key battery LEXUS RX450h 2015 Owner's Manual

5
When trouble arises
7775-2. Steps to take in an emergency
If the hybrid system will not start Reasons for the hybrid system not starting vary depending on the situation.
Check the following and perform the appropriate procedure:
■ The hybrid system will not start even though the correct starting
procedure is being followed. (  P. 1 7 7 )
One of the following may be the cause of the problem:
● The electronic key may not be functioning properly. (  P. 7 8 2 )
● There may be a malfunction in the immobilizer system. (  P. 1 2 4 )
● There may be a malfunction in the steering lock system.
● The hybrid system may be malfunc tioning due to an electrical
problem such as an open circ uit or a blown fuse. However,
depending on the type of malfunc tion, an interim measure is avail-
able to start the hybrid system. (  P. 7 7 8 )
■ The interior lights and headlights are dim, or the horn does not
sound or sounds at a low volume.
One of the following may be the cause of the problem:
● The 12-volt battery may be discharged. (  P. 7 8 4 )
● The 12-volt battery terminal co nnections may be loose or cor-
roded.
■ The interior lights and headlights do not turn on, or the horn does
not sound.
One of the following may be the cause of the problem:
● One or both of the 12-volt battery terminals may be discon-
nected.
● The 12-volt battery may be discharged. (  P. 7 8 4 )
Contact your Lexus dealer if the problem cannot be repaired, or if
repair procedures are unknown.

5
When trouble arises
7815-2. Steps to take in an emergency
If the electronic key do es not operate properly
Locking and unlocking the side doors and key linked functions
Use the mechanical key (  P. 5 2 )
in order to perform the following
operations (driver’s door only):
Locks all the doors
Closes the windows and moon
roof (turn and hold)
Unlocks the door Turning the key rearward unlocks
the driver's door. Turning the key
once again unlocks the other
doors.
Opens the windows and moon
roof (turn and hold)If communication between the electron ic key and vehicle is interrupted
(  P. 62) or the electronic key cannot be used because the battery is
depleted, the smart access system with push-button start and wireless
remote control cannot be used. In such cases, the doors can be opened and
the hybrid system can be started by following the procedure below.

5
When trouble arises
7835-2. Steps to take in an emergency
■
Stopping the hybrid system
Shift the shift lever to P and press the “POWER” switch as you normally do when
stopping the hybrid system.■
Replacing the key battery
As the above procedure is a temporary measure, it is recommended that the elec-
tronic key battery be replaced immediately when the battery is depleted.
(  P. 6 8 7 )■
Changing “POWER” switch modes
Within 10 seconds of the buzzer sounding, release the brake pedal and press the
“POWER” switch.
The hybrid system does not start and modes will be changed each time the switch is
pressed. (  P. 1 7 8 )

5
When trouble arises
7855-2. Steps to take in an emergency
■
Starting the hybrid system when the 12-volt battery is discharged
The hybrid system cannot be started by push-starting.■
To prevent 12-volt battery discharge ●
Turn off the headlights and the audio sy stem while the hybrid system is off.●
Turn off any unnecessary electrical compon ents when the vehicle is running at a
low speed for an extended period, such as in heavy traffic.■
When the 12-volt battery is removed or discharged ●
The power back door must be initialized.
(  P. 8 3 7 )●
The hybrid system may not start. (
 P. 6 6 8 )
●
Make sure that the key is not inside th e vehicle when recharging or replacing
the 12-volt battery. The key may be locked in the vehicle if the alarm is activated.
(  P. 1 2 8 ) Start the engine of the second vehicle. Increase the engine
speed slightly and maintain that level for approximately 5 min-
utes to recharge the 12-volt battery of your vehicle.
Open and close any of the doors of your vehicle with the
“POWER” switch off.
Maintain the engine sp eed of the second ve hicle and start the
hybrid system of your vehicle by turning the “POWER” switch
to ON mode.
Make sure the “READY” indicat or comes on. If the indicator
does not come on, contact your Lexus dealer.
Once the hybrid system has st arted, remove the jumper cables
in the exact reverse order from which they were connected.
Once the hybrid system starts, have the vehicle inspected at your
Lexus dealer as soon as possible. STEP 4
STEP 5
STEP 6
STEP 7
STEP 8

