2020 LEXUS RX450H ECU

731-2. Child safety
1
For safety and security
RX350/RX350L_U
WARNING
■When installing a child restraint system
Observe the following precautions.
Failure to do so may result in death or serious injury.
●Firmly attach the top tether strap and make sure that the belt is not twisted.
●Do not attach the top strap to anything other than the anchor bracket of the seat the
child restraint system is installed to.
●Follow all installation instructions provided by the child restraint system manufacturer.
●When installing the child restraint system with the head restraint being raised, after
the head restraint has been raised and then the anchor bracket has been fixed, do not
lower the head restraint.
●When installing a child restraint system in th e rear center seat, adjust both seat cush-
ions to the same position an d align both seatbacks at the same angle. The seatbacks
must be adjusted to the same angle. Othe rwise, the child restraint system cannot be
securely restrained and this may cause death or serious injuries in the event of sudden
braking, sudden swerving or an accident.
●If the seat is adjusted, reconfirm the security of the child restraint system.
NOTICE
■Anchor brackets (for top tether strap)
When not in use, make certain to close the lid. If it remains open, the lid may be dam-
aged.

74
RX350/RX350L_U1-3. Theft deterrent system
The indicator light flashes after the
engine switch has been turned off to
indicate that the system is operating.
The indicator light stops flashing after
the engine switch has been turned to
ACCESSORY or IGNITION ON
mode to indicate that the system has
been canceled.
■System maintenance
The vehicle has a maintenance-free type engine immobilizer system.
■Conditions that may cause the system to malfunction
●If the grip portion of the key is
in contact with a metallic object
●If the key is in close proximity to or touching a key registered to the security system (key
with a built-in transponder chip) of another vehicle
Engine immobilizer system
The vehicle’s keys have built-in transponder chips that prevent the engine
from starting if a key has not been previously registered in the vehicle’s on-
board computer.
Never leave the keys inside the vehicle when you leave the vehicle.
This system is designed to help preven t vehicle theft but does not guarantee
absolute security agai nst all vehicle thefts.

751-3. Theft deterrent system
1
For safety and security
RX350/RX350L_U
■Certification for the engine immobilizer system
For vehicles sold in the U.S.A.

771-3. Theft deterrent system
1
For safety and security
RX350/RX350L_U
The alarm uses light and sound to give an alert when an intrusion is detected.
The alarm is triggered in the following situations when the alarm is set:
●A locked door is unlocked or opened in any way other than using the entry
function, wireless remote control or mech anical key. (The doors will lock again
automatically.)
●The hood is opened.
Close the doors and hood, and lock all
the doors. The system will be set auto-
matically after 30 seconds.
The indicator light changes from being
on to flashing when the system is set.
Do one of the following to de activate or stop the alarms:
●Unlock the doors.
●Turn the engine switch to ACCESSOR Y or IGNITION ON mode, or start
the engine. (The alarm will be deactivat ed or stopped after a few seconds.)
■System maintenance
The vehicle has a maintenance-free type alarm system.
■Items to check before locking the vehicle
To prevent unexpected triggering of the alarm and vehicle theft, make sure of the follow-
ing:
●Nobody is in the vehicle.
●The windows and moon roof or panoramic mo on roof are closed before the alarm is
set.
●No valuables or other personal items are left in the vehicle.
Alarm
The alarm
Setting the alarm system
Deactivating or stopping the alarm

