Lexus ES300 (1997 year). Service manual — part 659

230

COMBINATION METER

D

D

(HINT : SEE PAGE 7)

F

F

(HINT : SEE PAGE 7)

1

2

4

X

5

6

1

1

2

3

1

2

1

A

J28

B

J29

O 1

GRAY

O 2

BLUE

P 1

GRAY

W 3

GRAY

W 1

BLACK

V 2

BLACK

P 3

X

X

B

B

B

B

(HINT : SEE PAGE 7)

J26

X

X

231

RADIATOR FAN AND CONDENSER FAN

WITH THE IGNITION SW TURNED ON, THE CURRENT THROUGH THE ECU–IG FUSE FLOWS TO THE FAN NO. 1
RELAY (COIL SIDE), FAN NO. 2 RELAY (COIL SIDE) AND FAN NO. 3 RELAY (COIL SIDE). FURTHERMORE, THE
CURRENT THROUGH THE FAN NO. 1 RELAY (COIL SIDE) THE FAN NO. 2 RELAY (COIL SIDE) FLOWS TO TERMINAL 3
OF THE A/C SINGLE PRESSURE SW

→

TERMINAL 2

→

TERMINAL 2 OF THE WATER TEMP. SW NO. 1

→

TERMINAL 1

→

GROUND, CAUSING THE FAN NO. 2 RELAY TO TURN ON.

1. LOW SPEED OPERATION

ONLY WHEN THE A/C SYSTEM IS ACTIVATED OR THE WATER TEMP. SW NO. 2 IS TURNED ON, THE A/C CONDENSER
FAN MOTOR AND THE RADIATOR FAN MOTOR ROTATES AT LOW SPEED.
WHEN THE A/C SYSTEM IS ACTIVATED, THE CURRENT FROM ECU–IG FUSE FLOWS TO THE FAN NO. 3 RELAY (COIL
SIDE)

→

TERMINAL 1 OF THE DIODE (A/C)

→

TERMINAL 2

→

TERMINAL 2 OF THE A/C CONTROL ASSEMBLY,

CAUSING THE FAN NO. 3 RELAY TO TURN ON. AS A RESULT, THE CURRENT THROUGH THE CDS FUSE FLOWS TO
TERMINAL 2 OF THE A/C CONDENSER FAN MOTOR

→

TERMINAL 1

→

TERMINAL 3 OF THE FAN NO. 2 RELAY

→

TERMINAL 5

→

TERMINAL 5 OF THE FAN NO. 3 RELAY

→

TERMINAL 3

→

TERMINAL 2 OF THE RADIATOR FAN

MOTOR

→

TERMINAL 1

→

GROUND. AS THIS FLOWING IN SERIES FOR THE MOTORS, THE MOTORS ROTATE AT

LOW SPEED.
WHEN THE WATER TEMP. SW NO. 2 IS TURNED ON, THE CURRENT FROM ECU–IG FUSE FLOWS TO THE FAN NO. 3
RELAY (COIL SIDE)

→

TERMINAL 1 OF THE WATER TEMP. SW NO. 2

→

GROUND, CAUSING THE FAN NO. 3 RELAY TO

TURN ON. AS A RESULT, THE CURRENT THROUGH THE CDS FUSE FLOWS THE SAME ROUTE AS ABOVE, ROTATING
THE MOTORS AT LOW SPEED.

2. HIGH SPEED OPERATION

ONLY WHEN THE A/C SINGLE PRESSURE SW IS TURNED OFF OR THE WATER TEMP. SW NO. 1 IS TURNED OFF, THE
A/C CONDENSER FAN MOTOR AND THE RADIATOR FAN MOTOR ROTATE AT HIGH SPEED.
WHEN THE A/C SINGLE PRESSURE SW IS TURNED OFF, THE CURRENT FROM THE RDI FUSE FLOWS TO THE FAN
NO. 1 RELAY (POINT SIDE)

→

TERMINAL 2 OF THE RADIATOR FAN MOTOR

→

TERMINAL 1

→

GROUND. AT THE

SAME TIME, THE CURRENT FROM THE CDS FUSE FLOWS TO TERMINAL 2 OF THE A/C CONDENSER FAN MOTOR

→

TERMINAL 1

→

TERMINAL 3 OF THE FAN NO. 2 RELAY

→

TERMINAL 4

→

GROUND.

AS THE CURRENT FLOWING IN PARALLEL FOR THE MOTORS AS ABOVE, THE MOTORS ROTATE AT HIGH SPEED.

