Page 428 of 578
427
4-3. Do-it-yourself maintenance
4
Maintenance and care
IS350/250_U
Fuse layout and amperage ratings■ Engine compartment (type A fuse box)
FuseAmpereCircuit
1PWR HTR25 A
2TURN-HAZ15 AEmergency flashers, turn signals
3IG2 MAIN20 AIG2, IGN, GAUGE
4RAD NO.230 AAudio
5D/C CUT20 ADOME, MPX-B
6RAD NO.130 A
7MPX-B10 A
Headlights, front fog lights, parking
lights, license plate lights, windshield
washer, horn, power door lock system,
power windows, power seats, electric
tilt and telescopic steering column,
meter, smart access system with push-
button start, outside rear view mirrors,
air conditioning system, multiplex
communication system
8DOME10 AInterior lights, meter, outer foot lights
9CDS10 AElectric cooling fans
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5
When trouble arises
489
5-2. Steps to take in an emergency
IS350/250_U
If the engine will not start
If the engine will not start even though correct starting procedures are
being followed (
→P. 134), 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 3 4 )
● There may be a malfunction in the engine immobilizer system.
(→ P. 8 5 )
■ The starter motor turns over slowly, the interior lights and head-
lights are dim, or the horn does not sound or sounds at a low vol-
ume.
One of the following may be the cause of the problem.
● The battery may be discharged. ( →P. 4 9 8 )
● The battery terminal connections may be loose or corroded.
■ The starter motor does not turn ov er, the interior lights and head-
lights do not turn on, or the horn does not sound.
One of the following may be the cause of the problem.
● One or both of the battery terminals may be disconnected.
● The battery may be discharged. ( →P. 4 9 8 )
● There may be a malfunction in the steering lock system.
Contact your Lexus dealer if the problem cannot be repaired, or if
repair procedures are unknown.
Page 525 of 578
524
6-1. Specifications
IS350/250_U
Light bulbs
A: D4S discharge bulbs
B: H11 halogen bulbs
C: Wedge base bulbs (amber)
D: HB3 halogen bulbs
E: Wedge base bulbs (clear)
F: Double end bulbs
Light BulbsBulb No.WTy p e
Exterior
Headlights
High beam
Low/high beam (discharge bulbs)
Low beam (halogen bulbs)
9005D4S
H116035
55D
A B
Front turn signal lights21C
Parking lights (vehicles with
halogen headlights)1685E
Front fog lightsH1155B
Rear turn signal lights744021E
Back-up lights92116E
Outer foot lights5E
Interior
Vanity lights8E
Tr u n k l i g h t5F
Interior lights Front
Rear
5
3E
F
Overhead courtesy lights3F
Front door courtesy lights5E
Page 569 of 578

568
Alphabetical index
IS350/250_U
Hands-free system for mobile phone ...............................284
Hazard lights Switch ......................................................450
Head restraints Adjusting .................................................. 57
Headlight aim .........................................438
Headlight cleaner ...................................174
Headlights Discharge headlight
precautions ....................................... 447
Replacing light bulbs........................ 439
Switch ....................................................... 165
Wattage.................................................. 524
Heaters Seat heaters............................. 335, 338
Side mirror .............................................. 214
Hill-start assist control ......................... 185
Hood ......................................................... 383
Hooks
Cargo ...................................................... 347
Coat ......................................................... 345
Shopping bag...................................... 347
Horn ............................................................ 150
I/M test ...................................................... 379
Identification Engine .................................................... 509
Vehicle ................................................... 509
Ignition switch.......................................... 134
Illuminated entry system ..................... 315
Indicator lights......................................... 157
Initialization Items to initialize ................................. 546 Inside rear view mirror .......................... 70
Interior lights
Interior lights .......................................... 315
Switch........................................................ 317
Wattage ................................................. 524
Jack Positioning a floor jack ................... 384
Vehicle-equipped jack..................... 481
Jack handle .............................................. 481
Keyless entry ............................................. 40
Keys Electronic key ......................................... 24
Engine switch ........................................ 134
If you lose your keys .........................492
If the electronic key does not operate properly............................ 493
Key number.............................................. 24
Keyless entry........................................... 40
Keys.............................................................. 24
Mechanical key ......................................25
Wireless remote control key.......... 40H
I
J
K
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569
Alphabetical index
IS350/250_U
Light bulbsReplacing............................................... 439
Wattage ................................................. 524
Lights
Door courtesy lights ..........................315
Emergency flasher switch ............. 450
Fog light switch.....................................168
Hazard light switch...........................450
Headlights switch ................................165
Interior light switch.............................. 317
Outer foot lights...................................315
Overhead courtesy light ................. 315
Personal light switch .......................... 317
Replacing light bulbs ....................... 439
Scuff lights ............................................... 315
Shift lever light .......................................315
Turn signal lever................................... 147
Vanity lights ...........................................327
Wattage ................................................. 524
Load capacity .......................................... 194
Maintenance
Do-it-yourself maintenance .........380
General maintenance ..................... 376
Maintenance data ............................ 508
Maintenance requirements ...........374
Manual transmission............................. 145
Meter Instrument panel light control ....... 152
Meters .........................................................151
Micro dust and pollen filter ................ 210 Mirrors
Inside rear view mirror ....................... 70
Side mirror heater ...............................214
Side mirrors ............................................. 72
Vanity mirrors ...................................... 327
Moon roof................................................... 78
MP3 disc .................................................. 234
Multi-information display ................... 160
Noise from under vehicle...................... 19
Odometer...................................................151
Oil Engine oil............................................... 389
Opener Fuel filler door ......................................... 82
Hood ....................................................... 383
Trunk ........................................................... 47
Outer foot lights Outer foot lights .................................. 315
Wattage ..................................................524
Outside rear view mirrors
Adjusting and folding.......................... 72
Mirror position memory ....................53
Outside temperature display ............. 161
Overhead console ............................... 322
Overhead courtesy lights Overhead courtesy lights ............... 315
Wattage ..................................................524
Overheating, Engine............................ 501L
M
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