Lexus ES300 (2002 year). Service manual - part 43

284

Combination Meter

B1  Brake Fluid Level Warning SW

1–2 : Closed with the float down

C7 (A)  Combination Meter

(A)40–Ground : Approx. 12 volts with ignition SW at ON or ST position
(A)20–Ground : Always approx. 12 volts
(A) 1, (A) 2, (A) 21–Ground : Always continuity
(A)39–Ground : Approx. 12 volts with ignition SW at ON or ST position

O1  Oil Pressure SW

1–Ground : Continuity with the oil pressure above approx. 20 kpa (2.8 psi, 0.2 kgf/cm

2

)

  :  Parts Location

Code

See Page

Code

See Page

Code

See Page

A14

A

38

C10

38

N3

41

A15

B

38

E5

36

O1

37

B1

36

E7

38

R5

39

B4

38

F15

40

R9

39

C7

A

38

J8

A

39

S18

41

C8

B

38

J9

B

39

W1

37

: 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)

1C

25

Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)

1H

25

Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)

2G

28

Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)

2K

28

Floor No.1 Wire and Driver Side J/B (Lower Finish Panel)

2L

2M

2N

29

Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)

2O

(

)

2R

3A

34 (w/ VSC)

3A

35 (w/o VSC)

Instrument Panel Wire and Passenger Side J/B (Instrument Panel Brace RH)

3B

34 (w/ VSC)

Instrument Panel Wire and Passenger Side J/B (Instrument Panel Brace RH)

3B

35 (w/o VSC)

: Connector Joining Wire Harness and Wire Harness

Code

See Page

Joining Wire Harness and Wire Harness (Connector Location)

IA4

46

Instrument Panel Wire and Floor No.1 Wire (Left Kick Panel)

IF4

IF5

46

Engine Room Main Wire and Instrument Panel Wire (Right Side of Steering Column Tube)

IF7

g

( g

g

)

IK1

48

Instrument Panel Wire and Instrument Panel Wire (Instrument Panel Reinforcement RH)

IL1

48

Engine Wire and Instrument Panel Wire (Behind the Glove Box)

IO2

48

Instrument Panel Wire and Floor No.2 Wire (Right Kick Panel)

Service Hints

285

: Ground Points

Code

See Page

Ground Points Location

EB

44

Right Fender

ED

44

Left Fender

EF

44

Intake Side of Cylinder Block

IA

46

Instrument Panel Reinforcement LH

ID

46

Instrument Panel Brace RH

286

Radiator Fan and Condenser Fan

10A
FAN RLY

2F

9

30A
CDS

1G

2

30A
RDI

2

3

1

5

3

2

5

1

2

5

1

3

4

1

1H

3

1

1

1

From Power Source System (See Page 56)

1

1

1F

6

1E

8

1H

6

1H

7

1K

5

1

1

1

EA1

4

EA1

2

EA2

4

1

2

2

3

1

1H

9

1K

2

IF5

4

B

3

C

8

EA1

3

EA1

1

M

1

2

M

1

2

EC

EB

ED

EA2

3

E 4

1

3

2

B–R

R

G–

W

L

L

B–

R

L

R–

L

W–

L

Y–

G

L–

W

B–

R

L

R–

L

W–

L

L–

W

R

W–

B

W–

B

W–

B

L

G–

W

R

W–

B

W–

B

W–

B

W–

B

W–

B

L

E

n

g

ine C

ont

ro

l Mo

dul

e

E 7

(B

), E

 8

(C

)

FAN
NO. 1
Relay

FAN
NO. 2
Relay

2

1

MG

 C

L

T

 R

e

la

y

CF

ACMG

2

1

W

a

te

r 

T

e

m

p

.  

S

W

No

. 2

W 4

1H

5

A

/C

 C

onde

ns

er

F

an M

o

to

r

A 2

R

a

di

at

or

 F

an 

Mot

o

r

R 1

W

a

te

r 

T

e

m

p

.  

S

W

 N

o

. 

