggage compartment fea-
tures
Cargo hooks
WARNING
■When cargo hooks are not in use
To avoid injury, always return the hooks
to their stowed positions when not in use.
Cargo net hooks

3465-6. Using the other interior features
The HomeLink® wireless control sys-
tem in your vehicle has 3 buttons which
can be programmed to operate 3 dif-
ferent devices. Refer to the program-
ming methods on the following pages
to determine the method which is
appropriate for the device.
HomeLink
® indicator light
Garage door operation indicators
HomeLink
® icon
Illuminates while HomeLink® is operating.
Buttons
■Codes stored in the HomeLink® mem-
ory
●The registered codes are not erased even
if the 12-volt battery cable is discon-
nected.
NOTICE
■To ensure normal operation of the
sunshade
●Do not put anything in an area where it
may interfere with the operation of a
rear door sunshade.
●To prevent damage to the rear door
sunshades, do no t apply excessive
load or attach items to the rear door
sunshades.
Garage door opener
The garage door opener can be
programmed using the Home-
Link
® to operate garage doors,
gates, entry doors, door locks,
home lighting systems, security sys-
tems, and other devices.
System components
A
B
C
D

3545-6. Using the other interior features
3Drive the vehicle at 5 mph (8
km/h) or less in a circle until a
direction is displayed.
If there is not enough space to drive in a
circle, drive around the block until a direc-
tion is displayed.
WARNING
■When doing the circling calibration
Secure a wide space, and watch out for
people and vehicles in the vicinity. Do not
violate any local traffic rules while per-
forming circling calibration.

3646-2. Maintenance
Radiator/con-
denser
The radiator and con-
denser should be free
from foreign objects.
( P.374)
Washer fluid
Is there sufficient
washer fluid?
( P.375)
Luggage compartment
ItemsCheck points
12-volt batteryCheck the connec-
tions. ( P.376)
Vehicle interior
ItemsCheck points
Accelerator
pedal
• The accelerator
pedal should move
smoothly (without
uneven pedal effort
or catching).
Hybrid transmis-
sion “Park” mech-
anism
•When parked on a slope and the shift
lever is in P, is the
vehicle securely
stopped?
Brake pedal
• Does the brake pedal move
smoothly?
• Does the brake pedal have appro-
priate clearance
from the floor?
• Does the brake pedal have the cor-
rect amount of free
play?
ItemsCheck points
Brakes
• The vehicle should not pull to one side
when the brakes are
applied.
•The brakes should work effectively.
• The brake pedal should not feel
spongy.
• The brake pedal should not get too
close to the floor
when the brakes are
applied.
Head restraints
•Do the head restraints move
smoothly and lock
securely?
Indicators/buzz-
ers•Do the indicators and buzzers function
properly?
Lights
• Do all the lights come on?
• Are the headlights aimed correctly?
( P.397)
Parking brake
• Does the parking
brake switch oper-
ate normally?
• When parked on a slope and the park-
ing brake is on, is the
vehicle securely
stopped?
Seat belts
• Do the seat belts operate smoothly?
• The seat belts should not be damaged.
ItemsCheck points

3926-3. Do-it-yourself maintenance
1Change the rest position of the
windshield wipers to the service
position using the wiper lever and
then lift a windshield wiper.
(P.209)
2 While pressing and holding the
wiper blade lock release button,
remove the wiper blade.
When performing this operation, make
sure to hold the hook portion of the wiper
arm securely.
Hook portion
3 While disengaging the cap lock,
using a tool such as a flathead
screwdriver if necessary, remove
the wiper insert.
Hold the cap on the end of the wiper insert
when removing the wi per insert. (The cap
is integrated into the wiper insert.)
If using a screwdriver, make sure to wrap its tip with tape to protect the wiper blade.
Cap lock
4 Install a new wiper insert.
Make sure to push the wiper insert firmly
until the cap lock is engaged.
After installation, check that the cap lock is
locked securely.
5Install the wiper blade to the wiper
arm.
Make sure to push the wiper blade until it is
locked.
When performing this operation, make
sure to hold the hook portion of the wiper
arm securely.
After installation, check that the wiper
blade is locked securely.
6 After replacing the wiper inserts,
place the windshield wipers on the
windshield and lower them to the
retracted position. ( P.209)
Do not drive the vehicle with the wind-
shield wipers lifted.
Windshield wiper inserts
Replacing a windshield wiper
insert
A
A

4016-3. Do-it-yourself maintenance
6
Maintenance and care
flathead screwdriver to pry the center por-
tion out and then remove the whole clip.
2 Pull back the fender liner until the
connector is visible. 3
Partially remove the fender liner
and turn the bulb base counter-
clockwise and remove it.
4 Remove the light bulb.
5 Install a new light bulb and then
install the bulb base to the light unit
by inserting it and turning it clock-
wise.
After installing the bulb base, wiggle it
lightly to make sure it is securely installed
and turn the lights on to visually check that
there is no light leaking from between the
bulb base and light unit.

4036-3. Do-it-yourself maintenance
6
Maintenance and care
4Turn the bulb base counterclock-
wise and remove it.
5 Remove the light bulb.
6 Install a new light bulb and then
install the bulb base to the light unit
by inserting it and turning it clock-
wise.
After installing the bulb base, wiggle it
lightly to make sure it is securely installed
and turn the lights on to visually check that
there is no light lea king from between the
bulb base and light unit.
7 For the right side only: Install the
bracket and close the cap.
8 For the right side only: Fix the
washer fluid inlet.
1 Align the tab position and install
washer fluid inlet.
2 Fasten the bolt.
A

4056-3. Do-it-yourself maintenance
6
Maintenance and care
tape to the taillight unit and fold the
excess in half.
2 Hold the folded portion and pull it
toward the rear of the vehicle to
remove the light unit.
5 Turn the bulb base counterclock-
wise and remove it.
6 Remove the light bulb.
7 Install a new light bulb and then
install the bulb base to the light unit
by inserting it and turning it clock-
wise.
After installing the bulb base, wiggle it
lightly to make sure it is securely installed
and turn on the rear turn signal lights to
visually check that ther e is no light leaking from between the bulb
base and light unit.
8Install the light unit.
Align the tabs and push the light unit-
toward the front of the vehicle to install it.
9Install the 2 screws.

4066-3. Do-it-yourself maintenance
10Install the cover.
11 Remove the protective tape.
■Back-up lights (bulb type)
1 Open the back door and remove
the cover.
Using a flathead screwdriver, remove the
cover.
To prevent scratching to the vehicle, wrap
the tip of the flathead screwdriver with a
cloth, etc.
2 Turn the bulb base counterclock-
wise and remove it. 3
Remove the light bulb.
4 Install a new light bulb and then
install the bulb base to the light unit
by inserting it and turning it clock-
wise.
After installing the bulb base, wiggle it
lightly to make sure it is securely installed
and turn on the back-up lights to visually
check that there is no light leaking from
between the bulb ba se and light unit.
5Install the cover.
Align the tabs of the cover with the grooves
and install the cover.