2008 Lexus GS450h lights

468
4-3. Do-it-yourself maintenance
GS_HV_U
December 27, 2007 1:38 pm
■Luggage compartment
FuseAmpereCircuit
1RR TAIL10Tail lights, license plate lights
2STOP LP R10High mounted stoplights, stoplights
3STOP LP L10Stoplights, back-up light
4RR FOG7. 5
5RR-B10Trunk light
6RR-IG110Pre-collision seat belt, seat belt pre-
tensioners
7RR-IG210
8PSB30Pre-collision seat belt
9RR S/SHADE7. 5Rear sunshade
10RH J/B-B30FR DOOR RH, RR DOOR RH,
AM2
11LH J/B-B30FR DOOR LH, RR DOOR LH, 
RAD No.3
12R/B-B15D/C cut

469
4-3. Do-it-yourself maintenance
4
Maintenance and care
GS_HV_U
December 27, 2007 1:38 pm
■Luggage compartment 
(vehicles with active stabilizer suspension system)
FuseAmpereCircuit
1STB FR50Front stabilizer
2STB RR30Rear stabilizer
3STB DC/DC30DC/DC converter
■After a fuse is replaced
●If the lights do not turn on even afte r the fuse has been replaced, a bulb may
need replacement. ( P. 4 74 )
●If the replaced fuse blows again, have the vehicle inspected by your Lexus
dealer.
■If there is an overload in the circuits
The fuses are designed to blow before the entire wiring harness is damaged.

478
4-3. Do-it-yourself maintenance
GS_HV_U
December 27, 2007 1:38 pm
■Bulbs other than the above
If any of the bulbs listed below has burnt out, have your Lexus dealer
replace it.
●Headlight low beams (high-intensity discharge bulbs)
● Fog lights
● Front turn signal lights
● Front side marker lights
● Side turn signal lights
● Tail/stop lights
● Tail lights
● Rear side marker lights
● High mounted stoplight
● License plate lights
■Condensation build-up on the inside of the lens
Contact your Lexus dealer for more inform ation in the following situations. Tempo-
rary condensation build-up on the inside of the headlight lens does not indicate a
malfunction.
●Large drops of water are built up on the inside of the lens.
●Water has built up inside the headlight.
■LED light bulbs
The side turn signal lights, tail, tail/stop and high mounted stoplights consist of a
number of LEDs. If any of the LEDs burn out, take your vehicle to your Lexus dealer
to have the light replaced.
If two or more LEDs in a stoplight burn out, your vehicle may not conform to local
laws (SAE).

479
4-3. Do-it-yourself maintenance
4
Maintenance and care
GS_HV_U
December 27, 2007 1:38 pm
■High-intensity discharge (HID) headlights
If voltage to the high-intensity discharge bulbs is insufficient, the light may not come
on, or may go out temporarily. The high-i ntensity discharge bulbs will come on
when normal power is restored.
CAUTION
■Replacing light bulbs
●Turn off the headlights. Do not attempt to replace the bulb immediately after turn-
ing off the headlights. 
The bulbs become very hot and may cause burns.
●Do not touch the glass portion of the light bulb with bare hands. Hold the bulb by
the plastic or metal portion. 
If the bulb is scratched or dropped it may blow out or crack.
●Fully install light bulbs and any parts used to secure them. Failing to do so may
result in heat damage, fire, or water ente ring the headlight unit. This may damage
the headlights or cause condensation to build up on the lens.
●Do not attempt to take apart or repair the low beam discharge headlight bulbs,
connectors, power supply circuits, or related components. 
Doing so could result in electric shock and death or serious injury.
■High-intensity discharge (HID) headlights
●Contact your Lexus dealer before replac ing high-intensity discharge headlights
(including light bulbs).
●Do not touch the high-intensity discharge headlight’s high voltage socket when
the headlights are turned on. 
An extremely high voltage of 20000 V wi ll be discharged and could result in
death or serious injury by electric shock.
■To prevent damage or fire
Make sure bulbs are fully seated and locked.

5
When trouble arises
491
GS_HV_U
December 12, 2007 3:50 pm
5-2. Steps to take in an emergency
If a warning light turns on or a warning buzzer sounds...
Stop the vehicle immediately. Continuing to drive the vehicle may be
dangerous.
The following warning in dicates a possible problem in the brake system.
Immediately stop the vehicl e in a safe place and contact your Lexus
dealer.
*1: Parking brake engaged warning buzzer:
 P. 5 0 6
Stop the vehicle immediately.
The following warning indicates the po ssibility of damage to the vehicle
that may lead to an ac cident. Immediately stop the vehicle in a safe place
and contact your Lexus dealer.
Warning lightWarning light/Details
(U.S.A.)

(Canada)
Brake system warning light (warning buzzer) *1
•Low brake fluid
• Malfunction in the brake system
This light also comes on when the parking brake is not
released. If the light turns off after the parking brake is fully
released, the system is operating normally.
Warning lightWarning light/Details
Charging system warning lightMalfunction in the vehicle’s charging system.
Calmly perform the following actions if any of the warning lights turn on or
flash. If a light turns on or flashes, bu t then turns off, this does not necessar-
ily indicate a malfunction in the system.

5
When trouble arises
495
5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
■Front passenger detection sensor and passenger seat belt reminder
●If luggage is placed on the front passenger seat, the front passenger detection
sensor may cause the warning light to flash, even if a passenger is not sitting in
the seat.
●If a cushion is placed on the seat, the sensor may not detect a passenger, and the
warning light may not operate properly.
■SRS warning light
This warning light system monitors the following:
●The airbag sensor assembly
●Front airbag sensors
●The curtain shield and rear side airbag sensors
●The side and curtain shield airbag sensors
●The front passenger occupant classification ECU
●“AIR BAG ON” and “AIR BAG OFF” indicator lights
●The pressure sensor
●The belt tension sensor
●The seat belt buckle switches
●The driver’s seat position sensor
●The inflators
●The warning light
●The interconnecting wiring and power sources
■If the tire pressure warning light comes on after blinking for 1 minute frequently
If the tire pressure warning light comes on after blinking for 1 minute frequently
when the “POWER” switch is turned to ON mode, have it checked by your Lexus
dealer.

5
When trouble arises
501
5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
Have the vehicle inspected immediately.A buzzer sounds and a warning message is shown on the multi-informa-
tion display. Failing to investigate the cause of the following warnings may
lead to the system operating abnormally and possibly cause an accident.
Have the vehicle inspected by your Lexus dealer immediately.
Wa r n i n g m e s s a g eDetails
Malfunction in the automatic headlight leveling sys-
tem.
Malfunction in the rear lights system.
Malfunction in the tire pressure warning system.
The tire pressure warning light comes on after blink-
ing for 1 minute.
(Flashing)
Malfunction in the steering lock system.

528
5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
If the hybrid system will not start
If the hybrid system will not start even though correct starting procedures
are being followed (
P. 138), 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 electronic key battery may be discharged. ( P. 5 3 1 )
● There may not be sufficient fuel in the vehicle’s tank. 
Add fuel to the vehicle.
● There may be a malfunction in the steering lock system.
● There may be a malfunction in the immobilizer system. 
( P. 88)
■ The 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 12 volt battery may be discharged. ( P. 5 3 4 )
● The 12 volt 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 volt battery terminals may be discon-
nected.
● The 12 volt battery may be discharged. ( P. 5 3 4 )
Contact your Lexus dealer if the problem cannot be repaired, or if
repair procedures are unknown.