Lexus ES300 (2002 year). Service manual — part 78

BODY ELECTRICAL – AIR CONDITIONING

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187BE33

Indicates a switch operation

OFF

OFF

Turn ignition switch ON with
AUTO and R / F switches held
down.

Indicator Check

Sensor Check

(Continuous Operation)

Sensor Check

(Stepped Operation)

Actuator Check

(Continuous Operation)

Actuator Check

(Stepped Operation)

Cancel Check Mode

(Normal Operation Now Possible)

DEF

DEF

R / F

R / F

AUTO

AUTO

R / F

AUTO

If both AUTO and R / F switches
are not pressed at the same time.

OFF

DEF

OFF

DEF

Self-Diagnosis

The air conditioning ECU has a self-diagnosis function. It stores any operation failures in the air condi-

tioning system memory in the form of a malfunction code. By operating switches on the air conditioning
control switches, the stored malfunction code will be indicated. Since diagnostic results are stored direct-
ly by electric power from the battery, they are not cleared even when the ignition switch is turned off.

Functions

Function

Outline

Indicator Check

Checks indicator lights and temperature setting display.

Sensor Check

Checks the past and present malfunctions of the sensors, and clearing the
past malfunction data.

Actuator Check

Checks against actuator check pattern if blower motor, servomotors and
magnetic clutch are operating correctly according to signals from ECU.

The check function can be started by the following procedure shown below.

For details on the indicator check, sensor check, actuator check function, and clearing DTCs of this system,
refer to the 2002 LEXUS ES300 Repair Manual (Pub. No. RM911U).

BODY ELECTRICAL – AIR CONDITIONING

BE-21

Air Conditioning

V

entilation and

Heater Core

AIR CONDITIONING

DESCRIPTION

1. General

The air conditioning system in the ’02 ES300 has the following features:
An automatic control air conditioning system comprising left/right independent temperature control has

been adopted as standard equipment.

A semi-center location air conditioning unit, in which the evaporator and heater core are placed in the ve-

hicle’s longitudinal direction, has been adopted.

A compact, lightweight, and highly efficient straight flow (full-path flow) aluminum heater core has been

adopted.

A multi-tank, super-slim structure evaporator has been adopted.

A compact, lightweight, and low-noise swash plate type compressor has been adopted.

The heater exchange efficiency has been improved through the adoption of the sub-cool condenser.

A deodorizing function that eliminates the exhaust gas smell that enters the cabin from the outside has been

added to the conventional clean air filter.

The air conditioning ECU is equipped with a self-diagnosis function. If there is a malfunction in the sys-

tem, it stores the DTCs (Diagnostic Trouble Codes) in its memory and blinks the air conditioning switch
indicator.

Performance

’01 ES300

Model

’02 ES300

with Clean Air
Filter

without Clean
Air Filter

Heat Output

W (Kcal / h)

5750 (4950)

5220 (4490)

5580 (4800)

Heater

Air Flow Volume

m

3

/ h

360

360

380

Heater

Power Consumption

W

210

220*

Air

Cooling Capacity

W (Kcal / h)

5500 (4730)

5230 (4500)

5350 (4600)

Air
Conditioning

Air Flow Volume

m

3

/ h

530

505

530

Conditioning

Power Consumption

W

260

260

*: With Side Vent Closed

Specification

Model

’02 ES300

’01 ES300

Type

Straight Flow

(Full-path Flow)

U-turn Flow

Heater Core

Size

W x H x L

mm (in.)

228.7 x 140 x 27

(9.0 x 5.5 x 1.1)

220.4 x 155.7 x 27

(8.7 x 6.1 x 1.1)

Fin Pitch

mm (in.)

1.8 (0.07)

2.5 (0.1)

Motor Type

S80Fs-12.5T

Blower

Fan Size

Dia. x H

mm (in.)

150 x 75 (5.9 x 3.0)

Type

Multi-flow (Sub-cool)

3-Passage Flow Type

Condenser

Size

W x H x L

mm (in.)

670 x 387.8 x 16

(26.4 x 15.3 x 0.6)

726 x 415.6 x 22

(28.6 x 16.4 x 0.9)

Fin Pitch

mm (in.)

3.6 (0.14)

4.5 (0.18)

Type

Multi-tank, Super-slim

Structure

Drawn Cup

Evaporator

Size

W x H x L

mm (in.)

266.2 x 255 x 58

(10.5 x 10.0 x 2.3)

252 x 260 x 90

(9.9 x 10.2 x 3.5)

Fin Pitch

mm (in.)

3.5 (0.14)

Compressor

Type

10S17

10PA17Modified

BODY ELECTRICAL – AIR CONDITIONING

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211BE18

Room Temp.
Sensor

Evaporative
Temp. Sensor

Solar Sensor

Ambient Temp.
Sensor

Air Mix
Servomotor

Air Mix Damper
Position Sensor

Air Outlet
Servomotor

Air Outlet Damper
Position Sensor

Air Inlet
Servomotor

Air Inlet Damper
Position Sensor

A / C Pressure
Switch

Air
Conditioning
ECU

Air Conditioning
Control Panel

Engine Coolant
Temp. Sensor

ECM

Combination
Meter

Blower
Controller

Blower
Motor

Lock Sensor

A / C Magnetic
Clutch Relay

A / C Magnetic
Clutch

Speed
Signal

2. System Diagram

BODY ELECTRICAL – AIR CONDITIONING

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211BE19

Condenser

A / C Pressure
Switch

Compressor

Ambient Temp.
Sensor

Solar Sensor

Combination
Meter

A / C Control Panel
(A / C ECU)

ECM

Room Temp.
Sensor

Evaporative
Temp. Sensor

Expansion Valve

Clean Air Filter

Air Inlet
Servomotor

Blower Motor

Blower Controller

Air Mix
Servomotor

Evaporator

Heater Core

Air Outlet
Servomotor

3. Layout of Main Component