2020 LEXUS RX450H key battery

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
2

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.

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
C

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
E

765Alphabetical index
RX350/RX350L_U
I/M test .....................................................589
ICS (Intelligent Clearance Sonar) ...... 336 Indicator..................................................... 82
Warning light ...................................... 656
Warning messages.............. 340, 347
Identification Engine ..................................................... 700
Vehicle ................................................... 699
Ignition switch (engine switch)..........231
Illuminated entry system .................... 527
Immobilizer system..................................74
Indicators .................................................... 80
Initialization Engine oil maintenance data........597
Items to initialize..................................735
Power back door ................................ 138
Tire pressure warning system .... 605
Inside rear view mirror ........................ 182
Instrument panel light control ............ 88
Intelligent Clearance Sonar (ICS) ....................................................... 336 Indicator..................................................... 82
Warning light ...................................... 656
Warning messages.............. 340, 347
Interior lights........................................... 524 Switch...................................................... 525
Wattage ................................................. 705
Intuitive parking assist......................... 326 Jack
Positioning a floor jack....................593
Vehicle-equipped jack ................... 667
Jack handle .............................................. 667
Jam protection function Electronic sunshade...........................196
Moon roof ............................................... 192
Panoramic moon roof.......................196
Power back door openerand closer ........................................... 138
Power windows................................... 188
Keyless entry Smart access system with push-button start ..............................146
Wireless remote control....... 120, 130
Keys ............................................................. 120 Battery-saving function ....................148
Electronic key ........................................120
Engine switch ........................................ 231
If the electronic key does not operate properly ............................684
If you lose your keys........................... 123
Key number plate ................................120
Keyless entry ..........................................120
Mechanical key.......................................121
Replacing the battery ...................... 623
Warning buzzer................................... 125
Wireless remote control..................120
Knee airbags .............................................. 37
IJ
K
*: Refer to the “NAVIGATION SYSTEM OWNER’S MANUAL”.

769Alphabetical index
RX350/RX350L_U
Radar cruise control (dynamic radar cruise control
with full-speed range) .....................300
Radiator .................................................... 599
Radio.......................................................... 420
Rear automatic air conditioning system ..................................................... 518
Rear Cross Traffic Alert ......................313
Rear Cross Traffic Auto Brake.......350
Rear door sunshades .......................... 554
Rear passengers' seat belt reminder light ..................................... 656
Rear seat Folding down the rear seatbacks ............................................. 157
Rear side marker lights Light switch ........................................... 252
Replacing light bulbs ....................... 630
Rear turn signal lights Replacing light bulbs ....................... 630
Turn signal lever .................................246
Wattage ................................................. 705
Rear view mirror Inside rear view mirror ..................... 182
Outside rear view mirrors .............. 184 Rear window defogger ........................ 513
Rear window wiper .............................. 267
Refueling...................................................269
Capacity.................................................700
Fuel types...............................................700
Opening the fuel tank cap ............ 269
When the fuel filler door cannot be opened ..........................272
Remote Touch
*.....................................496
Replacing Electronic key battery ..................... 623
Fuses ........................................................ 625
Light bulbs.............................................630
Tires ..........................................................666
Windshield wiper inserts ................. 621
Reporting safety defects for U.S. owners ......................................... 738
Resetting the message indicating maintenance is required ................ 585
Rev indicator ............................................. 88
Rev peak ..................................................... 88
R