warning Lexus GS250 2012 Repair Manual

681 6-3. Do-it-yourself maintenance
6
Maintenance and care
GS350/250_EE (OM30C36E)
Certification for tire pressure warning system (vehicles with the tire pressure
warning system)

687 6-3. Do-it-yourself maintenance
6
Maintenance and care
GS350/250_EE (OM30C36E)
CAUTION
When inspecting or replacing tires
Observe the following precautions to prevent accidents.
Failure to do so may cause damage to parts of the drive train as well as dan-
gerous handling characteristics, which may lead to an accident resulting in
death or serious injury.
Do not mix tires of different makes, models or tread patterns.
Also, do not mix tires of remarkably different treadwear.
Do not use tire sizes other than those recommended by Lexus.
Do not mix differently constructed tires (radial, bias-belted or bias-ply
tires).
Do not mix summer, all season and snow tires.
Do not use tires that have been used on another vehicle.
Do not use tires if you do not know how they were used previously.
Vehicles with a compact spare tire: Do not tow if your vehicle has a com-
pact spare tire installed.
Vehicles with an emergency tire puncture repair kit (if equipped): Do not
tow anything if a tire that has been repaired using the emergency tire
puncture repair kit is installed. The load on the tire may cause unexpected
damage to the tire.
When initializing the tire pressure warning system (vehicles with the tire
pressure warning system)
Do not operate the tire pressure warning reset switch without first adjusting
the tire inflation pressure to the specified level. Otherwise, the tire pressure
warning light may not come on even if the tire inflation pressure is low, or
it may come on when the tire inflation pressure is actually normal.

6886-3. Do-it-yourself maintenance
GS350/250_EE (OM30C36E)
CAUTION
Caution regarding interference with electronic devices (vehicles with the
tire pressure warning system featuring a tire inflation pressure display func-
tion)
Users of any electrical medical device other than implanted pacemakers
and implanted cardiac defibrillators should consult the manufacturer of
the device for information about its operation under the influence of radio
waves.
Radio waves could have unexpected effects on the operation of such med-
ical devices.
People with implanted pacemakers or
cardiac defibrillators should not come
within 450mm (17.7 in.) of the tire
pressure warning system initiators. The
radio waves may affect the operation of
such devices.

689
6 6-3. Do-it-yourself maintenance
Maintenance and care
GS350/250_EE (OM30C36E)
NOTICE
Repairing or replacing tires, wheels, tire pressure warning valves, transmit-
ters and tire valve caps (vehicles with the tire pressure warning system)
When removing or fitting the wheels, tires or the tire pressure warning
valves and transmitters, contact any authorized Lexus dealer or repairer,
or another duly qualified and equipped professional as the tire pressure
warning valves and transmitters may be damaged if not handled correctly.
Make sure to install the tire valve caps. If the tire valve caps are not
installed, water could enter the tire pressure warning valves and the tire
pressure warning valves could be bound.
When replacing tire valve caps, do not use tire valve caps other than those
specified. The cap may become stuck.
To avoid damage to the tire pressure warning valves and transmitters (vehi-
cles with the tire pressure warning system)
When a tire is repaired with liquid sealants, the tire pressure warning valve
and transmitter may not operate properly. If a liquid sealant is used, contact
any authorized Lexus dealer or repairer, or another duly qualified and
equipped professional or other qualified service shop as soon as possible.
Make sure to replace the tire pressure warning valve and transmitter when
replacing the tire. (P. 674)

6946-3. Do-it-yourself maintenance
GS350/250_EE (OM30C36E)
When replacing wheels (vehicles with the tire pressure warning system)
The wheels of your vehicle are equipped with tire pressure warning valves
and transmitters that allow the tire pressure warning system to provide
advance warning in the event of a loss in tire inflation pressure. Whenever
wheels are replaced, tire pressure warning valves and transmitters must be
installed. (P. 674)
CAUTION
When replacing wheels
Do not use wheels that are a different size from those recommended in the
Owner’s Manual, as this may result in a loss of handling control.
Never use an inner tube in a leaking wheel which is designed for a tube-
less tire. Doing so may result in an accident, causing death or serious
injury.
NOTICE
Replacing tire pressure warning valves and transmitters (vehicles with the
tire pressure warning system)
Because tire repair or replacement may affect the tire pressure warning
valves and transmitters, make sure to have tires serviced by any autho-
rized Lexus dealer or repairer, or another duly qualified and equipped pro-
fessional or other qualified service shop. In addition, make sure to
purchase your tire pressure warning valves and transmitters at any autho-
rized Lexus dealer or repairer, or another duly qualified and equipped pro-
fessional.
Ensure that only genuine Lexus wheels are used on your vehicle.
Tire pressure warning valves and transmitters may not work properly with
non-genuine wheels.

