2015 LEXUS RX450h check engine

7084-3. Do-it-yourself maintenance
Light bulbs You may replace the following bulbs by yourself. The difficulty level of
replacement varies depending on the bulb. If necessary bulb replacement
seems difficult to perform, contact your Lexus dealer.
For more information about replacing other light bulbs, contact your Lexus
dealer.
■ Preparing for light bulb replacement
Check the wattage of the light bulb to be replaced. (  P. 8 0 9 )
■ Removing the engine compartment covers
 P. 6 5 5
■ Turning off the power back door main switch
 P. 7 7
■ Front bulb locations
Vehicles with halogen headlights Headlight high beamHeadlight low beam
Front turn signal light

7525-2. Steps to take in an emergency
(Flashes)
(If equipped) Indicates that there is a
high possibility of a fron-
tal collision, or that the
pre-collision braking
function is operating
A buzzer also sounds.
At the same time,
will appear on
the head-up display (the
image flashes). Slow the vehicle by apply-
ing the brakes.
(Flashes)
(If equipped) Indicates that your vehi-
cle is nearing the vehicle
ahead (in radar cruise
mode)
A buzzer also sounds.
At the same time,
will appear on
the head-up display (the
image flashes). Slow the vehicle by apply-
ing the brakes.
Indicates that the engine
has overheated
A buzzer also sounds. Stop and check.
(  P. 7 8 8 )Wa r n i n g m e s s a g e Details Correction procedure

5
When trouble arises
7915-2. Steps to take in an emergency
Add coolant if necessary. Water can be used in an emer-
gency if coolant is unavailable.
Start the hybrid system and check for the multi-information dis-
play.
If the message does not disappear:
Stop the hybrid system and contact your Lexus dealer.
If the message is not displayed:
Have the vehicle inspected at the nearest Lexus dealer.STEP 5
CAUTION■
To prevent an accident or injury when in specting under the hood of your vehicle●
If steam is seen coming from under the hood, do not open the hood until the
steam has subsided. The engine compartm ent may be very hot, causing serious
injuries such as burns.●
After the hybrid system has been turned off, check that the indicator on the
“POWER” switch and the “READY” indicator are off.
When the hybrid system is operating, the gasoline engine may automatically
start, or the cooling fans may suddenly operate even if the gasoline engine stops.
Do not touch or approach rotating parts such as the fans, which may lead to fin-
gers or clothing (especially a tie, a scarf or a muffler) getting caught, resulting in
serious injury.●
Do not loosen the radiator cap while the hybrid system and radiator are hot.
Serious injuries, such as burns, may re sult from hot coolant and steam released
under pressure. STEP 6

8026-1. Specifications
Lubrication system
*: The engine oil capacity is a reference quantity to be used when changing
the engine oil. Warm up the engine and turn off the hybrid system, wait
more than 5 minutes, and check the oil level on the dipstick.
■ Engine oil selection
“Toyota Genuine Motor Oil” is used in your Lexus vehicle. Use Lexus
approved “Toyota Genuine Motor Oil” or equivalent to satisfy the follow-
ing grade and viscosity.
Oil grade: ILSAC GF-5 multigrade engine oilOil capacity
(Drain and refill 
reference*)
With filter 6.4 qt. (6.1 L, 5.4 Imp. qt.)
Without filter 6.0 qt. (5.7 L, 5.0 Imp. qt.)

864Alphabetical index
Engine
Accessory mode ................................. 177
Compartment .....................................654
Hood......................................................... 651
How to start the hybrid
system .................................................... 177
Identification number....................... 799
If the hybrid system will
not start ................................................777
Ignition switch........................................ 177
Overheating.........................................788
“POWER” switch ................................ 177
Engine compartment cover .............655
Engine coolant
Capacity ................................................ 804
Checking ...............................................659
Preparing and checking
before winter .................................... 302
Engine coolant temperature
gauge....................................................... 197
Engine oil
Capacity .................................................802
Checking ...............................................656
Preparing and checking
before winter .................................... 302
EPS ...............................................................271
EV drive mode ........................................ 183
Event data recorder ............................... 25 Floor mat ................................................... 610
Fluid
Brake .......................................................806
Washer................................................... 663
Fog lights
Replacing light bulbs ....................... 708
Switch .........................................................221
Wattage .................................................809
Footwell light .......................................... 582
Front fog lights
Replacing light bulbs ....................... 708
Switch .........................................................221
Wattage .................................................809
Front passenger occupant
classification system ...........................145
Front passenger's seat belt
reminder light ..................................... 736
Front seats
Adjustment .............................................. 86
Driving position memory ..................93
Flattening seatbacks ............................87
Front side marker lights
Replacing light bulbs ....................... 708
Front turn signal lights
Replacing light bulbs ....................... 708
Wattage .................................................809F

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”.