Page 706 of 890
GS450h_OM_OM30D52U_(U)
7056-3. Do-it-yourself maintenance
6
Maintenance and care
11DOOR FL30Outside rear view mirror defoggers, power
window (front left-hand)
12CAPACITOR
(HV)10Capacitor
13STRG LOCK15Steering lock system
14D/L NO.225Po w e r d o o r l o c k s y s t e m
15DOOR RL30Power window (rear left-hand)
16HAZ15Turn signal lights, emergency flashers
17LH-IG210
Multiport fuel injection system/sequential
multiport fuel injection system, stop lights,
smart access system with push-button start,
steering lock system, brake system, power
management system
18LH J/B-B7. 5Body ECU
19S/ROOF20Moon roof
20P/ S E AT 2 F/ L25Po w e r s e a t s
21TI & TE20Electric tilt and telescopic steering column
22A/C7. 5Air conditioning system
FuseAmpereCircuit
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Page 707 of 890
706
GS450h_OM_OM30D52U_(U)
6-3. Do-it-yourself maintenance
■Passenger’s side instrument panel
FuseAmpereCircuit
1P/ S E AT 1 F/ R30Po w e r s e a t s
2FR P/OUTLET15Po w e r o u t l e t ( f r o n t )
3RR P/OUTLET15Po w e r o u t l e t ( r e a r )
4P/ S E AT 2 F/ R25Po w e r s e a t s
5AV S20AV S
6STRG HTR15Heated steering wheel
7WA S H20Windshield washer
8RH ECU-IG10
Navigation system, pre-collision seat belts,
air conditioning system, brake system, Lexus
night view, yaw rate and G sensor, capacitor
9RH-IG10
Tension reducer, seat heater/ventilator
switches, front right-hand door ECU, CAN
gateway ECU, tire pressure warning system,
power seats
10DOOR FR30
Front right-hand door control system (out-
side rear view mirror defoggers, power win-
dow)
11DOOR RR30Power window (rear right-hand)
12RAD NO.230Audio system
13AM27. 5Po w e r m a n a g e m e n t s y s t e m
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Page 708 of 890
GS450h_OM_OM30D52U_(U)
7076-3. Do-it-yourself maintenance
6
Maintenance and care
14MULTIMEDIA10Navigation system, Remote Touch
15RAD NO.130Audio system
16AIR BAG10SRS airbag system, occupant classification
system
17OBD7. 5On-board diagnosis system
18ACC7. 5
Body ECU, head-up display, RR CTRL, navi-
gation system, hybrid transmission, Remote
Touch, DCM, Remote Touch screen, clock
FuseAmpereCircuit
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Page 709 of 890
708
GS450h_OM_OM30D52U_(U)
6-3. Do-it-yourself maintenance
■Tr u n k
FuseAmpereCircuit
1PSB30Pre-collision seat belts
2PTL25Power trunk opener and closer
3RR J/B-B10Smart access system with push-button start
4RR S/HTR20Seat heaters (rear)
5FR S/HTR10Seat heaters/ventilators (front)
6RR FOG10No circuit
7DC/DC-S (HV)7. 5DC/DC converter
8BATT FAN (HV)20Hybrid battery (traction battery) cooling fan
system
9SECURITY7. 5SECURITY
10ECU-B NO.37. 5Pa r k i n g b r a ke
11TRK OPN7. 5Power trunk opener and closer, trunk open
motor
12DCM (HV)7. 5DCM
13AC INV (HV)20Po w e r o u t l e t ( 1 2 0 V AC )
14RR-IG15Radar sensor, Blind Spot Monitor
15RR ECU-IG10
Power trunk opener and closer, parking
brake, tension reducer (rear left-hand), RR
CTRL SW, tire pressure warning system
16EPS-IG5Electric power steering system
17BACK UP7. 5Back-up lights
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Page 710 of 890
GS450h_OM_OM30D52U_(U)
7096-3. Do-it-yourself maintenance
6
Maintenance and care
■The upper part of the 12-volt battery*
*
: When one or more of the fuses in this unit are blown, the unit needs to be replaced as a whole.
FuseAmpereCircuit
1EPB30Pa r k i n g b r a ke
2LUG-J/B BATT40Luggage compartment junction block
3EPS80Electric power steering
4ARS80No circuit
5MAIN220Engine compartment junction block
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Page 711 of 890

710
GS450h_OM_OM30D52U_(U)
6-3. Do-it-yourself maintenance
■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. 7 1 3 )
●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 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 your Lexus
dealer as soon as possible.
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Page 789 of 890

788
GS450h_OM_OM30D52U_(U)
7-2. 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. 7 9 4 )
●There may not be sufficient fuel in the vehicle’s tank.
Refuel the vehicle.
●There may be a malfunction in the immobilizer system. ( →P. 8 1 )
●There may be a malfunction in the steering lock system.
●The hybrid system may be malfunctioning due to an electrical problem
such as electronic key battery depletion or a blown fuse. However,
depending on the type of malfunction, an interim measure is available
to start the hybrid system. ( →P. 7 8 9 )
One of the following may be the cause of the problem:
●The 12-volt battery may be discharged. ( →P. 7 9 6 )
●The 12-volt battery terminal connections may be loose or corroded.
Reasons for the hybrid system not st arting vary depending on the situa-
tion. Check the following and perform the appropriate procedure:
The hybrid system will not start even though the correct starting
procedure is being followed. ( →P. 1 9 3 )
The interior lights and headlights are dim, or the horn does not
sound or sounds at a low volume.
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Page 874 of 890

873Alphabetical index
GS450h_OM_OM30D52U_(U)
First-aid kit storage net ...................... 607
Flat tire .......................................................775
Floor mats ................................................... 28
FluidBrake ......................................................... 815
Hybrid transmission........................... 814
Washer ................................................... 672
Fog lights .................................................. 222 Replacing light bulbs ..............715, 723
Switch....................................................... 222
Wattage ................................................... 817
Footwell light .......................................... 597
Front passenger occupant classification system ............................ 49
Front personal lights............................598
Front seats ................................................ 150 Adjustment ............................................. 150
Cleaning ................................................ 646
Correct driving posture ....................30
Driving position memory ................ 152
Head restraints..................................... 158
Power easy access system ............ 152
Seat heaters ........................................... 616
Seat position memory....................... 152
Seat ventilators ..................................... 616
Front side marker lights ....................... 217 Light switch ............................................. 217
Replacing light bulbs ........................ 723
Welcome light illumination
control ....................................................123
Front turn signal lights ........................ 209
Replacing light bulbs .......................... 717
Turn signal lever ................................ 209
Wattage ................................................... 817 Fuel.............................................................. 810
Capacity .................................................. 810
Fuel gauge ................................................. 91
Information............................................. 818
Refueling .................................................. 231
Type................................................. 231, 810
Warning light ....................................... 740
Warning messages .......................... 763
Fuel consumption Average fuel consumption .............. 98
Average fuel consumption after refueling .......................................97
Current fuel consumption.................97
Fuel filler door.......................................... 231
Refueling .................................................. 231
When the fuel filler door cannot be opened ......................... 234
Fuses.......................................................... 696
Garage door opener........................... 627
Gauges.......................................................... 91
Glove box ............................................... 602
Glove box light...................................... 602
F
G
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