7166-3. Do-it-yourself maintenance
GS350/250_EE (OM30C36E)
Right side instrument panel
Left-hand drive vehicles
FuseAmpereCircuit
1P/SEAT1 F/R30Power seats
2FR P/OUTLET15Power outlet (front)
3RR P/OUTLET15Power outlet (rear)
4P/SEAT2 F/R25Power seats
5AV S20AV S
6STRG HTR15Heated steering wheel
7WA S H20Windshield washer
8RH ECU-IG10Navigation system, pre-crash seat belts,
air conditioning system
9RH-IG10
Tension reducer, seat heater/ventilator
switches, AWD system, front right-hand
door ECU, nanoe, CAN gateway ECU,
tire pressure warning system, power
seats, driver monitor system
10DOOR FR30
Front right-hand door control system
(outside rear view mirror defoggers,
power window)

7186-3. Do-it-yourself maintenance
GS350/250_EE (OM30C36E)
Right-hand drive vehicles
FuseAmpereCircuit
1STOP7.5Stop lights, high mounted stoplight
2P/SEAT1 F/R30Power seats
3FR P/OUTLET15Power outlet (front)
4P/W-B5Power window master switch
5RR P/OUTLET15Power outlet (rear)
6P/SEAT2 F/R25Power seats
7AV S20AV S
8WIPER30Windshield wipers
9WA S H20Windshield washer
10RH ECU-IG10
Navigation system, VDIM, D-SW
MODULE (Blind Spot Monitor, heated
steering wheel)
11RH-IG10
Tension reducer, AWD system, power
seats, head-up display, front right-hand
door ECU, nanoe, shift lock system,
electric tilt and telescopic steering col-
umn, seat heater/ventilator switches,
smart entry & start system antennas, tire
pressure warning system receiver, driver
monitor system
12DOOR FR30
Front right-hand door control system
(outside rear view mirror defoggers,
power window)

7206-3. Do-it-yourself maintenance
GS350/250_EE (OM30C36E)
Trunk
FuseAmpereCircuit
1PSB30Pre-crash seat belts
2PTL25Power trunk lid
3RR J/B-B10Smart entry & start system
4RR S/HTR20Seat heaters (rear)
5FR S/HTR10Seat heaters/ventilators (front)
6RR FOG10Rear fog light
7DC/DC-S (HV)7.5No circuit
8BATT FAN (HV)20No circuit
9SECURITY7.5SECURITY
10ECU-B NO.37.5Parking brake
11TRK OPN7.5Power trunk lid
12DCM (HV)7.5No circuit
13AC INV (HV)20No circuit
14RR-IG15Radar sensor, Blind Spot Monitor
15RR ECU-IG10
Power trunk lid, parking brake, tension
reducer (rear left-hand), RR CTRL SW,
tire pressure warning system
16EPS-IG5Electric power steering system
17BACK UP7.5Back-up light

737
7When trouble arises
GS350/250_EE (OM30C36E)
7-1. Essential information
Emergency flashers ........... 738
If your vehicle
has to be stopped
in an emergency .............. 7397-2. Steps to take in an emergency
If your vehicle needs
to be towed ..................... 740
If you think something
is wrong .......................... 747
Fuel pump shut off system 748
If a warning light turns on or
a warning buzzer sounds 749
If a warning message
is displayed ..................... 757
If you have a flat tire (vehicles
with a spare tire) ............. 782
If you have a flat tire (vehicles
without a spare tire) ........ 797
If the engine will not start . 815
If the shift lever cannot be
shifted from P ................. 817
If the parking brake
cannot be released........... 818
If the electronic key does not
operate properly .............. 821
If the vehicle battery
is discharged ................... 824
If your vehicle overheats .. 829
If the vehicle
becomes stuck................. 832

749
7 7-2. Steps to take in an emergency
When trouble arises
GS350/250_EE (OM30C36E)
If a warning light turns on or a warning buzzer
sounds
The following warning indicates a possible problem in the brake
system. Immediately stop the vehicle in a safe place and contact
any authorized Lexus dealer or repairer, or another duly qualified
and equipped professional.
Calmly perform the following actions if any of the warning lights
comes on or flashes. If a light comes on or flashes, but then goes
off, this does not necessarily indicate a malfunction in the system.
However, if this continues to occur, have the vehicle inspected by
any authorized Lexus dealer or repairer, or another duly qualified
and equipped professional.
Stop the vehicle immediately. Continuing to drive the vehicle
may be dangerous.
Wa r n i n g
lightWarning light/Details
Brake system warning light (warning buzzer)
• Low brake fluid
• Malfunction in the brake booster system