horn Lexus GS450h 2007 Do-it-yourself maintenance / LEXUS 2007 GS450H THROUGH JUNE 2006 PROD. OWNER'S MANUAL (OM30727U)

64
1-7. Anti-theft system
Alarm
Deactivating or stopping the alarm
Do one of the following:
●Unlock the doors or trunk using the smar
t access system with push-
button start or the wireless remote control.
● St
art the hybrid system. (The alarm wi ll be deactivated or stopped after
a few seconds.)
■Items to check before locking the vehicle
To prevent unintended triggering of the alar m
, check that there is no one in the vehi-
cle, and that all windows and moon roof ar
e closed before locking the vehicle.
The alarm warns of forcible entry using the horn and lights.
To arm the alarm, exit the vehi-
cle, make sure that the doors,
trunk and hood ar
e closed, and
lock all the doors. 
The system will operate auto -
matically once the indicator
changes fr
om lit to flashing.

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2-4. Using other driving systems
2
When driving
●In the following situations, the intuitive parking assist may not function correctly,
possibly leading to an accident.
• There is ice, snow or mud on the sensors. (Wiping the sensors will resolve this problem.)
• The sensor area is frozen. (Thawing the area will resolve this problem.) 
In especially cold weather, if a sensor is frozen the screen may show an abnor-
mal display, or obstacles may not be detected.
• The vehicle angle is especially wide.
• In harsh sunlight or intense cold weather.
• When driving on bumpy, sloped or gravel roads, or over grass.
• If there is something producing ultrasonic waves nearby, such as another vehicle’s horn, motorcycle engine nois e, air braking sound from heavy-duty
vehicles, or another vehicle using the intuitive parking assist.
• In heavy rain, or if water is splashed on the sensors.
• If a commercial fender pole or radio antenna is installed.
• If towing eyelet is installed on your vehicle.
• If moving towards a high curb or a curb corner.
• Objects such as signs may cause the detection distance to shorten.
• The area directly under the bumpers is not detected. 
Objects lower than the sensor s or thin stakes etc. may be detected initially,
but as they draw closer, they may cease to be detected.
• If obstacles draw too close to the sensor.
■Obstacles that may not be detected correctly
The following obstacles may not be detected.
• Thin objects such as wire, fencing or rope.
• Objects that absorb sound waves, such as cotton or snow.
• Objects with sharp corners.
• Objects where the upper section projects out over the lower section.
•Low objects.

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4-3. Do-it-yourself maintenance
Fuse layout and amperage ratings
■Engine compartment
FuseAmpereCircuit
1FR CTRL-B25H-LP HI, HORN
2RELIEF VLV10Fuel system
3ETCS10
Multiport fuel injection system/
sequential multiport fuel injection
system
4H-LP CLN30Headlight cleaner
5STB-AM30Active stabilizer suspension system
6DEICER25
7FR CTRL-AM30FR TAIL, FR FOG, WASH

402
4-3. Do-it-yourself maintenance
FuseAmpereCircuit
23A/F15Fuel system
24INV W/P10Hybrid system
25IGCT No.120Hybrid system, IGCT No.2, 
IGCT No.3
26FR FOG15Fog light
27FR TAIL10Tail light, rear side marker light
28WA S H20Windshield washer
29HORN10Horn
30H-LP HI20Headlight high beam
31DC/DC140Charging system
32RAD FAN60Electric cooling fans
33LH J/B AM80
S/ROOF, FR P/SEAT LH, TV, A/C,
FUEL OPN, FR WIP, H-LP LVL, 
FR S/HTR LH, A/C W/P
34E/G AM60H-LP CLN, FR CTRL-AM, DEICER,
STB AM
35HEATER50Air conditioning system
36DEFOG50Rear window defogger
37ABS230VSC, ABS
38RH J/B-AM80
AM1, OBD, STOP SW, TI & TE, 
FR P/SEAT RH, STR LOCK, 
SECURITY, ECU-IG R, RH-IG, 
F S/HTR RH, CIG, PWR OUTLET, 
AIR SUS

466
5-2. Steps to take in an emergency
If the hybrid system will not start
If the hybrid system will not start even though correct starting procedures
are being followed (
P. 1 0 1), consider each of the following points.
■The hybrid system will not start ev en if you are carrying the cor-
rect electronic key
One of the following may be the cause of the problem.
● The electr
onic key battery may be discharged. ( P. 1 8 )
● Ther
e may not be sufficient fuel in the vehicle’s tank. 
Add fuel to the vehicle.
● Ther
e may be a malfunction in the steering lock system.
● Ther
e may be a malfunction in the hybrid vehicle immobilizer sys -
tem. 
( P. 6 2 )
■ The interior lights and headlights ar
e 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 12 v
olt battery may be discharged. ( P. 471)
● The 12 v
olt battery terminal connections may be loose or cor -
roded.
■ The interior lights and headlights 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 12 v
olt battery terminals may be discon -
nected.
● The 12 v
olt battery may be discharged. ( P. 471)
Contact your Lexus dealer if the problem cannot be repaired, or if
repair procedures are unknown.

518
What to do if...
What to do if...
A tire puncturesP. 4 5 5 /
456If you have a flat tire
The hybrid system does not start
P. 6 2Hybrid vehicle immobilizer system
P. 4 6 6If the hybrid system will not start
P. 4 7 1If the 12 volt battery is discharged
The shift lever cannot be 
moved outP. 4 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. 4 7 5If your vehicle overheats
The key is lostP. 4 6 8If you lose your keys
The battery runs outP. 4 7 1If the 12 volt battery is discharged
The doors cannot be lockedP. 2 6Doors
The horn begins to soundP. 6 4Alarm
The vehicle is stuck in mud or
sandP. 4 7 8If the vehicle becomes stuck