Page 762 of 1014
7386-3. Do-it-yourself maintenance
GS450h_300h_OM_OM30D53E_(EE)
Engine compartment
GS300h
12-volt battery
P. 7 4 9
Power control unit coolant
reservoir (P. 745)
Engine oil level dipstick
(P. 741)
Engine oil filler cap (P.
742)
Engine coolant reservoir
(P. 744)Fuse box (P. 782)
Washer fluid tank (P. 748)
Electric cooling fans
Condenser (P. 747)
Radiator (P. 747)1
2
3
4
5
6
7
8
9
Page 763 of 1014
739 6-3. Do-it-yourself maintenance
6
Maintenance and care
GS450h_300h_OM_OM30D53E_(EE)
GS450h
12-volt battery
P. 7 4 9
Engine oil level dipstick
(P. 741)
Engine coolant reservoir
(P. 744)
Engine oil filler cap (P.
742)
Power control unit coolant
reservoir (P. 745)Fuse box (P. 782)
Washer fluid tank (P. 748)
Electric cooling fans
Condenser (P. 747)
Radiator (P. 747)1
2
3
4
5
6
7
8
9
Page 806 of 1014
7826-3. Do-it-yourself maintenance
GS450h_300h_OM_OM30D53E_(EE)
Checking and replacing fuses
Turn the power switch off.
After a system failure, see “Fuse layout and amperage ratings”
for details about which fuse to check. (P. 787)
Open the fuse box cover.
Engine compartment:
Remove the engine compart-
ment cover (P. 740) and
remove all of the clips.
Push the tabs on either side to
detach the lock and lift the lid
off while pulling the lock
plate.
When installing the lid, check
that the lock plate and the tabs
on either side are connected cor-
rectly.
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
3
Page 810 of 1014
7866-3. Do-it-yourself maintenance
GS450h_300h_OM_OM30D53E_(EE)
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 a n d D :
Contact any authorized Lexus dealer or repairer, or another duly qualified
and equipped professional.
5
1
2
Type AType B
Type CType D
Page 826 of 1014

8026-3. Do-it-yourself maintenance
GS450h_300h_OM_OM30D53E_(EE)
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. 803)
If the replaced fuse blows again, have the vehicle inspected by any autho-
rized Lexus dealer or repairer, or another duly qualified and equipped pro-
fessional.
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 Lexus products designed for this
vehicle. Because certain bulbs are connected to circuits designed to prevent
overload, non-genuine parts or parts not designed for this vehicle may be
unusable.
CAUTION
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 rating 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 determined and repaired by any
authorized Lexus dealer or repairer, or another duly qualified and equipped
professional as soon as possible.
Page 1001 of 1014

969Alphabetical index
GS450h_300h_OM_OM30D53E_(EE)
Front seats .................................194
Adjustment ...........................194
Cleaning................................724
Correct driving posture ...........36
Driving position memory .....199
Head restraints ......................206
Power easy access system ....199
Seat heaters ...........................704
Seat position memory ...........199
Seat ventilators .....................704
Front turn signal lights ..............267
Replacing light bulbs ............807
Turn signal lever ...................267
Wattage .................................940
Fuel ............................................293
Capacity ................................929
Fuel gauge ............................109
Information ...........................941
Refueling ..............................293
Type ..............................293, 929
Warning light........................834
Warning messages ................857
Fuel consumption
Average fuel consumption....116
Average fuel consumption
after refueling .....................115
Current fuel consumption .....115
Fuel filler door...........................293
Refueling ..............................293
When the fuel filler door
cannot be opened................296
Fuses ..........................................782Gauges ...................................... 109
Glove box ................................. 689
Glove box light ......................... 689
Grille Shutter system
Warning message................. 847
Hands-free system
(for cellular phone) ................ 611
Head restraints .......................... 206
Headlight cleaner...................... 293
Headlights................................. 272
Adaptive Front-lighting
System (AFS) .................... 274
Automatic High Beam
system................................ 277
Discharge headlights
precautions ........................ 820
Follow me home system ...... 273
Headlight leveling warning
message ............................. 843
Light switch ......................... 272
Replacing light bulbs ........... 818
Wattage ................................ 940
Head-up display........................ 122
Heaters ...................................... 478
Air conditioning system....... 478
Heated steering wheel.......... 702
Outside rear view mirrors .... 501
Seat heaters .......................... 704
High-voltage components........... 84G
H