engine overheat LEXUS RX350 2016 User Guide

5056-2. Using the air conditioning system and defogger
6
Interior features
RX350_U_OM48E90UHeated steering wheel 
/seat heaters 
/seat ventila-
tors 
 : If equippedHeated steering wheel and seat heater s heat the side grips of the steering
wheel and seats, respectively. Seat ventilators maintain good airflow by blow-
ing air from the seats. WA R N I N G ●
Care should be taken to prevent injury if anyone in the following categories comes in
contact with the steering wheel an d seats when the heater is on:
• Babies, small children, the elderly, the sick and the physically challenged
• Persons with sensitive skin
• Persons who are fatigued
• Persons who have taken alcohol or drugs that induce sleep (s leeping drugs, cold
remedies, etc.) ●
Observe the following precautions to prevent minor burns or overheating:
• Do not cover the seat with a blanket or cushion when using the seat heater.
• Do not use seat heater more than necessary.
NOTICE ●
Do not put heavy objects that have an uneven surface on the seat and do not stick
sharp objects (needles, nails, etc.) into the seat. ●
To prevent battery discharge, do not use the functions when the engine is off.

623
8When trouble arises
RX350_U_OM48E90U 8-1. Essential information
Emergency flashers .................. 624
If your vehicle has to be
stopped in an
emergency................................. 625
8-2. Steps to take in an
emergency
If your vehicle needs to be
towed ........................................... 626
If you think something is
wrong ........................................... 632
Fuel pump shut off
system .......................................... 633
If a warning light turns
on or a warning buzzer
sounds.......................................... 634
If a warning message is
displayed.......................................641
If you have a flat tire................... 646
If the engine will not start ........658
If the shift lever cannot be
shifted from P............................660
If the electronic key does
not operate properly ...............661
If the vehicle battery is
discharged ................................. 665
If your vehicle overheats .........668
If the vehicle becomes
stuck ............................................... 671

6438-2. Steps to take in an emergency
8
When trouble arises
RX350_U_OM48E90U Take the appropriate actions as in structed in the message displayed.
If any of the following messages are displa yed, also refer to this Owner’s Manual.■
If “Shift to P Before Exiting Vehicle” is shown
Message is displayed when the driver’s door is opened without turning the
engine switch off with the shift lever in any position other than P.
Shift the shift lever to P. ■
If “Power Turned Off to Save Battery” is displayed
This message is displayed when the power was cut off due to the automatic
power off function.
The next time the engine is started, increase the engine speed slightly and
maintain it at that spee d for approximately 5 minutes to recharge the battery.■
If “AWD System Overheated Switching to 2WD Mode” or “AWD System
Overheated 2WD Mode Engaged” is displayed (AWD models)
This message may be displayed when driving under extremely high load con-
ditions.
Drive the vehicle at low speeds or stop the vehicle in a safe place with the
engine running until the message is cleared.
If the message is not cleared, have the vehicle inspected by your Lexus dealer.■
If “A New Key has been Registered Contact Your Dealer for Details” is dis-
played
This message will be displayed each time the driver’s door is opened when the
doors are unlocked from the outside for approximately one week after a new
electronic key has been registered.
If this message is displayed but you have not had a new electronic key regis-
tered, ask your Lexus dealer to check if an unknown electronic key (other than
those in your possession) has been registered. ■
When “Headlight System Malfunctio n Visit Your Dealer” is displayed
The following systems may be malfunct ioning. Have the vehicle inspected by
your Lexus dealer immediately. ●
The LED headlight system ●
The automatic headlight leveling system ●
Automatic High Beam (if equipped) ●
AFS (Adaptive Front-lighting System) (if equipped)Other messages displayed on the multi-information display

668 8-2. Steps to take in an emergency
RX350_U_OM48E90U Stop the vehicle in a safe place and tu rn off the air conditioning system, and
then stop the engine.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the engine has cooled down
sufficiently, inspect the hoses and
radiator core (radiator) for any
leaks.
Radiator
Cooling fans If a large amount of coolant leaks,
immediately contact your Lexus
dealer.
The coolant level is satisfactory if it is
between the “FULL” and “LOW”
lines on the reservoir.
Reservoir
“FULL” line
“LOW” line
Radiator capIf your vehicle overheats The following may indicate that your vehicle is overheating. ●
The needle of the engine coolant temperature gauge (  P. 8 5 ) e n t e r s t h e
red zone, or a loss of engine power is experienced. (For example, the vehi-
cle speed does not increase.) ●
“Engine Coolant Temp High Stop in a Safe Place See Owner’s Manual” is
shown on the multi-information display. ●
Steam comes out from under the hood.
Correction procedures 1
2
3
1
2
4
1
2
3
4

