
5717-2. Steps to take in an emergency
7
When trouble arises
RX450h_U_OM0E013U
■When exchanging the 12-volt battery
●Use a Central Degassing type 12-volt battery (European Regulations). Also, use 12-volt
batteries with case sizes similar to one prior the exchange and an equivalent 20 hour
rate capacity (20HR) or greater.
• If the sizes differ, the 12-volt 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 12-volt battery may discharge and hybrid system may not be
able to start.
●After exchanging, firmly attach the following items to the exhaust hole of the 12-volt
battery.
For details, consult your Lexus dealer. • Use the exhaust hose that was attached to
the 12-volt battery before exchanging and
confirm that it is firmly connected to the
hole section of the vehicle.
• Use the exhaust hole plug included with the 12-volt battery exchanged or the one
installed on the battery prior to the
exchange. (Depending on the 12-volt bat-
tery to be exchanged, the exhaust hole may
be plugged.)
Exhaust hole plug
Exhaust hole
Exhaust hose
Hole section of the vehicle
1
2
3
4

5858-1. Specifications
8
Vehicle specifications
RX450h_U_OM0E013U
*: The engine oil capacity is a reference quantity to be used when changing the engineoil. Warm up the engine and turn off the hybrid system, wait more than 5 minutes, and
check the oil level on the dipstick.
Hybrid battery (traction battery)
TypeNickel-Metal hydride battery
Voltage9.6 V/module
Capacity6.5 Ah (3HR)
Quantity30 modules
Overall voltage288 V
Lubrication system
Oil capacity
(Drain and refill — reference
*)
With filterVehicles with towing package
5.8 qt. (5.5 L, 4.8 Imp. qt.)
Vehicles without towing package
5.7 qt. (5.4 L, 4.8 Imp. qt.)
Without filter5.6 qt. (5.3 L, 4.7 Imp. qt.)

5878-1. Specifications
8
Vehicle specifications
RX450h_U_OM0E013U
*: The coolant capacity is a reference quantity. If replacement is necessary, contact your Lexus dealer.
Cooling system
Capacity*
Gasoline engine
10.7 qt. (10.1 L, 8.9 Imp. qt.)
Power control unit
2.0 qt. (1.9 L, 1.7 Imp. qt.)
Coolant type
Use either of the following: • “Toyota Super Long Life Coolant”
• Similar high-quality ethylene glycol-based
non-silicate, non-amine, non-nitrite, and non-
borate coolant with long-life hybrid organic
acid technology
Do not use plain water alone.
Ignition system (spark plug)
MakeDENSO FK20HBR8
Gap0.03 in. (0.8 mm)
NOTICE
■Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust the spark plug gap.
Electrical system
12-volt battery
Open voltage at 68F (20 C):
12.6 V or higher: Fully charged
12.2 — 12.4 V: Half charged
12.0 V or lower: Discharged
(Voltage is checked 20 minutes after the hybrid
system and all lights are turned off.)
Charging rates5 A max.

6028-1. Specifications
RX450h_U_OM0E013U
Production options weight
The combined weight of in stalled regular production
options weighing over 5 lb. (2.3 kg) in excess of the
standard items which they re place, not previously con-
sidered in curb weight or accessory weight, including
heavy duty brakes, ride levelers, roof rack, heavy duty
12-volt battery, and special trim
RimA metal support for a tire or a tire and tube assembly
upon which the tire beads are seated
Rim diameter
(Wheel diameter)Nominal diameter of the bead seat
Rim size designationRim diameter and width
Rim type designationThe industry manufacturer’s designation for a rim by
style or code
Rim widthNominal distance between rim flanges
Vehicle capacity weight
(Total load capacity)The rated cargo and luggage load plus 150 lb. (68 kg)
times the vehicle’s desi gnated seating capacity
Vehicle maximum load on
the tireThe load on an individual tire that is determined by dis-
tributing to each axle its share of the maximum loaded
vehicle weight, and dividing by two
Vehicle normal load on the
tire
The load on an individual tire that is determined by dis-
tributing to each axle its sh are of curb weight, accessory
weight, and normal occupant weight (distributed in
accordance with Table 1
* below), and dividing by two
Weather sideThe surface area of the rim not covered by the inflated
tire
BeadThe part of the tire that is made of steel wires, wrapped
or reinforced by ply cords an d that is shaped to fit the
rim
Tire related termMeaning

642Alphabetical index
RX450h_U_OM0E013U
CareAluminum wheels ............................. 459
Exterior................................................... 458
Interior .....................................................462
Seat belts ................................................463
Self-restoring coat ............................ 458
Cargo capacity............................ 212, 582
Cargo hooks ...........................................427
Cargo net hooks ....................................427
Chains .........................................................391
Child restraint system............................ 59 Booster seats installation...................68
Convertible seats installation ..............................................66
Front passenger occupant classification system ...........................51
Infant seats definition ...........................65
Infant seats installation ..........................61
Installing CRS with LATCH anchors ..................................................... 71
Installing CRS with seat belts ..........................................................65
Installing CRS with top tether strap.......................................................... 74
LATCH anchors ..................................... 71 Child safety
.................................................... 58
12-volt battery precautions ...........................485, 572
Airbag precautions................................ 41
Child restraint system......................... 59
How your child should wear the seat belt .............................. 34
Installing child restraints .................... 59
Moon roof precautions ....................196
Panoramic moon roof precautions .......................................200
Power back door precautions ......................................... 152
Power window lock switch............ 189
Power window precautions ........... 192
Rear door child-p rotectors ............139
Removed key battery precautions ....................................... 507
Seat belt extender precautions .......................................... 36
Seat belt precautions .......................... 36
Seat heater precautions ................... 414
Child-protectors .................................... 139
Cleaning ....................................... 458, 462 Aluminum wheels .............................. 459
Exterior ...................................................458
Interior ..................................................... 462
Seat belts................................................ 463
Clock................................................. 97, 433
Coat hooks ..............................................444
Condenser.............................................. 480
Console box ............................................422
Consumption screen .................. 106, 124
C

652Alphabetical index
RX450h_U_OM0E013U
Radar cruise control (dynamic radar cruise control) ........................ 323
Radar cruise control (dynamic radar cruise control
with full-speed range) ........................ 311
Radiator ....................................................480
Rear Cross Traffic Alert .................... 363
Rear door sunshades .......................... 443
Rear seat Folding down the rear seatbacks ............................................. 165
Rear seat heaters....................................416
Rear side marker lights Light switch ............................................ 251
Replacing light bulbs ......................... 513
Rear turn signal lights Replacing light bulbs ......................... 513
Turn signal lever ................................. 244
Wattage ................................................. 590
Rear view mirror Inside rear view mirror ..................... 183
Outside rear view mirrors .............. 185
Rear window defogger ...................... 409
Rear window wiper.............................. 265 Refueling................................................... 267
Capacity.................................................584
Fuel types...............................................584
Opening the fuel tank cap ............ 267
When the fuel filler door cannot be opened ......................... 269
Regenerative braking.............................78
Remote Touch
*.................................... 398
Replacing Electronic key battery .................... 506
Fuses ....................................................... 508
Light bulbs...............................................513
Tires .......................................................... 549
Windshield wiper inserts ...............504
Reporting safety defects for U.S. owners ...................................622
Resetting the message indicating maintenance is required .................466
Rev indicator ..............................................99
Rev peak ......................................................99
Road accident cautions ........................ 83
R