air condition Lexus GS250 2012 Repair Manual

709 6-3. Do-it-yourself maintenance
6
Maintenance and care
GS350/250_EE (OM30C36E)
16MPX-B10
Smart entry & start system, electric tilt
and telescopic steering column, power
seats, head-up display, front right-hand
door ECU, gauges and meters, steering
sensor, yaw rate and G sensor, overhead
module, front left-hand door ECU,
power trunk lid, clock, body ECU, RR
CTRL SW, CAN gateway ECU
17FILTER10Condenser
18A/C COMP7.5Air conditioning system
19H-LP CLN30Headlight cleaner
20FAN NO.240Electric cooling fans
21LH J/B ALT60Left-hand junction block
22FAN NO.180Electric cooling fans
23P/I-B NO.150H-LP HI RH, H-LP HI LH, DRL, emer-
gency brake signal
24EPB30Parking brake
25LUG J/B-B40Luggage compartment junction block
26R/B-B20EPS-B, TV
27HORN10Horn
28ETCS10Multiport fuel injection system/sequen-
tial multiport fuel injection system
29ALT-S7.5Charging system
30ECU-B7.5Smart entry & start system
31DCM7.5DCM
32D/C CUT30DOME, MPX-B
33ABS NO.250VDIM
34ST30Starting system
35H-LP LO30Headlights, H-LP RLY
FuseAmpereCircuit

713 6-3. Do-it-yourself maintenance
6
Maintenance and care
GS350/250_EE (OM30C36E)
10LH ECU-IG10
VDIM, D-SW MODULE (Blind Spot
Monitor, heated steering wheel), driver
support system, AFS, EPB
11DOOR FL30Outside rear view mirror defoggers,
power window (front left-hand)
12CAPACITOR
(HV)10No circuit
13STRG LOCK15Steering lock
14D/L NO.225Power door lock system
15DOOR RL30Power window (rear left-hand)
16HAZ15Turn signal lights, emergency flashers
17LH-IG210
Multiport fuel injection system/sequen-
tial multiport fuel injection system, stop
lights, smart entry & start system, steer-
ing lock system
18LH J/B-B7.5Body ECU
19S/ROOF20Moon roof
20P/SEAT2 F/L25Power seats
21TI & TE20Electric tilt and telescopic steering col-
umn
22A/C7.5Air conditioning system
FuseAmpereCircuit

7146-3. Do-it-yourself maintenance
GS350/250_EE (OM30C36E)
Right-hand drive vehicles
FuseAmpereCircuit
1P/SEAT1 F/L30Power seats
2D/L NO.125Power door lock system
3NV-IR10No circuit
4FL S/HTR10Seat heaters/ventilators
5STRG HTR15Heated steering wheel
6WIPER-IG5Windshield wipers
7LH-IG10
Seat belts, body ECU, AFS, Remote
Touch screen, overhead module, rain-
drop sensor, moon roof, inside rear view
mirror, LKA, front left-hand door ECU,
Lexus parking assist-sensor, power seats,
CAN gateway ECU
8LH ECU-IG10Yaw rate and G sensor, air conditioning
system, AFS, driver support system
9DOOR FL30Outside rear view mirror defoggers,
power window (front left-hand)
10CAPACITOR
(HV)10No circuit
11AM27.5Power management system, smart entry
& start system
12D/L NO.225Power door lock system
13DOOR RL30Power window (rear left-hand)
14HAZ15Turn signal lights, emergency flashers

715 6-3. Do-it-yourself maintenance
6
Maintenance and care
GS350/250_EE (OM30C36E)
15LH-IG210
Multiport fuel injection system/sequen-
tial multiport fuel injection system, stop
lights, smart entry & start system, steer-
ing lock system
16LH J/B-B7.5Body ECU
17S/ROOF20Moon roof
18P/SEAT2 F/L25Power seats
19A/C7.5Air conditioning system
FuseAmpereCircuit

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)

747
7 7-2. Steps to take in an emergency
When trouble arises
GS350/250_EE (OM30C36E)
If you think something is wrong
Fluid leaks under the vehicle.
(Water dripping from the air conditioning after use is normal.)
Flat-looking tires or uneven tire wear
Engine coolant temperature gauge needle continually points
higher than normal.
Changes in exhaust sound
Excessive tire squeal when cornering
Strange noises related to the suspension system
Pinging or other noises related to the engine
Engine missing, stumbling or running roughly
Appreciable loss of power
Vehicle pulls heavily to one side when braking
Vehicle pulls heavily to one side when driving on a level road
Loss of brake effectiveness, spongy feeling, pedal almost
touches the floor
If you notice any of the following symptoms, your vehicle proba-
bly needs adjustment or repair. Contact any authorized Lexus
dealer or repairer, or another duly qualified and equipped profes-
sional as soon as possible.
Visible symptoms
Audible symptoms
Operational symptoms

