2012 Lexus ES350 air conditioning

416
4-3. Do-it-yourself maintenance
ES350_U
15ECU-IG NO. 110 A
Moon roof, seat heaters, power win-
dows, clock, automatic windshield
wiper, electric cooling fans, driving
position memory system, seat position
memory system
16ECU-IG NO. 27. 5 A
Anti-lock brake system, vehicle stabil-
ity control system, traction control sys-
tem, brake assist system, cruise
control system, stop lights, shift lock
control system
17A/C NO. 210 AAir conditioning system, rear window
defogger
18WA S H10 AWindshield washer
19S-HTR20 ASeat heaters, air conditioning system
20GAUGE NO. 110 AEmergency flashers, back-up lights,
rear sunshade, charging system
21WIP25 AWindshield wipers
22H-LP LVL7. 5 AHeadlight leveling system
23IGN10 A
Multiport fuel injection system/
sequential multiport fuel injection sys-
tem, SRS airbag system, steering lock
system
24GAUGE NO. 27. 5 AMeters
25ECU-ACC7. 5 AClock, main body ECU
26CIG20 ACigarette lighter
27PWR OUTLET20 APo w e r o u t l e t
28RADIO NO. 27. 5 AAudio system
29MIR HTR15 AOutside rear view mirror defoggers
FuseAmpereCircuit

5
When trouble arises
437
5-1. Essential information
ES350_U
If you think something is wrong
If you notice any of the following symptoms, your vehicle probably needs
adjustment or repair. Contact your Lexus dealer as soon as possible.
■Visible symptoms
●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
■ Audible symptoms
●Changes in exhaust sound
● Excessive tire squeal when cornering
● Strange noises related to the suspension system
● Pinging or other noises related to the engine
■ Operational symptoms
●Engine missing, stumbling or running rough
● 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, sp ongy feeling, pedal almost touches
the floor

480
5-2. Steps to take in an emergency
ES350_U
If your vehicle overheats
If your engine overheats:
Stop the vehicle in a safe place and turn off the automatic 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 sub-
sides 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
instrument cluster) begins to fall and then stop the engine.
If the fan is not operating: Stop the engine immediately and call your local Lexus
dealer.
After the engine has cooled
down sufficiently, check the
engine coolant level and inspect
the radiator core (radiator) for
any leaks.
If the engine compartment
cover needs to be removed:
→P. 3 7 8
STEP1
STEP2
STEP3
STEP4

505
6-1. Specifications
6
Vehicle specifications
ES350_U
Curb weight
The weight of a motor vehicle with standard equip-
ment, including the maximum capacity of fuel, oil and
coolant, and if so equipped, air conditioning and
additional weight optional engine
Maximum loaded vehicle
weight
The sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight
(d) Production options weight
Normal occupant weight150 lb. (68 kg) times the number of occupants speci-
fied in the second column of Table 1
* that follows
Occupant distributionDistribution of occupants in a vehicle as specified in
the third column of Table 1
* below
Production options
weight
The combined weight of installed regular production
options weighing over 5 lb. (2.3 kg) in excess of the
standard items which they replace, not previously
considered in curb weight or accessory weight,
including heavy duty brakes, ride levelers, roof rack,
heavy duty 12-volt battery, and special trim
RimA metal support for a tire or a tire and tube assembly
upon which the tire beads are seated
Rim diameter
(Wheel diameter)Nominal diameter of the bead seat
Rim size designationRim diameter and width
Rim type designationThe industry manufacturer's designation for a rim by
style or code
Rim widthNominal distance between rim flanges
Vehicle capacity weight
(Total load capacity)The rated cargo and luggage load plus 150 lb. (68
kg) times the vehicle's designated seating capacity
Tire related termMeaning

518
6-2. Customization
ES350_U
Automatic air
conditioning
system
(
→P. 2 0 6 )
Switching between out-
side air and recirculated
air mode linked to
“AUTO” switch operation
AutoManual
A/C Auto switch opera-
tionAutoManual
Exhaust gas sensor sensi-
tivityStandard-3 to 3
Illumination
(
→P. 3 1 2 )
Time elapsed before lights
turn off15 seconds
OFF
7. 5 s e c o n d s
30 seconds
Sensitivity of the ambient
light sensor used for dim-
ming the meter lights etc.
Standard-2 to 2
Sensitivity of the ambient
light sensor used for
brightening the meter
lights etc.
Standard-2 to 2
Seat belt
reminder
(
→P. 441)
Vehicle speed linked seat
belt reminder buzzerONOFF
ItemFunctionDefault settingCustomizedsetting

Index
535
ES350_U
Abbreviation list ..................... 536
Alphabetical index .................. 538
What to do if... ........................ 550
For vehicles with a navigation system, refer to the “Naviga-
tion System Owner’s Manual” for information regarding
the equipment listed below.
• Navigation system
• Audio/video system
• Air conditioning
•Climate control
• Rear view monitor system
• Intuitive parking assist

536
ES350_U
Abbreviation list
Abbreviation/Acronym list
ABBREVIATIONSMEANING
A/CAir Conditioning
ABSAnti-lock Brake System
AFSAdaptive Front lighting System
AI-SHIFTArtificial Intelligence Shift
ALRAutomatic Locking Retractor
CRSChild Restraint System
DISPDisplay
ECUElectronic Control Unit
EDREvent data recorder
ELREmergency Locking Retractor
GAWRGross Axle Weight Ratings
GVWRGross Vehicle Weight Rating
I/MEmission inspection and maintenance
LATCHLower Anchors and Tethers for Children
LEDLight Emitting Diode
MMTMethylcyclopentadienyl Manganese Tricarbonyl
MTBEMethyl Tertiary Butyl Ether
OBDOn Board Diagnostics
PCSPre-Collision System
SRSSupplemental Restraint System
TINTire Identification Number
TPMSTire Pressure Warning System
TRACTr a c t i o n C o n t r o l

538
ES350_U
Alphabetical index
Alphabetical index
A/C* ..........................................................206
ABS.............................................................. 182
Adaptive front lighting system ...........151
AFS ................................................................151
Air conditioning filter ......................... 405
Air conditioning systemAir conditioning filter .......................405
Automatic air conditioning system*................................................ 206
Airbags
Airbag operating conditions........... 90
Airbag precautions for your child.......................................................... 94
Airbag warning light ........................440
Curtain shield airbag operating conditions................................................ 91
Curtain shield airbag precautions .......................................... 94
Front passenger occupant classification system......................... 99
General airbag precautions ........... 94
Locations of airbags............................88
Modification and disposal of airbags .................................................... 98
Proper driving posture ............. 86, 94
Side airbag operating conditions................................................ 91
Side airbag precautions .................... 94
SRS airbags .............................................88 Alarm............................................................ 83
Antenna ...................................................... 221
Anti-lock brake system ....................... 182
Armrest .................................................... 332
Ashtray...................................................... 325
Audio input.............................................. 256
Audio system*
Antenna.....................................................221
Audio input........................................... 256
AUX port .............................................. 256
CD player/changer .......................... 224
iPod .......................................................... 238
MP3/WMA disc................................. 231
Optimal use ......................................... 254
Portable music player ..................... 256
Radio ..........................................................217
Steering wheel audio switch.........257
USB memory ...................................... 245
USB port ................................... 238, 245
Automatic air conditioning
system* .................................................. 206
Automatic headlight leveling
system ......................................................152
Automatic light control system.........149
Automatic transmission Automatic transmission ................... 132
If the shift lever cannot be shifted from P.................................... 472
S mode ..................................................... 133
AUX port................................................. 256
Auxiliary box ............................................321A