1

W 3

Pr

e

ss

u

re

 SW

P 4

D

iod

e 

(A/

C

)

D 1

B–

R

G

FAN
NO. 3
Relay

B–

R

B–

R

B–R

W–

L

W–

B

L

S

ingl

e

287

Fan Motor Operation

With the ignition SW turned on, the current through the FAN RLY fuse flows to the FAN NO.1 relay (Coil side), FAN NO.2
relay (Coil side) and FAN NO.3 relay (Coil side).

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 FAN RLY fuse flows to the FAN NO.3 relay (Coil side) to TERMINAL 1 of
the diode to TERMINAL 2 to TERMINAL (B) 3 of the engine control module causing the FAN NO.3 relay to turn on. As a
result, the current through the CDS fuse flows to TERMINAL 5 of the FAN NO.3 relay to TERMINAL 3 to TERMINAL 2 of the
A/C condenser fan motor to TERMINAL 1 to TERMINAL 3 of the FAN NO.2 relay to TERMINAL 4 to TERMINAL 2 of the
radiator fan motor to TERMINAL 1 to 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 FAN RLY fuse flows to the FAN NO.3 relay (Coil side) to
TERMINAL 1 of the water temp. SW No.2 to 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

With the pressure SW is turned on and/or the water temp. SW No.1 is turned on, the A/C condenser fan motor and the
radiator fan motor rotate at high speed.
When the pressure SW is turned on, the current through the FAN RLY fuse flows to the FAN NO.1 and NO.2 relay (Coil side)
to TERMINAL 3 of the pressure SW to TERMINAL 2 to GROUND, and the current through the FAN RLY fuse flows to the
FAN NO.3 relay (Coil side) to TERMINAL 1 of the water temp. SW No.2 to GROUND. As a result, FAN NO.1, NO.2. and
NO.3 relay is turned on. At the same time, the current from the RDI fuse flows to FAN NO.1 relay (Point side) to TERMINAL 2
of the radiator fan motor to TERMINAL 1 to GROUND, and the current from the CDS fuse flows to FAN NO.3 relay (Point
side) to TERMINAL 2 of the A/C condenser fan motor to TERMINAL 1 to TERMINAL 3 of the FAN NO.2 relay to TERMINAL
5 to GROUND.
As the current flowing in parallel for motors as above, the motors rotate at high speed.
When the water temp. SW No.1 is turned on, the current through the FAN RLY fuse flows to the FAN NO.1 and NO.2 relay
(Coil side) to TERMINAL 2 of the water temp. SW No.1 to TERMINAL 1 to GROUND, and the current through the FAN RLY
fuse flows to the FAN NO.3 relay (Coil side) to TERMINAL 1 of the diode (A/C) to TERMINAL 2 to TERMINAL (B) 3 of the
engine control module. As a result, FAN NO.1, NO.2 and NO.3 relay is turned on. At the same time, the current from the RDI
fuse flows to FAN NO.1 relay (Point side) to TERMINAL 2 of the radiator fan motor to TERMINAL 1 to GROUND, and the
current from the CDS fuse flows to FAN NO.3 relay (Point side) to TERMINAL 2 of the A/C condenser fan motor to
TERMINAL 1 to TERMINAL 3 of the FAN NO.2 relay to TERMINAL 5 to GROUND.
As the current flowing in parallel for motors as above, the motors rotate at high speed.

P4  Pressure SW

3–2 : Closed above approx. 15.5 kgf/cm

2 

(224 psi, 1520 kpa)

Open below approx. 12.5 kgf/cm

2

 (181 psi, 1225 kpa)

W3  Water Temp. SW NO.1

2–1 : Continuity above approx. 95

°

C (203

°

 F)

W4  Water Temp. SW NO.2

1–Ground : Continuity above approx. 90

°

C (194

°

F)

  :  Parts Location

Code

See Page

Code

See Page

Code

See Page

A2

36

E8

C

38

W3

37

D1

36

P4

37

W4

37

E7

B

38

R1

37

: Relay Blocks

Code

See Page

Relay Blocks (Relay Block Location)

1

22

Engine Room R/B (Engine Compartment Left)

System Outline

Service Hints