862Alphabetical index
Card key ....................................................... 51
Care
Exterior ................................................... 634
Interior ..................................................... 637
Seat belts................................................638
Cargo capacity ....................................... 301
Cargo hooks ............................................ 612
CD changer
CD ...............................................380, 485
MP3 .............................................. 381, 493
WMA disc.................................. 381, 493
CD player ................................... 380, 485
Chains .......................................................302
Child restraint system
Booster seats, definition .................. 150
Booster seats, installation ................154
Convertible seats, definition ......... 150
Convertible seats, installation........154
Front passenger occupant
classification system........................145
Infant seats, definition........................ 150
Infant seats, installation ......................154
Installing CRS with LATCH
system ................................................... 155
Installing CRS with seat belts......... 157
Installing CRS with top tether
straps ....................................................... 161
Child safety
Airbag precautions............................ 140
Back door prec autions......................80
Child restraint system....................... 150
Child-protectors ....................................73
How your child should wear
the seat belt .......................................... 101
Installing child restraints ...................154 Moon roof precautions ......................118
Power window lock switch .............. 112
Power window precautions............. 114
Removed electron ic key battery
precautions .......................................688
Seat belt extender precautions .... 104
Seat belt precautions......................... 102
Seat heater precautions................. 605
12-volt battery
precautions ...........................668, 784
Child-protectors...................................... 73
Cleaning
Exterior ................................................... 634
Interior......................................................637
Seat belts ............................................... 638
Clock* ....................................................... 597
Coat hooks..............................................608
Coin holder ............................................. 592
Compass .................................................. 622
Condenser ................................................661
Console box ...........................................590
Coolant
Engine coolant.................................... 659
Power control unit coolant........... 659
Cooling system
Hybrid system ov erheating.......... 788
Cornering assist sensors ................... 248
Cruise control
Cruise control ...................................... 232
Dynamic radar cruise control ......236
Cup holders ............................................588
Curtain shield airbags ..........................132
Customizable features ....................... 825C

863Alphabetical index
Daytime running light system............ 219
Defogger*
Rear window........................................358
Side mirrors..........................................358
Dimensions ............................................. 798
Dinghy towing ........................................324
Display
Energy flow ............................................. 39
Multi-information display............... 206
Trip information .................................. 209
Warning message .............................743
Do-it-yourself maintenance............. 648
Door courtesy lights
Door courtesy lights ........................ 582
Wattage ................................................ 809
Door lock
Back door .................................................75
Side door ................................................... 72
Wireless remote control................... 69
Door pockets ......................................... 587
Doors
Back door .................................................75
Door lock ................................ 56, 69, 72
Door windows ........................................ 112
Power back door ..................................75
Side door ................................................... 72
Side mirrors............................................109
Driver's seat belt reminder light .....736
Driving
Break-in tips ........................................... 167
Correct posture ...................................130
Procedures .............................................166
Utility vehicle
precautions ........................................292
Winter driving tips ............................ 302 Driving position memory ...................... 93
Electric power steering ........................271
Electronic features control ...............206
Electronic key
If the electronic key does not
operate properly ............................. 781
Emergency flashers
Switch....................................................... 724
Emergency, in case of
If a warning buzzer sounds........... 733
If a warning light turns on............... 733
If a warning message is
displayed............................................. 743
If the back door opener is
inoperative ............................................ 79
If the electronic key does not
operate properly ............................. 781
If the hybrid system will
not start ................................................ 777
If the shift lever cannot be
shifted from P ................................... 779
If the vehicle has a discharged
12-volt battery...................................784
If you have a flat tire ......................... 764
If you lose your keys ........................ 780
If you think something is
wrong ................................................... 732
If your vehicle becomes stuck ..... 793
If your vehicle has to be
stopped in an emergency ..........795
If your vehicle needs to be
towed.................................................... 725
If your vehicle overheats ............... 788D
E
*: For vehicles with a navigation system, refer to the “Navigation System Owner’s Manual”.