832. Instrument cluster
2
Instrument cluster
RX350/RX350L_ULKA indicator (
P. 291)
(U.S.A.)
Parking brake indicator
( P. 247, 248)
*4
LKA indicator ( P. 291)
(Canada)
Parking brake indicator
( P. 247, 248)
(if equipped)
Intuitive parking assist
indicator ( P. 326)*1Brake hold standby
indicator ( P. 250)
*1, 5
(if equipped)
ICS OFF indicator
( P. 339)*1Brake hold operated
indicator ( P. 250)
(if equipped)
“BSM” indicator ( P. 313)*1Eco Driving Indicator Light
( P. 105)
(if equipped)
“RCTA” indicator
( P. 313)*6
Security indicator
( P. 74, 77)
*2, 3
(if equipped)
BSM outside rear view
mirror indicators
( P. 313)
*1
(AWD
models only)
All-wheel drive lock
indicator ( P. 377)
*1, 4Slip indicator ( P. 380)*7
Low outside temperature
indicator ( P. 86)
*1, 5
VSC OFF indicator
( P. 381)
*1, 6
(U.S.A.)
“AIR BAG ON/OFF”
indicator ( P. 47)
*1, 5PCS warning light
( P. 284)*1, 6
(Canada)
“AIR BAG ON/OFF”
indicator ( P. 47)

124
RX350/RX350L_U3-2. Opening, closing and locking the doors
◆Smart access system with push-button start
Carry the electronic key to enable this function.
Grip the driver’s door handle to
unlock the door. Grip any passen-
ger door handle to unlock all the
doors.
*
Make sure to touch the sensor on the
back of the handle.
The doors cannot be unlocked for
3 seconds after the doors are locked.
*: The door unlock settings can bechanged. ( P. 128, 726)
Touch the lock sensor (indentation on the surface of the door handle) to
lock all the doors.
Check that the door is securely locked.
◆Wireless remote control
Locks all the doors
Check that the door is securely
locked.
Unlocks all the doors
Pressing the button unlocks the
driver’s door. Pressing the button
again within 3 seconds unlocks the
other doors.
Press and hold to open the win-
dows
*2 and the moon roof*1, 2 or
panoramic moon roof
*1, 2
*1: If equipped
*2: This setting must be custom ized at your Lexus dealer.
Side doors
The vehicle can be locked and unlock ed using the entry function, wireless
remote control or door lock switches.
Locking and unlocking the doors from the outside
1
2
1
2

1253-2. Opening, closing and locking the doors
3
Operation of each component
RX350/RX350L_U
■Operation signals
Doors:
A buzzer sounds and the emergency flashers flash to indicate that the doors have been
locked/unlocked. (Locked: Once; Unlocked: Twice)
Windows and moon roof or panoramic moon roof:
A buzzer sounds.
■Security feature
If a door is not opened within approximately 60 seconds after the vehicle is unlocked, the
security feature automatically locks the vehicle again.
■When the door cannot be locked by the lock sensor on the surface of the door handle
■Door lock buzzer
If an attempt to lock the doors is made when a door is not fully closed, a buzzer sounds
continuously for 5 seconds. Fully close the d oor to stop the buzzer, and lock the vehicle
once more.
■Setting the alarm
Locking the doors will set the alarm system. ( P. 77)
■If the smart access system with push-button start or the wireless remote control does
not operate properly
●Use the mechanical key to lock and unlock the doors. ( P. 684)
●Replace the key battery with a new one if it is depleted. ( P. 623)
When the door cannot be locked even if the
lock sensor on the surface of the door handle is
touched by a finger, touch the lock sensor with
the palm.
When gloves are being worn, remove the
gloves.

1303-2. Opening, closing and locking the doors
RX350/RX350L_U
◆Smart access system with push-button start
Carry the electronic key to enable
this function. Locks all the doors
Check that the door is securely
locked.
Unlocks all the doors
The doors cannot be unlocked for 3
seconds after the doors are locked.
◆Wireless remote control
P. 124
◆Door lock switch
P. 126
Press and hold the switch for approxi-
mately 1 second.
The power back door can be operated
whether it is locked
* or unlocked.
Pressing the switch while the power
back door is opening/closing will stop
the operation.
Pressing and holding the switch again
for approximately 1 second will operate
the power back door in the opposite
direction.
*: Opening of the power back door when it is locked can be disabled by a customized setting. ( P. 727)
Power back door
The power back door can be locked/unlocked and opened/closed by the fol-
lowing procedures.
Locking and unlocking the power back door from the outside
1
2
Locking and unlocking the power back door from the inside
Opening/closing the power back d oor using the wireless remote con-
trol