Page 445 of 600
445
ES300h_OM_OM33B71U_(U)7-3. Do-it-yourself maintenance
7
Maintenance and care
Engine compartment
■12-volt battery
P. 4 5 5
Wa s h e r f l u i d t a n k ( P. 4 5 4 )
Fuse boxes ( P. 4 7 7 )
Power control unit coolant
reservoir ( P. 4 5 1 )
Engine oil level dipstick (P. 4 4 7 )
Engine oil filler cap ( P. 4 4 8 )Engine coolant reservoir
(P. 4 5 1 )
Brake fluid reservoir ( P. 4 5 3 )
Power control unit coolant
radiator ( P. 4 5 2 )
Electric cooling fans
Condenser ( P. 4 5 2 )
Engine coolant radiator (P. 4 5 2 )1
2
3
4
5
6
7
8
9
10
11
Page 477 of 600
477
ES300h_OM_OM33B71U_(U)7-3. Do-it-yourself maintenance
7
Maintenance and care
Checking and replacing fuses
Turn the power switch off.
Open the Fuse box cover.
If any of the electrical components do not operate, a fuse may have blown. If
this happens, check and replace the fuses as necessary.
1
2
Engine compartment (right side)Engine compartment (left side)
Push the tab in and lift the lid off. Push the tab in and lift the lid off.
Driver’s side instrument panel
Remove the lid.
Page 478 of 600
478
ES300h_OM_OM33B71U_(U)7-3. Do-it-yourself maintenance
Remove the fuse with the pullout
tool.
Only type A fuse can be removed using
the pullout tool.
Check if the fuse is blown.
Normal fuse
Blown fuse
Type A and B:
Replace the blown fuse with a new fuse of an appropriate amperage rating. The
amperage rating can be found on the fuse box lid.
Ty p e C :
Contact your Lexus dealer.
3
4
1
2
Ty p e ATy p e B
Ty p e C
Page 479 of 600

ES300h_OM_OM33B71U_(U)
4797-3. Do-it-yourself maintenance
7
Maintenance and care
■After a fuse is replaced
●If the lights do not turn on even after the fuse has been replaced, a bulb may need
replacement. (P. 4 8 0 )
●If the replaced fuse blows again, have the vehicle inspected by your Lexus dealer.
■If there is an overload in a circuit
The fuses are designed to blow, protecting the wiring harness from damage.
■When replacing light bulbs
Lexus recommends that you use genuine Le xus products designed for this vehicle.
Because certain bulbs are connected to circuits designed to prevent overload, non-gen-
uine parts or parts not designed for this vehicle may be unusable.
WA R N I N G
■To prevent system breakdowns and vehicle fire
Observe the following precautions.
Failure to do so may cause damage to the vehicle, and possibly a fire or injury.
●Never use a fuse of a higher amperage rati ng than that indicated, or use any other
object in place of a fuse.
●Always use a genuine Lexus fuse or equivalent.
Never replace a fuse with a wire, even as a temporary fix.
●Do not modify the fuses or fuse boxes.
NOTICE
■Before replacing fuses
Have the cause of electrical overload determ ined and repaired by your Lexus dealer as
soon as possible.
Page 518 of 600

518
ES300h_OM_OM33B71U_(U)8-2. Steps to take in an emergency
If the hybrid system will not start
One of the following may be the cause of the problem:
●The electronic key may not be functioning properly. (
P. 522)
●There may not be sufficient fuel in the vehicle’s tank.
Refuel the vehicle.
●There may be a malfunction in the immobilizer system. ( P. 76 )
●There may be a malfunction in the steering lock system.
●The hybrid system may be malfunctioni ng due to an electrical problem such
as electronic key battery depletion or a blown fuse. However, depending on
the type of malfunction, an interim meas ure is available to start the hybrid sys-
tem. ( P. 5 1 9 )
One of the following may be the cause of the problem:
●The 12-volt battery may be discharged. ( P. 5 2 3 )
●The 12-volt battery terminal connections may be loose or corroded.
( P. 4 5 5 )
One of the following may be the cause of the problem:
●The 12-volt battery may be discharged. ( P. 5 2 3 )
●One or both of the 12-volt battery terminals may be disconnected. ( P. 4 5 5 )
Contact your Lexus dealer if the problem cannot be repaired, or if repair procedures
are unknown.
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 ev en though the correct starting proce-
dure is being followed. ( P. 166)
The interior lights and headlights are dim, or the horn does not sound or
sounds at a low volume.
The interior lights and headlights do not turn on, or the horn does not
sound.
Page 587 of 600

