2015 LEXUS RX450h tow

6484-3. Do-it-yourself maintenance
Do-it-yourself service precautions If you perform maintenance by yourself, be sure to follow the correct pro-
cedures as given in these sections.
Items Pa r t s a n d t o o l s
12-volt battery condition (  P. 664
) •Grease
• Conventional wrench
(for terminal clamp bolts)
Brake fluid level (  P. 6 6 2 ) • FMVSS No.116 DOT 3 or SAE
J1703 brake fluid
•Rag or paper towel
• Funnel (used only for adding brake
fluid)
Engine/power control unit coolant
level (  P. 6 5 9 ) • “Toyota Super Long Life Coolant”
or a similar high quality ethylene
glycol based non-silicate, non-
amine, non-nitrite and non-borate
coolant with long-life hybrid
organic acid technology.
For the U.S.A.:
“Toyota Super Long Life Coolant”
is pre-mixed with 50% coolant and
50% deionized water.
For Canada:
“Toyota Super Long Life Coolant”
is pre-mixed with 55% coolant and
45% deionized water.
• Funnel (used only for adding cool-
ant)

6494-3. Do-it-yourself maintenance
4
Maintenance and care Items Pa r t s a n d t o o l s
Engine oil level (  P. 6 5 6 ) • “Toyota Genuine Motor Oil” or
equivalent
•Rag or paper towel
• Funnel (used only for adding
engine oil)
Fuses (  P. 6 8 9 ) • Fuse with same amperage rating as
original
Tire inflation pressure (  P. 6 7 9 ) • Tire pressure gauge
• Compressed air source
Headlight aim (  P. 7 0 5 ) • Phillips-head screwdriver
Radiator and condenser (  P. 6 6 1 )

Wa s h e r f l u i d (  P. 663) • Water or washer fluid containing
antifreeze (for winter use)
• Funnel (used only for adding water
or washer fluid)

6584-3. Do-it-yourself maintenance
■
Engine oil consumption
A certain amount of engine oil will be consumed while driving. In the following situ-
ations, oil consumption may increase, and engine oil may need to be refilled in
between oil maintenance intervals. ●
When the engine is new, for example di rectly after purchasing the vehicle or
after replacing the engine●
If low quality oil or oil of an inappropriate viscosity is used●
AWD models with towing package: When driving at high engine speeds or with
a heavy load, when towing, or when driving while accelerating or decelerating
frequently●
2WD models and AWD models without towing package: When driving at high
engine speeds or with a heavy load, or when driving while accelerating or
decelerating frequently●
When leaving the engine id ling for a long time, or when driving frequently
through heavy traffic
CAUTION■
Used engine oil ●
Used engine oil contains potentially harmful contaminants which may cause skin
disorders such as inflammati on or skin cancer, so care should be taken to avoid
prolonged and repeated contact. To remove used engine oil from your skin, wash
thoroughly with soap and water.●
Dispose of used oil and filters only in a safe and acceptable manner. Do not dis-
pose of used oil and filters in househol d trash, in sewers or onto the ground.
Call your Lexus dealer, service station or auto parts store for information con-
cerning recycling or disposal.
●
Do not leave used engine oil within the reach of children.

6774-3. Do-it-yourself maintenance
4
Maintenance and care CAUTION■
Tire pressure warning system operation
The tire pressure warning system may not provide warning immediately if a tire
bursts or if sudden air leakage occurs.■
When inspecting or replacing tires
Observe the following precautions to prevent accidents. Failure to do so may cause
damage to parts of the drive train, as we ll as dangerous handling characteristics,
which may lead to an accident resu lting in death or serious injury.●
Do not mix tires of different makes, mode ls or tread patterns. Also, do not mix
tires of remarkably different treadwear.●
Do not use tire sizes other th an those recommended by Lexus.●
Do not mix differently constructed tires (radial, bias-belted or bias-ply tires).●
Do not mix summer, all season and snow tires.●
Do not use tires that have been used on another vehicle.
Do not use tires if you do not know how they were used previously.●
Do not tow if your vehicle has a compact spare tire installed.■
When initializing the tire pressure warning system
Do not push the tire pressure warning reset switch without first adjusting the tire
inflation pressure to the specified level. Otherwise, the tire pressure warning light
may not come on even if the tire inflation pressure is low, or it may come on when
the tire inflation pressure is actually normal.

