key LEXUS RX450H 2020 Repair Manual

6868-2. Steps to take in an emergency
RX350/RX350L_U
■Stopping the engine
Shift the shift lever to P, set the parking brake, and press the engine switch as you nor-
mally do when stopping the engine.
■Replacing the key battery
As the above procedure is a temporary measure, it is recommended that the electronic
key battery be replaced immediately when the battery is depleted. ( P. 623)
■Changing engine switch modes
Release the brake pedal and press the engine switch in step above.
The engine does not start and modes will be changed each time the switch is pressed.
(  P. 232)
■When the electronic key does not work properly
●Make sure that the smart access system wi th push-button start has not been deacti-
vated in the customization setting. If it is off, turn the function on.
(Customizable features P. 722)
●Check if battery-saving mode is set. If it is set, cancel the function. (P. 148)
WARNING
■When using the mechanical key and operating the power windows or the moon roof
or panoramic moon roof
Operate the power window or the moon roof or panoramic moon roof after checking
to make sure that there is no possibility of any passenger having any of their body parts
caught in the window or the moon roof or panoramic moon roof.
Also, do not allow children to op erate the mechanical key. It is possible for children and
other passengers to get caught in the powe r window or the moon roof or panoramic
moon roof.
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6878-2. Steps to take in an emergency
8
When trouble arises
RX350/RX350L_U
If you have a set of jumper (or booster) cables and a second vehicle with a bat-
tery, you can jump start your vehicle by following the steps below.Confirm that the electronic key is
being carried.
When connecting the jumper (or
booster) cables, depe nding on the situa-
tion, the alarm may activate and doors
locked. (
P. 78)
Open the hood ( P. 592)
If the vehicle battery is discharged
The following procedures may be used to start the engine if the vehicle’s bat-
tery is discharged.
You can also call your Lexus deal er or a qualified repair shop.
1
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6898-2. Steps to take in an emergency
8
When trouble arises
RX350/RX350L_U
■Starting the engine when the battery is discharged
The engine cannot be started by push-starting.
■To prevent battery discharge
●Turn off the headlights and the audio system while the engine is off.
●Turn off any unnecessary electrical components when the vehicle is running at a low
speed for an extended period, such as in heavy traffic.
■When removing the battery terminals
When the battery terminals are removed, the information stored in the ECU is cleared.
Before removing the battery termin als, contact your Lexus dealer.
■Charging the battery
The electricity stored in the battery will disc harge gradually even when the vehicle is not
in use, due to natural discharge and the draini ng effects of certain electrical appliances. If
the vehicle is left for a long time, the battery may discharge, and the engine may be
unable to start. (The battery recharges automatically during driving.)
■When the battery is removed or discharged
●In some cases, it may not be possible to un lock the doors using the smart access system
with push-button start when the battery is discharged. Use the wireless remote control
or the mechanical key to lock or unlock the doors.
●The engine may not start on the first attempt after the battery has recharged but will
start normally after the second attempt. This is not a malfunction.
●The engine switch mode is memorized by the vehicle. When the battery is recon-
nected, the system will return to the mode it was in before the battery was discharged.
Before disconnecting the battery, turn the engine switch off.
If you are unsure what mode the engine switch was in before the battery discharged, be
especially careful when reconnecting the battery.
●The power back door must be initialized. ( P. 138)
■When replacing the battery
●Use a battery with the same case size as the previous battery and an equivalent 20
hour rate capacity (20HR) or greater.
• If the sizes differ, the battery cannot be properly secured.
• If the 20 hour rate capacity is low, even if the time period where the vehicle is not used is a short time, the battery may discharge and the engine may not be able to
start.
●For details, consult your Lexus dealer.

7249-2. Customization
RX350/RX350L_U
■Door lock ( P. 124, 684)
FunctionDefault settingCustomized setting
Unlocking using a mechanical
key
Driver’s door
unlocked in one
step, all doors
unlocked in two
step
All doors unlocked
in one step—O
Automatic door locking function
Shift position
linked door locking
operationOff
OOSpeed linked door
locking operation
Automatic door unlocking func-
tion
Shift position
linked door
unlocking opera-
tionOff
OODriver’s door
linked door
unlocking opera-
tion
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7299-2. Customization
9
Vehicle specifications
RX350/RX350L_U
■Power windows, and moon roof* or panoramic moon roof*
(  P. 187, 191, 195)
*:If equipped
■Moon roof* ( P. 191)
*: If equipped
FunctionDefault settingCustomized setting
Mechanical key linked operationOffOn—O
Wireless remote control linked
operationOffOn (open only)—O
Wireless remote control linked
operation signal (buzzer)OnOff—O
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FunctionDefault settingCustomized setting
Linked operation of components
when mechanical key is used
(open only)
Slide onlyTilt only—O
Linked operation of components
when wireless remote control is
used
Slide onlyTilt only—O
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7339-2. Customization
9
Vehicle specifications
RX350/RX350L_U
■Illumination (P. 524)
*:If equipped
FunctionDefault settingCustomized setting
Time elapsed before the interior
lights turn off15 seconds
Off
OO7.5 seconds
30 seconds
Operation after the engine
switch is turned offOnOff—O
Operation when the doors are
unlockedOnOff—O
Operation when you approach
the vehicle with the electronic
key on your person
OnOff—O
Footwell lights and front center
console lightOnOff—O
Instrument panel ornament
light
* and door trim ornament
lights*OnOff—O
Time elapsed before the outer
foot lights turn off15 seconds
Off
OO7.5 seconds
30 seconds
Operation of the outer foot lights
when you approach the vehicle
with the electronic key on your
person
OnOff—O
Operation of the outer foot lights
when the doors are unlocked
with the power door lock switch
OnOff—O
Operation of the outer foot lights
when a door is openedOnOff—O
Fading out of the outer foot lights
when they turn offLongShort—O
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752
RX350/RX350L_UWhat to do if... (Troubleshooting)
What to do if... (Troubleshooting)
●If you lose your mechanical keys, ne
w genuine mechanical keys can be made
by your Lexus dealer. ( P. 121)
●If you lose your electronic keys, the risk of vehicle theft increases significantly.
Contact your Lexus dealer immediately. ( P. 123)
●Is the electronic key battery weak or depleted? ( P. 623)
●Is the engine switch in IGNITION ON mode?
When locking the doors, turn the engine switch off. (P. 232)
●Is the electronic key left inside the vehicle?
When locking the doors, make sure that you have the electronic key on your
person.
●The function may not operate properly du e to the condition of the radio wave.
( P. 148)
●Is the child-protector lock set?
The rear door cannot be opened from in side the vehicle when the lock is set.
Open the rear door from outside and then unlock the child-protector lock.
( P. 127)
If you have a problem, check the foll owing before contacting your Lexus
dealer.
The doors cannot be locked, unlocked, opened or closed
You lose your keys
The doors cannot be locked or unlocked
The rear door cannot be opened

