Page 653 of 830
652
4-3. Do-it-yourself maintenance
GX460_CANADA (OM60F29U)
51ECU-B10 A
BODY ECU, meter, heater, steering
sensor, wireless remote control, seat
position memory, tilt and telescopic
steering, multi display, Smart access
system with push button start, folding
seat, cool box, DSS#2 ECU, steering
switch, D-module switch, overhead
module
52WSH FR NO.27. 5 ADSS#1 ECU
53H-LP RH-LO15 AHeadlight low beam (right), headlight
leveling system
54H-LP LH-LO15 AHeadlight low beam (left), headlight
leveling system
55INJ10 ACoil, injector, ignition, noise filter
56EFI NO.210 A
O2 SSR, AFM, ACIS VSV, AI
COMB, KEY OFF PUMP, EYP VSV,
EGR VALVE, CANISTER VSV, AI
VSV RLY, AI PUMP HTR RLY
57WIP FR NO.27. 5 ADSS#1 ECU
58WSH RR15 ARear window washer
59SPARESpare fuse
60SPARESpare fuse
61SPARESpare fuse
FuseAmpereCircuit
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Page 654 of 830
653
4-3. Do-it-yourself maintenance
4
Maintenance and care
GX460_CANADA (OM60F29U)Under the instrument panel
FuseAmpereCircuit
1P/O U T L E T15 APo w e r o u t l e t
2ACC7. 5 A
Outside rear view mirror motor,
BODY ECU, air conditioning system,
audio system, navigation system,
parking assist system, back up relay,
DSS#2 ECU, AT indicator, EFI ECU,
shift lock ECU, DCM, MAYDAY
ECU
3BKUP LP10 A
Back-up lights, audio system, multi
information display, DSS#2 ECU,
parking assist sensor
4TOW I N G B K L P10 ATo w i n g
5AV S20 AAir suspension system
6KDSS10 AKDSS ECU
GX460_CANADA.book Page 653 Thursday, February 4, 2010 11:54 AM
Page 655 of 830
654
4-3. Do-it-yourself maintenance
GX460_CANADA (OM60F29U)
74WD20 A4WD system, rear differential lock
8P/ S E AT F L30 AFront power seat (left)
9D/ L N O. 225 ADoor lock motor, glass hatch
opener, BODY ECU
10PSB30 APSB ECU
11TI & TE15 ATilt and telescopic steering
12FOG FR15 AFront fog lights
13OBD7. 5 ADLC 3
14A/C7. 5 AAir conditioning system
15AM17. 5 AStarting system
16DOOR RL25 ARear power window (left)
17ECU-IG NO.110 A
Shift lock ECU, VSC ECU, steering
sensor, yaw rate sensor, sequential
switch, auto wiper ECU, back up
relay, tilt & telescopic steering, PSB
ECU, DSS#1 ECU, front radar sensor,
AFS ECU, TIRE PRESS ECU,
DRIVER MON ECU
18IG17. 5 A
Front turn signal light, rear turn signal
light, side turn signal light, meter turn
signal light, trailer light, ALT, VSC, C/
C switch
FuseAmpereCircuit
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Page 656 of 830

655
4-3. Do-it-yourself maintenance
4
Maintenance and care
GX460_CANADA (OM60F29U)
19ECU-IG NO.210 A
Rear window defogger, outside rear
view mirror memory, seat heater/ ven-
tilator switch, inverter relay, air condi-
tioning system, EC mirror, BODY
ECU, exhaust gas sensor, parking
assist sensor, navigation system,
DSS#2 ECU, meter switch, accessory
meter, folding seat ECU, O/H IG,
head light cleaner, rear air condition-
ing system, deicer, D-module, rain
sensor, air suspension, RR VLV ECU,
steering heater, LKA, P/SEAT IND
20S/HTR FR20 ASeat heater and ventilator
21P/ S E AT F R30 AFront power seat (right)
22DOOR P30 A
Front power window (passenger’s
side), outside rear view mirror mem-
ory
23DOOR10 APo w e r w i n d o w
24DOOR D25 AFront power window (driver’s side)
25DOOR RR25 ARear power window (right)
26S/ROOF25 AMoon roof
27WIP30 AWindshield wipers and washer
28WA S H E R20 AWindshield wipers and washer, rear
window wipers and washer
29COOLING10 ACool box
FuseAmpereCircuit
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Page 657 of 830
656
4-3. Do-it-yourself maintenance
GX460_CANADA (OM60F29U)
30IGN10 A
EFI ECU, C/OPN RLY, VSC ECU, air
bag ECU, smart entry & start system,
steering lock ECU, CAN gateway
ECU
31GAUGE7. 5 AMeter
32PA N E L7. 5 A
Switch illumination, glove box light,
navigation system, audio system, air
conditioning system, outside rear view
mirror switch, folding seat switch,
multi-information display, P/SEAT
IND, SHIFT, COOL BOX
33TA I L10 A
Front position lights, tail lights, license
plate lights, EFI ECU, rear fog lights,
towing, front fog lights
FuseAmpereCircuit
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657
4-3. Do-it-yourself maintenance
4
Maintenance and care
GX460_CANADA (OM60F29U)
■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. 660)
●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 before the entire wiring harness is damaged.