6964-3. Do-it-yourself maintenance
13
DCDC 150 A IG1 MAIN, TOWING BATT,
DEICER, TOWING, STOP, RDI FAN
NO. 1, ABS NO. 1, RR DEF, AIR SUS,
HEATER, RDI FAN NO. 2, H-LP
CLN, PBD, ECU-IG1 NO. 1, ECU-
IG1 NO. 3, GAUGE NO. 1, ECU-IG1
NO. 2, EPS, FR WIP, RR WIP, FR
WASH, RR WASH, RH S-HTR, LH S-
HTR, TAIL, PANEL, D/L ALT B, FR
FOG, FR DOOR, FL DOOR, RR
DOOR, RL DOOR, PSB, P-SEAT LH,
P-SEAT RH, TI&TE, FUEL OPN, DR
LOCK, OBD, RR FOG, S/ROOF,
4WD, INVERTER, ECU-ACC, P/
POINT, CIG, RADIO NO. 214
AMP1 30 A Audio system15
EFI MAIN 30 A Multiport fuel injection system/
sequential multiport fuel injection sys-
tem, EFI NO. 1, EFI NO. 2, F/PMP16
AMP2 30 A Audio system17
IG2 MAIN 30 A IGN, GAUGE NO. 2, ECU IG218
IP J/B 25 A Power door lock system19
STR LOCK 20 A Starter system20
RAD NO. 3 15 A Meters and gauges, navigation sys-
tem, audio system21
HAZ 15 A Emergency flashers
22
ETCS 10 A Multiport fuel injection system/
sequential multiport fuel injection sys-
tem
23
RAD NO. 1 10 A Audio system, navigation systemFuse Ampere Circuit

6984-3. Do-it-yourself maintenance
35
ECU-IG1 NO. 4 10 A Air conditioning system, rear window
defogger, electronically controlled
brake system, electric cooling fans36
BK/UP LP 7. 5 A Back-up lights37
ECU-IG1 NO. 5 15 A Air conditioning system38
ECU-IG1 NO. 6 10 A Head light cleaner, cruise control, air
conditioning system, Blind Spot Moni-
tor39
EFI NO. 2 10 A Multiport fuel injection system/
sequential multiport fuel injection sys-
tem40
F/ P M P 15 A Multiport fuel injection system/
sequential multiport fuel injection sys-
tem41
DEICER 25 A Windshield wipers and washer
42
STOP 7. 5 A Vehicle Proximity Notification System,
vehicle dynamics integrated manage-
ment, stop lights, multiport fuel injec-
tion system/sequential multiport fuel
injection system, shift lock control sys-
tem, starter system, cruise control43
TOW I N G BAT T 20 A44
TOW I N G 30 A Trailer lights45
FILTER 10 A
46
IG1 MAIN 30 A ECU-IG1 NO. 6, BK/UP LP, ECU-
IG1 NO. 5, ECU-IG1 NO. 4
47
H-LP RH HI 15 A Right-hand headlight (high beam)
48
H-LP LH HI 15 A Left-hand headlight (high beam)Fuse Ampere Circuit

7024-3. Do-it-yourself maintenance
22
TA I L 10 A Parking lights, front side marker lights,
tail lights, license pl ate lights, front fog
lights, towing converter23
AIR SUS 20 A24
P-S E AT R H 30 A Power seat (right-side)25
OBD 7. 5 A On-board diagnosis26
FR DOOR 25 A Front power window (right-side), out-
side rear view mirror27
RR DOOR 25 A Rear power window (right-side)28
FL DOOR 25 A Front power window (left-side), out-
side rear view mirror29
RL DOOR 25 A Rear power window (left-side)30
FR WASH 25 A Windshield wipers and washer31
RR WIP 15 A Windshield wipers and washer32
RR WASH 20 A Windshield wipers and washer33
FR WIP 30 A Windshield wipers and washer
34
ECU IG2 10 A Multiport fuel injection system/
sequential multiport fuel injection sys-
tem, front passenger occupant classi-
fication system, SRS airbag system,
stop lights, electronically controlled
brake system, steering lock system,
hybrid system35
GAUGE NO. 2 7. 5 A Gauge and meters36
RH S-HTR 15 A Seat heater (right-side)
37
LH S-HTR 15 A Seat heater (left-side)Fuse Ampere Circuit

When trouble arises
5
7235-1. Essential information
Emergency flashers............... 724
If your vehicle needs to be
towed ...................................... 725
If you think something is
wrong ...................................... 732 5-2. Steps to take in an
emergency
If a warning light turns on
or a warning buzzer
sounds... ................................. 733
If a warning message is
displayed................................. 743
If you have a flat tire................ 764
If the hybrid system will
not start ................................... 777
If the shift lever cannot be
shifted from P ........................ 779
If you lose your keys .............. 780
If the electronic key does
not operate properly........... 781
If the vehicle 12-volt
battery is discharged ......... 784
If your vehicle overheats ..... 788
If the vehicle becomes
stuck........................................ 793
If your vehicle has to
be stopped in an
emergency ............................ 795