753What to do if... (Troubleshooting)
RX350/RX350L_U
●Did you press the engine switch while firmly depressing the brake pedal?
( P. 231)
●Is the shift lever in P? ( P. 233)
●Is the electronic key anywhere detectable inside the vehicle? ( P. 146)
●Is the steering wheel unlocked? ( P. 233)
●Is the electronic key battery weak or depleted?
In this case, the engine can be started in a temporary way. (P. 685)
●Is the battery discharged? ( P. 687)
●Is the engine switch in IGNITION ON mode?
If you cannot release the shift lever by depressing the brake pedal with the
engine switch in IGNITION ON mode ( P. 239, 244)
●It is locked automatically to prevent theft of the vehicle. ( P. 233)
●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. 187)
●The auto power off function will be operated if the vehicle is left in
ACCESSORY or IGNITION ON mode (the engine is not operating) for a
period of time. ( P. 233)
If you think something is wrong
The engine does not start
The shift lever cannot be shifted from P even if you depress the brake
pedal
The steering wheel cannot be turned after the engine is stopped
The windows do not open or close by operating the power window
switches
The engine switch is turned off automatically

759Alphabetical index
RX350/RX350L_U
CareAluminum wheels .............................. 577
Exterior....................................................576
Interior ...................................................... 581
Seat belts ............................................... 582
Self-restoring coat .............................576
Cargo capacity............................210, 698
Cargo hooks .......................................... 536
Cargo net hooks ................................... 536
CD player .................................................427
Chains .......................................................385
Child restraint system............................ 55 Booster seats installation................... 64
Convertible seats installation .......... 62
Front passenger occupant classification system ......................... 47
Infant seats definition .............................61
Infant seats installation ........................ 57
Installing CRS with LATCH anchors ................................................... 67
Installing CRS with seat belts ............61
Installing CRS with top tether strap.......................................................... 70
LATCH anchors ................................... 67 Child safety .................................................54
Airbag precautions.............................. 39
Battery precautions ............. 602, 690
Child restraint system......................... 55
How your child should wear the seat belt .............................. 33
Installing child restraints .................... 55
Moon roof precautions ....................194
Panoramic moon roof precautions ........................................ 198
Power back door precautions......140
Power window lock switch.............187
Power window precautions .......... 190
Rear door child-p rotectors ............ 127
Removed key battery precautions ....................................... 624
Seat belt extender precautions .......................................... 35
Seat belt precautions .......................... 35
Seat heater precautions ................... 521
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762Alphabetical index
RX350/RX350L_U
Eco drive mode ..................................... 373
Eco Driving Indicator........................... 105
EDR (Event data recorder) ...................10
Electric Power Steering (EPS) ....... 378Warning light ...................................... 655
Electronic key ......................................... 120 Battery-saving function .....................147
If the electronic key does not operate properly............................ 684
Replacing the battery .......................623
Emergency flashers ............................. 644
Emergency, in case of If a warning buzzer sounds.......... 654
If a warning light turns on.............. 654
If a warning message is displayed.............................................. 661
If the battery is discharged ........... 687
If the electronic key does not operate properly............................ 684
If the engine will not start............... 682
If you have a flat tire ......................... 666
If you lose your keys .................. 121, 123
If you think something is wrong ...................................................652
If your vehicle becomes stuck .... 695
If your vehicle has to be stopped in an emergency .. 645
If your vehicle needs to be towed................................................... 646
If your vehicle overheats ................692 Engine
ACCESSORY mode ..................... 232
Compartment ..................................... 594
Engine switch ........................................ 231
Hood........................................................ 592
How to start the engine.................... 231
Identification number.......................700
If your vehicle has to be stopped in an emergency.......... 645
Ignition switch (engine switch) ..... 231
Overheating......................................... 692
Engine coolant Capacity................................................. 702
Checking .............................................. 598
Preparing and checking before winter ....................................384
Engine coolant temperature gauge ........................................................ 86
Engine immobilizer system .................. 74
Engine oil Capacity.................................................700
Checking ...............................................595
Preparing and checking before winter ....................................384
Engine oil maintenance data ............597
Engine switch ........................................... 231
Enhanced VSC ..................................... 378
EPS (Electronic Power Steering) ........ 378 Warning light .......................................655
Event data recorder (EDR)................... 10
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