868Alphabetical index
Parking assist sensors* .......................248
Parking brake .......................................... 195
Parking lights
Replacing light bulbs........................708
Switch ........................................................ 217
PCS
Function .................................................. 278
Pre-collision braking off
switch ................................................... 279
Warning light ....................................... 734
Personal lights
Switch ......................................................583
Phone*........................................... 429, 552
Power back door ..................................... 75
Power control unit coolant
Capacity ................................................ 804
Checking ...............................................659
Preparing and checking
before winter .................................... 302
Power easy access system................... 95
Power outlet............................................. 601
“POWER” switch.................................... 177
Power windows ........................................ 112
Pre-collision system
Function .................................................. 278
Pre-collision braking off
switch ................................................... 279
Warning light ....................................... 734 Radar cruise control............................ 236
Radiator ......................................................661
Radio* ............................................ 365, 477
Rear seat entert ainment system*
Rear seats
Folding down ......................................... 89
Seat adjustment..................................... 89
Rear turn signal lights
Replacing light bulbs ....................... 708
Wattage .................................................809
Rear view mirror
Compass ................................................622
Inside rear view mirror ..................... 107
Outside rear view mirrors ..............109
Rear view monitor
system* ...................................... 258, 266
Rear window defogger* ....................358
Rear window wiper.............................. 229
Remote Touch*
Replacing
Electronic key battery ..................... 687
Fuses ........................................................ 689
Light bulbs ............................................ 708
Tires...........................................................764
Wireless remote control
battery ................................................. 687
Reporting safety defects for
U.S. owners..........................................840
Reset the maintenance data ..............641
Roof luggage carrier........................... 296P R

873Alphabetical index
Warning messages
Anti-lock brake system .................. 745
AWD system ............................744, 745
Brake lamp system ........................... 745
Brake system ........................................743
Dynamic radar cruise
control system ..................... 745, 748
Electric power steering .................. 745
Engine oil maintenance.................. 748
Engine oil pressure............................744
Engine overheat................................. 748
Headlight leveling ............................. 745
Hood ....................................................... 748
Intuitive parking assist ......... 745, 748
Low fuel .................................................. 748
Moon roof ............................................. 748
Open door ........................................... 748
Parking brake ...................................... 748
Pre-collision system ............. 745, 748
Smart access system with
push-button start............................ 756
SRS airbags .......................................... 745
Steering lock ........................................ 745
Washer fluid......................................... 748 Washer
Checking .............................................. 663
Preparing and checking
before winter ....................................302
Switch....................................................... 223
Washing and waxing ........................... 634
Weight
Cargo capacity .................................... 301
Load limits .............................................. 301
Weight.................................................... 798
Wheels ......................................................683
Window glasses ...................................... 112
Window lock switch ............................... 112
Windows
Power windows ..................................... 112
Rear window defogger* ............... 358
Washer ................................................... 223
Windshield wiper de-icer* ...............360
Windshield wipers................................ 223
Wireless remote control....................... 69
Wireless remote control key
Replacing the battery...................... 687
WMA disc* ...................................381, 493
*: For vehicles with a navigation system, refer to the “Navigation System Owner’s Manual”.

874What to do if...
What to do if... A tire punctures P. 76 4
If you have a flat tire
The hybrid system does not start P. 777
If the hybrid system will not start P. 1 2 4
Immobilizer system P. 7 8 4
If the vehicle 12-volt battery is discharged
The shift lever cannot be
moved out P. 7 7 9
If the shift lever cannot be shifted
from P
The engine coolant temperature
gauge enters the red zone
Steam can be seen coming
from under the hood P. 7 8 8
If your vehicle overheats
The key is lost P. 7 8 0
If you lose your keys
The 12-volt battery runs out P. 7 8 4
If the vehicle 12-volt battery is discharged
The doors cannot be locked P. 7 2
Side doors P. 7 5
Back door
The horn begins to sound P. 1 2 6
Alarm
The vehicle is stuck in mud or
sand P. 7 9 3
If the vehicle becomes stuck