Lexus ES300 (2002 year). Service manual — part 320

056CH-01

I30150

Inspector’s name:

Customer’s Name

Registration No.

Registration Year

Frame No.

Odometer Reading

km
Miles

Date vehicle
Brought In

/ /

Date of Problem Occurrence

How Often does Problem Occur?

Weather

Outdoor Temperature

/ /

Continuous

Intermittent ( times a day)

Fine

Cloudy

Snowy

Various / Other

Hot

Warm

Cool

Cold (Approx.

°

F

°

C

)

Symptoms

Blower motor does not operation

Blower motor speed does not change

(Always Hi, Always Med, Always Lo)

Air Flow Control is
Faulty

Cabin temperature does not go down

Response is slow

Cannot change between FRS and REC

(Always Fresh or always Recirculating)

Will not enter the desired mode

Temperature
Control is Faulty

Air Inlet Control is
Faulty

Vent Control is
Faulty

DTC Check

1st Time

2nd Time

Normal Code

Malfunction Code (Code )

Normal Code

Malfunction Code (Code )

AIR CONDITIONING SYSTEM Check Sheet

Cabin temperature does not rise

Mode will not change

-

DIAGNOSTICS

AIR CONDITIONING SYSTEM

05-457

610

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

CUSTOMER PROBLEM ANALYSIS CHECK

056CI-01

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

Indicator Check

DTC Check

(Sensor Check)

(continuous operation)

DTC Check

(Sensor Check)

(stepped operation)

Cancel check mode and can start A/C control.

OFF

OFF

DEF

DEF

Actuator Check

(continuous operaiton)

DEF

OFF

Actuator Check

(stepped operation)

OFF

DEF

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

R/F

R/F

R/F

AUTO

: Indicates a switch operation

AUTO

AUTO

I31457

AUTO

R/F

05-458

-

DIAGNOSTICS

AIR CONDITIONING SYSTEM

611

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

PRE-CHECK

1.

LIST OF OPERATION METHODS

(a)

By operating each of the A/C control switches as shown the diagram below, it is possible to enter the
diagnosis check mode.

2.

INDICATOR CHECK

(a)

Turn the ignition switch ON while pressing the A/C control
AUTO switch and R/F switch simultaneously.

I31432

1 Sec.

1 Sec.

ON

OFF

I31458

DTC

I31395

ECU-B

Driver Side J/B

-

DIAGNOSTICS

AIR CONDITIONING SYSTEM

05-459

612

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

(b)

Check that the indicators light up and go off at second in-
tervals 4 times in succession.

HINT:

After the indicator check is completed, the system enters
the DTC begins automatically.

Press the OFF switch when desiring to cancel the check
mode.

3.

DTC CHECK (SENSOR CHECK)

(a)

Perform an indicator check. After the indicator check is
completed, the system enters the DTC check mode auto-
matically.

(b)

Read the code displayed on the panel. Refer to the list
of codes on page

05- 461

when reading the codes.

(Trouble code are output at the temperature display.)

(c)

If the slower display is desired, press the FRONT DEF
switch and change it to stepped operation. Each time the
FRONT DEF switch is pressed, the display changes by 1
step.

4.

CLEARING DTC

(a)

To clear diagnostic trouble code, there are 2 ways.
(1)

During sensor check, press the ”FRONT DEF”
switch and ”REAR. DEF” switch at the same time.

(2)

Pull the ECU-B fuse in engine room J/B for 20 sec.
or longer to clear the DTC memory.

I31435

1 Sec.

1 Sec.

ON

OFF

Blower level

Step No.

Display

code

Conditions

Air flow vent

Air inlet damper

Magnetic clutch

”COLD” side

(Full closed)

Air mix damper

OFF

FRESH

FACE

0

1

2

3

4

6

7

8

9

10

4

5

1

14

14

14

14

14

14

14

31

0

1

2

3

6

7

8

4

5

9

FACE

FACE

FACE

FACE

B/L

FOOT

FOOT

FOOT/ DEF

DEF

FRESH

RECIRCULATION

RECIRCULATION

RECIRCULATION

RECIRCULATION

RECIRCULATION

RECIRCULATION

OFF

ON

ON

ON

ON

ON

ON

ON

ON

”COLD” side

(Full closed)

”COLD” side

(Full closed)

”COLD” side

(Full closed)

”COLD”/ ”HOT ”

(50 % open)

”COLD”/ ”HOT ”

(50 % open)

”HOT” side

(Full opened)

”HOT” side

(Full opened)

”HOT” side

(Full opened)

FRESH

FRESH/

RECIRCULATION

”HOT” side

(Full opened)

05-460

-

DIAGNOSTICS

AIR CONDITIONING SYSTEM

613

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

5.

ACTUATOR CHECK

(a)

After entering the DTC check mode (Sensor Check
Mode) press the R/F switch.

(b)

Since each damper, motor and relay automatically oper-
ates at 1 sec. intervals beginning in order from 10 in the
temperature display, check the temperature and air flow
visually and by hand.
If the slower display is desired, press the DEF switch and
change it to step operation. Each time the DEF switch is
pressed, the display changes by 1 step.

HINT:

Code are displayed in order from the smaller to the larger
numbers.

To cancel the check mode, press the OFF switch.