A 4 A/C SINGLE PRESSURE SW

3–2 : OPEN ABOVE APPROX. 15.5 KG/CM

2

(220 PSI, 1520 KPA)

CLOSE BELOW APPROX. 12.5 KG/CM

2

(142 PSI, 980 KPA)

W 4 WATER TERMP. SW NO. 1

2–1 : OPEN ABOVE APPROX. 95

°

C (203

°

F)

W 5 WATER TEMP. SW NO. 2

1–GROUND : CLOSE ABOVE APPROX. 90

°

C (198

°

F)

SYSTEM OUTLINE

SERVICE HINTS

232

RADIATOR FAN AND CONDENSER FAN

3

W

A 4

15A
ECU–IG

1A

6

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

30A
RDI

30A
CDS

2

3

1

4

1

5

2

3

3

2

5

1

4

1

5

2

3

4

1

1

1

1

1

1

1

1

1

2K

6

2B

2

M

1

2

M

1

2

2

1

E 3

EA1

2

IK1

1

IM1

5

EA1

1

2

1

EN

G

IN

E

M

A

IN

RE

L

A

Y

FAN
NO. 1
RELAY

B–

R

B–R

B–

R

W–

B

G–W

G–W

L

L

L–W

L–

W

L

DI

O

F

A

N NO

.

3

RE

L

A

Y

RA

DI

A

T

O

R

F

A

N M

O

T

O

R

W–

B

L

W–

R

W–

B

WAT

E

R

T

E

M

P

.

B–

R

B–

R

B–

R

W–

R

W–

B

F

A

N NO

.

2

RE

L

A

Y

G–

W

R

A/C CONDENSER
FAN MOTOR

B–

R

A 2

D 2

W 4

R

1

2

1

1

2

L–

Y

W

A

TE

R

TE

M

P

.

S

W

N

O

.

2

W–

B

W–B

W–B

L

EC

W–

B

W–

B

IM2

7

L–

Y

L

G–W

T

O

E

N

G

INE

CO

N

T

RO

L

MO

D

U

LE

1

W

5

2

MGCR

A

/C

CO

NT

R

O

L

ASSEM

BL

Y

A1

5

10

0A

A

L

T

FUSIBLE
LINK
BLOCK

F 7

1

DE

(

A/

C

)

SW N

O

.

1

2H

2

2C

2

2F

4

2C

1

2F

2

2G

7

2G

1

2C

5

2J

13

2

A/

C

SI

N

G

L

E

PR

ESS

U

R

E S

233

: PARTS LOCATION

CODE

SEE PAGE

CODE

SEE PAGE

CODE

SEE PAGE

A 2

26

D 2

26

W 4

27

A 4

26

F 7

26

W 5

27

A15

28

R 1

27

: RELAY BLOCKS

CODE

SEE PAGE

RELAY BLOCKS (RELAY BLOCK LOCATION)

1

22

ENGINE ROOM R/B (ENGINE COMPARTMENT LEFT)

,,,

,,,

,,,

: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

CODE

SEE PAGE

JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)

1A

24

COWL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)

2B

2C

2F

20

ENGINE ROOM MAIN WIRE AND ENGINE ROOM J/B (ENGINE COMPARTMENT LEFT)

2G

(

)

2H

2J

20

COWL WIRE AND ENGINE ROOM J/B (ENGINE COMPARTMENT LEFT)

2K

20

COWL WIRE AND ENGINE ROOM J/B (ENGINE COMPARTMENT LEFT)

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

CODE

SEE PAGE

JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)

EA1

34

ENGINE ROOM MAIN WIRE AND ENGINE ROOM MAIN NO. 3 WIRE (BEHIND HEADLIGHT LH)

IK1

38

ENGINE WIRE AND COWL WIRE (UNDER THE GLOVE BOX)

IM1

38

ENGINE ROOM MAIN WIRE AND COWL WIRE (RIGHT KICK PANEL)

IM2

38

ENGINE ROOM MAIN WIRE AND COWL WIRE (RIGHT KICK PANEL)

: GROUND POINTS

CODE

SEE PAGE

GROUND POINTS LOCATION

EC

34

LEFT RADIATOR SIDE SUPPORT

: SPLICE POINTS

CODE

SEE PAGE

WIRE HARNESS WITH SPLICE POINTS

CODE

SEE PAGE

WIRE HARNESS WITH SPLICE POINTS

E 3

34

ENGINE ROOM MAIN WIRE

2

1

2

3

1

2

2

1

1

2

1

A 2 GRAY

A 4 BLACK

D 2 ORANGE

R 1 GRAY

W 4 GRAY

W 5 GRAY

X 2

X X

X

1

A15

F 7