Page 487 of 573

4868-2. Steps to take in an emergency
IS350/250_U (OM53758U)
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 0 )
●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.
When the engine does not start, the following steps can be used as an interim
measure to start the engine if the engine switch is functioning normally:
Set the parking brake.
Shift the shift lever to P.
Turn the engine switch to ACCESSORY mode.
Press and hold the engine switch for about 15 seconds while depressing the
brake pedal firmly.
Even if the engine can be started using the above steps, the system may be mal-
functioning. Have the vehicle inspected by your Lexus dealer.
The starter motor does not turn over, the interior lights and headlights
do not turn on, or the horn does not sound.
Emergency start function
1
2
3
4
Page 510 of 573
5099-1. Specifications
9
Vehicle specifications
IS350/250_U (OM53758U)
Light bulbs*1
Light bulbsBulb No.WTy p e
Exterior
Discharge headlights*235A
Fog lights*219B
Front turn signal lights7444NA28 /8C
Rear turn signal lights21C
Back-up lights92116D
Outer foot lights5D
Interior
Door courtesy lights1685D
Vanity lights8D
Interior light8D
Pe r s o n a l l i g h t s8D
Footwell lights1943.8D
Trunk light5D
A: D4S discharge bulbsB: H16 halogen bulbs
C: Wedge base bulbs (amber) D: Wedge base bulbs (clear)
*1: Light bulbs not listed in this table are LED bulbs.
*2: If equipped
Page 533 of 573
5329-2. Customization
IS350/250_U (OM53758U)
■Illumination ( P. 3 5 6 )
■Seat belt reminder ( P. 4 5 6 )
FunctionDefault settingCustomized setting
Time elapsed before the
interior lights turn off15 seconds
Off
O—O7. 5 s e c o n d s
30 seconds
Operation after the engine
switch is turned offOnOff——O
Operation when the doors
are unlockedOnOff——O
Operation when you
approach the vehicle with
the electronic key on your
person
OnOff——O
Inside door handle lightsOnOff——O
Time elapsed before the
outer foot lights turn off15 seconds
Off
O—O7. 5 s e c o n d s
30 seconds
Operation of the outer foot
lights when you approach
the vehicle with the elec-
tronic key on your person
OnOff——O
Operation of the outer foot
lights when the doors are
unlocked with the power
door lock switch
OnOff——O
123
FunctionDefault settingCustomized setting
Vehicle speed linked seat
belt reminder buzzerOnOff——O
123
Page 555 of 573

554Alphabetical index
IS350/250_U (OM53758U)
Back-up lightsReplacing light bulbs ......................... 441
Wattage ................................................. 509
Battery.......................................................408 Battery checking ............................... 408
If the vehicle battery is discharged.................................... 490
Preparing and checking before winter ....................................................254
Warning light ...................................... 455
Bluetooth
®
Audio system ...................................... 309
Hands-free system (for cellular phone) ........................... 311
Bottle holders ......................................... 360
Brake Fluid...........................................................407
Parking brake......................................... 172
Warning light ...................................... 455
Brake assist ............................................. 234
Break-in tips.............................................. 147
Brightness control Instrument panel light control .........84
BSM (Blind Spot Monitor)................ 246 Care................................................384, 387
Aluminum wheels ..............................384
Exterior ...................................................384
Interior ..................................................... 387
Seat belts............................................... 388
Cargo capacity ....................................... 156
Cargo hooks ...........................................362
CD player.................................................287
Chains ....................................................... 255
Child restraint system ............................54 Booster seats, definition .................... 55
Booster seats, installation ................. 64
Convertible seats, definition ........... 55
Convertible seats, installation........... 61
Front passenger occupant classification system..........................47
Infant seats, definition.......................... 55
Infant seats, installation......................... 61
Installing CRS with LATCH anchors ..................... 59
Installing CRS with seat belts ........... 61
Installing CRS with top tether strap......................... 65
BC
Page 561 of 573

560Alphabetical index
IS350/250_U (OM53758U)
I/M test ..................................................... 396
IdentificationEngine ....................................................... 501
Vehicle ..................................................... 501
Ignition switch (engine switch)......... 159
Illuminated entry system .................... 357
Immobilizer system................................. 69
Indicators .................................................... 78
Initialization Maintenance.......................................... 391
Moon roof ...............................................142
Multi-information display ................. 88
Power windows ................................... 138
Tire pressure warning system..................................412
Initiators (tire pressure warning system).................................. 418
Inside door handle lights ................... 356
Inside rear view mirror .........................132
Instrument panel light control ............ 84
Interior lights........................................... 357 Wattage ................................................. 509
Intuitive parking assist........................... 214
Jack Positioning a floor jack ................... 400
Vehicle-equipped jack ................... 476
Jack handle .................................................. 476
Jam protection function Moon roof ................................................ 141
Power windows ................................... 138 Keyless entry
Smart access system with push-button start.........103, 109
Wireless remote control.......103, 109
Keys .............................................................. 98 Battery-saving function ..................... 115
Electronic key ......................................... 98
Engine switch ........................................159
If the electronic key does not operate properly ....... 488
Key number plate ................................. 98
Keyless entry ........................................... 98
Mechanical key...................................... 99
Replacing the battery .......................427
Warning buzzer...................................104
Wireless remote control................... 98
Knee airbags ..............................................36
I
J
K
Page 562 of 573

561Alphabetical index
IS350/250_U (OM53758U)
Lane Departure Alert (LDA) ..........208
Language (multi-information display) ............... 88
LATCH anchors ...................................... 59
LDA (Lane Departure Alert) ..........208
Lever Auxiliary catch lever ........................ 399
Hood lock release lever ................ 399
Internal trunk release lever................. 111
Shift lever ................................................. 164
Tilt and telescopic steering lock release lever............................. 130
Turn signal lever .................................. 170
Wiper lever ............................................ 182
Lexus Display Audio system ............ 260
Lexus Display Audio controller...... 262
Lexus Enform
*
License plate lights................................. 173 Light switch .............................................173
Replacing light bulbs ........................ 442 Light bulbs
Replacing ............................................... 434
Wattage ................................................ 509
Lights Fog light switch ...................................... 181
Headlight switch .................................. 173
Illuminated entry system................. 357
Interior light........................................... 357
Interior lights list..................................356
Personal lights ..................................... 357
Replacing light bulbs ....................... 434
Trunk light................................................... 111
Turn signal lever ...................................170
Vanity lights ..........................................365
Wattage ................................................ 509
Lock steering column............................ 161
Low profile tire ........................................ 415
Luggage security system ..................... 110
L
*: For vehicles with a navigation system, refer to the “Navigation System Owner’s Manual”.