587Alphabetical index
ES300h_OM_OM33B71U_(U)
Enhanced VSC ......................................272
EPS (Electronic Po wer Steering)
Function .................................................. 273
Warning light ...................................... 500
Event data recorder (EDR) .................... 11
Flat tire ......................................................508
Floor mats ................................................... 28
Fluid Brake ....................................................... 540
Hybrid transmission......................... 540
Washer ...................................................454
Fog lights Switch........................................................ 185
Footwell light .......................................... 396
Front passenger occupant classification system ............................ 46
Front personal lights............................ 397
Front seats Adjustment ............................................. 129
Cleaning .................................................. 431
Correct driving posture ....................30
Driving position memory ................ 130
Head restraints ..................................... 135
Power easy access system ............ 130
Seat heaters ......................................... 395
Seat position memory....................... 130
Seat ventilators ................................... 395 Front side marker lights
Light switch.............................................178
Replacing light bulbs .......................486
Wattage ................................................. 542
Front turn signal lights Replacing light bulbs ....................... 484
Turn signal lever ................................... 176
Wattage ................................................. 542
Fuel Capacity.................................................536
Fuel gauge ............................................... 86
Information............................................ 543
Refueling ................................................. 190
Type..........................................................536
Warning light ...................................... 500
Fuel filler door..........................................190 Refueling ................................................. 190
When the fuel filler door cannot be opened ........................... 192
Fuses........................................................... 477
Garage door opener..............................411
Gauges........................................................ 86
Glove box ............................................... 400
Grocery bag hooks............................. 403
F
G
Page 593 of 600

593Alphabetical index
ES300h_OM_OM33B71U_(U)
Rear turn signal lightsReplacing light bulbs ........................487
Turn signal lever ...................................176
Wattage ..................................................542
Rear view mirror Inside rear view mirror ..................... 140
Outside rear view mirrors ...............142
Rear window defoggers ....................388
Refueling ................................................... 190 Capacity ................................................ 536
Fuel types .............................................. 536
Opening the fuel tank cap.............. 192
When the fuel filler door cannot be opened .......................... 192
Regenerative braking ............................ 69
Remote Touch
*
Replacing Electronic key battery ......................475
Fuses......................................................... 477
Light bulbs ............................................ 480
Tires ......................................................... 508
Reporting safety defects for U.S. owners................................... 568
Resetting the message indicating maintenance is required ................ 435
Road accident cautions .........................74 Safety Connect ......................................422
Seat belts
Adjusting the seat belt.........................32
Automatic Locking Retractor ........ 33
Child restraint system installation ............................................. 60
Cleaning and maintaining the seat belt ....................................... 432
Emergency Locking Retractor................................................ 33
How to wear your seat belt..............32
How your child should wear the seat belt .......................................... 33
Pregnant women, proper seat belt use ......................................... 34
Reminder light and buzzer .......... 500
Seat belt extender ................................ 34
Seat belt pretensioners...................... 33
SRS warning light .............................. 499
Seat heaters............................................ 395
Seat position memory ..........................130
Seat ventilators...................................... 395
Seating capacity ..................................... 163
S
*: For vehicles with navigation system, refer to the
“NAVIGATION SYSTEM OWNER’S MANUAL”.