CAUTION
■To prevent system breakdowns and vehicle fire
Observe the following precautions.
Failure to do so may cause damage, and possibly a fire or injury.
●Never use a fuse of a higher amperage rating than 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.
This can cause extensive damage or even fire.
●Do not modify fuses or the fuse box.
NOTICE
■Before replacing fuses
Have the cause of electrical overload determined and repaired by your Lexus
dealer as soon as possible.
GX460_CANADA.book Page 657 Thursday, February 4, 2010 11:54 AM
Page 735 of 830

734
5-2. Steps to take in an emergency
GX460_CANADA (OM60F29U)
If the engine will not start
If the engine will not start even though correct starting procedures are
being followed (
→P. 179), consider each of the following points:
■The engine will not start even when the starter motor operates
normally
One of the following may be the cause of the problem:
●There may not be sufficient fuel in the vehicle’s tank.
Refuel the vehicle.
● The engine may be flooded.
Try to restart the engine once more following correct starting
procedures. ( →P. 1 7 9 )
● There may be a malfunction in the engine immobilizer system.
(→ P. 1 1 4 )
■ The starter motor turns over slowly, interior lights and headlights
are dim, or the horn does not sound or sounds at a low volume
One of the following may be the cause of the problem:
● The battery may be discharged. ( →P. 74 1 )
● The battery terminal connections may be loose or corroded.
■ The starter motor does not turn over
The engine starting system may be malfunctioning due to an electri-
cal problem such as an open circuit or a blown fuse. However, an
interim measure is available to start the engine. ( →P. 7 3 8 )
GX460_CANADA.book Page 734 Thursday, February 4, 2010 11:54 AM
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815
Alphabetical index
GX460_CANADA (OM60F29U)
Emergency flashersSwitch ...................................................... 674
Engine Accessory mode ................................. 179
Compartment .................................... 608
Engine switch ........................................ 179
Hood ....................................................... 607
How to start the engine.................... 179
Identification number....................... 753
If the engine will not start ................734
Ignition switch........................................ 179
Overheating..........................................744
Engine compartment cover............. 609
Engine coolant Capacity..................................................757
Checking .................................................615
Preparing and checking before winter...................................... 361
Engine coolant temperature gauge ....................................................... 195
Engine immobilizer system ..................114
Engine oil Capacity................................................. 755
Checking .................................................610
Preparing and checking before winter...................................... 361
Engine oil maintenance data ............. 612
Engine switch ........................................... 179
Engine switch light .................................. 511
Event data recorder ............................ 683 Floor mats ................................................556
Fluid
Brake ......................................................... 618
Power steering ................................... 620
Washer ...................................................626
Fog lights
Replacing light bulbs ....................... 664
Switch....................................................... 233
Wattage.................................................. 763
Footwell light .............................................511
Four-wheel drive system .....................317
Front passenger occupant
classification system .......................... 140
Front passenger’s seat belt
reminder light......................................690
Front seats
Adjustment ............................................... 64
Driving position memory .................. 79
Front side marker light Replacing light bulbs ....................... 665
Wattage.................................................. 763
Front turn signal lights
Replacing light bulbs ....................... 666
Switch.........................................................192
Wattage.................................................. 763
Fuel
Capacity ................................................. 754
Fuel gauge.............................................. 195
Fuel pump shut off system............ 682
Gas station information ................. 828
Information ............................................ 764
Refueling.................................................. 109
Fuel door ................................................... 109
Fuel filler door ......................................... 109
Fuel pump shut off system .................682
Fuses .......................................................... 645F
GX460_CANADA.book Page 815 Thursday, February 4, 2010 11:54 AM