7557-2. Steps to take in an emergency
7
When trouble arises
GS350/250_EE (OM30C36E)
When a tire is replaced with a spare tire
Vehicles with a compact spare tire: The compact spare tire is not equipped
with a tire pressure warning valve and transmitter. If a tire goes flat, the tire
pressure warning light will not turn off even though the flat tire has been
replaced with the spare tire.
Vehicles with a full-size spare tire: The spare tire is also equipped with a tire
pressure warning valve and transmitter. The tire pressure warning light will
turn on if the tire inflation pressure of the spare tire is low. If a tire goes flat,
the tire pressure warning light will not turn off even though the flat tire has
been replaced with the spare tire.
Conditions that the tire pressure warning system may not function properly
P. 6 7 8
If the tire pressure warning light frequently comes on after blinking for 1 min-
ute
If the tire pressure warning light frequently comes on after blinking for 1
minute when the engine switch is turned to IGNITION ON mode, have it
checked by any authorized Lexus dealer or repairer, or another duly qualified
and equipped professional.
Warning buzzer
In some cases, the buzzer may not be heard because of noisy place or an
audio sound.

7737-2. Steps to take in an emergency
7
When trouble arises
GS350/250_EE (OM30C36E)
Wa r n i n g m e s s a g eDetailsCorrection procedure
(If equipped)
Indicates that the tire
position information
cannot be recognized
Drive for a short while
and check if the display
updates.
If the radio wave
conditions improve,
the display may
return to normal. If
the tire pressure is
still not displayed
after driving for sev-
eral minutes, stop the
vehicle in a safe
place, turn the engine
switch off then on
again, and start driv-
ing.
If the tire pressure is
still not displayed
even after repeating
this several times,
have the vehicle
inspected by any
authorized Lexus
dealer or repairer, or
another duly quali-
fied and equipped
professional.

8147-2. Steps to take in an emergency
GS350/250_EE (OM30C36E)
CAUTION
When fixing the flat tire
Stop your vehicle in a safe and flat area.
Connect the valve and hose securely with the tire installed on the vehicle.
If the hose is not properly connected to the valve, air leakage may occur or
sealant may be sprayed out.
If the hose comes off the valve while inflating the tire, there is a risk that
the hose will move abruptly due to air pressure.
After inflation of the tire has completed, the sealant may splatter when the
hose is disconnected or some air is let out of the tire.
Keep back from the tire while it is being repaired, as there is a chance of it
bursting while the repair operation is being performed. If you notice any
cracks or deformation of the tire, turn off the compressor switch and stop
the repair operation immediately.
The kit may overheat if operated for a long period of time. Do not operate
the compressor continuously for more than 10 minutes.
Parts of the kit become hot during operation. Be careful handling the kit
during and after operation.
Do not attach the vehicle speed warning sticker to an area other than the
one indicated. If the sticker is attached to an area where an SRS airbag is
located, such as the pad of the steering wheel, it may prevent the SRS air
bag from operating properly.
Driving to spread the liquid sealant evenly
Drive the vehicle carefully at a low speed. Be especially careful when
turning and cornering.
If the vehicle does not drive straight or you feel a pull through the steering
wheel, stop the vehicle and check the following:
• Tire condition. The tire may have separated from the wheel.
• Tire inflation pressure. If tire inflation pressure is 130 kPa (1.3 kgf/cm
2
or bar, 19 psi) or below, this may indicate severe tire damage.

8307-2. Steps to take in an emergency
GS350/250_EE (OM30C36E)
If your vehicle overheats
Stop the vehicle in a safe place and turn off the air conditioning
system.
Check to see if steam is coming out from under the hood.
If you see steam:
Stop the engine. Carefully lift the hood after the steam subsides
and then restart the engine.
If you do not see steam:
Leave the engine running and carefully lift the hood.
Check to see if the cooling fan is operating.
If the fan is operating:
Wait until the temperature of the engine (shown on the instru-
ment panel) begins to fall and then stop the engine.
If the fan is not operating:
Stop the engine immediately and call any authorized Lexus
dealer or repairer, or another duly qualified and equipped profes-
sional.
After the engine has cooled
down sufficiently, check the
engine coolant level and
inspect the radiator core (radi-
ator) for any leaks.
If the engine compartment cover
needs to be removed: P. 6 6 1
1
2
3
4