2007 Lexus IS250 horn

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2-4. Using other driving systems
■Sensor detection information
●Certain vehicle conditions and the surrounding environment may affect the
ability of the sensor to correctly detect obstacles. Particular instances where this
may occur are listed below.
• There is dirt, snow or ice on the sensor.
• The sensor is frozen.
•The sensor is covered in any way.
• The vehicle is leaning considerably to one side.
• On an extremely bumpy road, on an incline, on gravel, or on grass.
• The vicinity of the vehicle is noisy due to vehicle horns, motorcycle engines,
air brakes of large vehicles, or other loud noises producing ultrasonic waves.
• There is another vehicle equipped with parking assist sensors in the vicinity.
• The sensor is coated with a sheet of spray or heavy rain
• The vehicle is equipped with a fender pole or wireless antenna.
• Towing eyelets are installed.
• The bumper or sensor receives a strong impact.
• The vehicle is approaching a tall or curved curb.
• In harsh sunlight or intense cold weather
In addition to the examples above, there are instances in which, because of their
shapes, signs and other objects may be judged by the sensor to be closer than they
are.
●The shape of the obstacle may prevent the sensor from detecting it. Pay particu-
lar attention to the following obstacles.
• Wires, fences, ropes etc.
• Cotton, snow and other materials that absorb radio waves
• Sharply-angled objects
• Low obstacles
• Tall obstacles with upper sections projecting outwards in the direction of your
vehicle
■When the display flashes and a message is displayed
P. 3 4 4
■Certification (Canada only)
This ISM device compiles with Canadian ICES-001.
■Customization
Settings (e.g. buzzer volume) can be changed. (P. 406)

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4-3. Do-it-yourself maintenance
Fuse layout and amperage ratings
■Engine compartment (type A)
FuseAmpereCircuit
1ABS NO.325AVDIM
2PWR HTR25A
3TURN-HAZ15AEmergency flashers, turn signals
4IG2 MAIN20AIG2, IGN, GAUGE
5RAD NO.230AAudio
6D/C CUT20ADOME, MPX-B
7RAD NO.130AAudio
8MPX-B10A
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, security sys-
tem
9DOME10AInterior lights, meter

311
4-3. Do-it-yourself maintenance
4
Maintenance and care
■Engine compartment (type B)
FuseAmpereCircuit
1FR CTRL-B25AHeadlight high beam, horn
2A/F15AExhaust system
3ETCS10A
Multiport fuel injection system/
sequential multiport fuel injection sys-
tem
4ALT-S7. 5 ACharging system
5STR LOCK25ASteering lock
6H-LP CLN30AHeadlight cleaner
7A/C COMP7. 5 AAir conditioning system
8DEICER25A
9FR CTRL-AM30AFront fog lights, parking lights, wind-
shield washer
10IG210AIgnition system
11EFI NO.210AFuel system, exhaust system
12H-LP R LWR15AHeadlight low beam (right)
13H-LP L LWR15AHeadlight low beam (left)

312
4-3. Do-it-yourself maintenance
FuseAmpereCircuit
14F/ P M P25AFuel system
15EFI25A
Multiport fuel injection system/
sequential multiport fuel injection sys-
tem
16INJ20A
Multiport fuel injection system/
sequential multiport fuel injection sys-
tem
17H-LP UPR15AHeadlight high beams
18HORN10AHorns
19WA S H E R20AWindshield washer
20FR TAIL10AParking lights
21FR FOG15AFront fog lights

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5-2. Steps to take in an emergency
If the engine will not start
If the engine will not start, even though correct starting procedures are
being followed (
P. 98), 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. 9 8 )
●There may be a malfunction in the engine immobilizer system.
(P. 54)
■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. 3 7 2 )
●The battery terminal connections may be loose or corroded.
■The starter motor does not turn over, 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. 3 7 2 )
●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.

425
What to do if...
What to do if...
A tire puncturesP. 3 5 8If you have a flat tire
The engine does not start
P. 3 6 6If the engine will not start
P. 5 4Engine immobilizer system
P. 3 6 9If the battery is discharged
The shift lever cannot be
moved outP. 3 6 7If the shift lever cannot be shifted
from P
The engine coolant temperature
gauge enters the red zone
Steam can be seen coming
from under the hood
P. 3 7 5If your vehicle overheats
The key is lostP. 3 6 8If you lose your keys
The battery runs outP. 3 7 2If the battery is discharged
The doors cannot be lockedP. 1 9Doors
The horn begins to soundP. 5 6Alarm
The vehicle is stuck in mud or
sandP. 3 7 7If the vehicle becomes stuck