735Alphabetical index
RX350_U_OM48E90U Coolant
Capacity ................................................ 678
Checking............................................... 578
Preparing and checking
before winter ................................... 380
Cooling system ..................................... 578
Engine overheating.......................... 668
Cornering lights .................................... 242
Cruise control
Cruise control......................................326
Dynamic radar cruise control....... 314
Dynamic radar cruise control
with full-speed range ................... 302
Cup holders ..............................................514
Curtain shield airbags ........................... 37
Customizable features ....................... 699
Customized mode ............................... 369
Daytime running light system .......... 243
Defogger
Outside rear view mirrors ............ 500
Rear window .......................................500
Windshield ........................................... 500
Differential ............................................... 679
Dimension ............................................... 674
Dinghy towing..........................................219
Display
Dynamic radar cruise control....... 314
Dynamic radar cruise control
with full-speed range ................... 302
LDA (Lane Departure Alert
with steering control) ................... 297
LKA (Lane-Keeping Assist) ........ 288
Multi-information display ..................89
Warning messages............................ 641 Do-it-yourself maintenance............. 570
Doors
Automatic door locking and
unlocking system.............................. 127
Door lock................................................. 126
Outside rear view mirrors .............. 173
Power back door ............................... 130
Rear door child-p rotectors ............ 127
Side doors ............................................... 124
Side windows ........................................ 177
Drive information .....................................93
Drive-start control .......... 193, 227, 232
Driver’s seat belt reminder light .... 636
Driver’s seat position memory.......... 162
Driving
Break-in tips ...........................................194
Correct posture .................................... 28
Driving mode select switch .......... 369
Procedures ............................................. 192
Winter drive tips ............................... 380
Driving position memory .................... 162
Memory recall function ....................165
Dynamic radar cruise control ........... 314
Dynamic radar cruise control
with full-speed range....................... 302
Dynamic Torque Control AWD
system .....................................................375D

736 Alphabetical index
RX350_U_OM48E90U Eco drive mode ..................................... 369
Eco Driving Indicator........................... 104
EDR (Event data recorder) ...................10
Electric Power Steering (EPS) ....... 374
Warning light ...................................... 635
Electronic key ......................................... 120
Battery-saving function .....................147
If the electronic key does not
operate properly.............................. 661
Replacing the battery ...................... 603
Emergency flashers ............................. 624
Emergency, in case of
If a warning buzzer sounds...........634
If a warning light turns on...............634
If a warning message is
displayed.............................................. 641
If the battery is discharged ........... 665
If the electronic key does not
operate properly.............................. 661
If the engine will not start............... 658
If you have a flat tire ......................... 646
If you lose your keys .................. 121, 123
If you think something is
wrong ...................................................632
If your vehicle becomes stuck .......671
If your vehicle has to
be stopped in an emergency ...625
If your vehicle needs to be
towed....................................................626
If your vehicle overheats ............... 668 Engine
ACCESSORY mode ....................... 221
Compartment ..................................... 574
Engine switch ...................................... 220
Hood........................................................ 572
How to start the engine.................. 220
Identification number ....................... 676
If your vehicle has to be
stopped in an emergency.......... 625
Ignition switch (engine switch) ... 220
Overheating........................................ 668
Engine coolant
Capacity ................................................. 678
Checking ............................................... 578
Preparing and checking
before winter ................................... 380
Engine coolant temperature
gauge ........................................................ 85
Engine immobilizer system .................. 74
Engine oil
Capacity ................................................. 676
Checking ............................................... 575
Preparing and checking
before winter ................................... 380
Engine switch ......................................... 220
Enhanced VSC ......................................374
EPS
(Electronic Power Steering) .........374
Warning light .......................................635
Event data recorder (EDR)................... 10E

741Alphabetical index
RX350_U_OM48E90U Odometer ................................................ 103
Oil
Engine oil................................................676
Rear differential oil .............................679
Transfer oil .............................................679
Opener
Hood ........................................................ 572
Power back door .................................. 131
Outside rear view mirrors .................. 173
Adjusting and folding.........................173
Blind Spot Monitor (BSM)........... 355
Linked mirror function when
reversing .............................................. 175
Mirror position memory .................. 162
Outside rear view mirror
defoggers .......................................... 500
Outside temperature display ............. 85
Overheating ........................................... 668
Paddle shift switches ................. 230, 231
Panic mode ................................................ 121
Panoramic moon roof ......................... 185
Jam protection function ................... 186
Operation ............................................... 185
Parking brake......................................... 235
Parking brake engaged
warning buzzer/message.......... 237
Warning light ...................................... 635
Parking lights
Light switch .............................................241
Replacing light bulbs ......................... 610
PCS (Pre-Collision System) ............ 270
Warning light ...................................... 636 Personal lights .........................................510
Power back door ...................................130
Touchless power back door.......... 132
Wireless remote control................. 130
Power back door opener and
closer .......................................................130
Power easy access system ................. 162
Power outlets ............................... 531, 532
Power steering (Electric Power
Steering system).................................374
Warning light .......................................635
Power windows
Door lock linked window
operation .............................................. 179
Jam protection function....................178
Operation................................................ 177
Window lock switch .......................... 177
Pre-Collision System (PCS).............270
Warning light ....................................... 636
Radar cruise control (dynamic
radar cruise control).......................... 314
Radar cruise control
(dynamic radar cruise control
with full-speed range) ..................... 302
Radiator.....................................................579
Radio ........................................................... 416
Rear Cross Traffic Alert .................... 355
Rear door sunshades.......................... 534
Rear seat
Folding down the rear
seatbacks .............................................153
Rear seat heaters ................................. 507O
P R
* : Refer to the “NAVIGATION SYSTEM OWNER’S MANUAL”.