Lexus ES300 (2002 year). 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
C10
N3
A15
B
E5
O1
B1
E7
R5
B4
F15
R9
C7
A
J8
A
S18
C8
B
J9
B
W1
: Relay Blocks
Code
See Page
Relay Blocks (Relay Block Location)
1
Engine Room R/B (Engine Compartment Left)
: Junction Block and Wire Harness Connector
Code
See Page
Junction Block and Wire Harness (Connector Location)
1C
Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
1H
Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
2G
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
2K
Floor No.1 Wire and Driver Side J/B (Lower Finish Panel)
2L
2M
2N
Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)
2O
(
)
2R
3A
3A
Instrument Panel Wire and Passenger Side J/B (Instrument Panel Brace RH)
3B
Instrument Panel Wire and Passenger Side J/B (Instrument Panel Brace RH)
3B
: Connector Joining Wire Harness and Wire Harness
Code
See Page
Joining Wire Harness and Wire Harness (Connector Location)
IA4
Instrument Panel Wire and Floor No.1 Wire (Left Kick Panel)
IF4
IF5
Engine Room Main Wire and Instrument Panel Wire (Right Side of Steering Column Tube)
IF7
g
( g
g
)
IK1
Instrument Panel Wire and Instrument Panel Wire (Instrument Panel Reinforcement RH)
IL1
Engine Wire and Instrument Panel Wire (Behind the Glove Box)
IO2
Instrument Panel Wire and Floor No.2 Wire (Right Kick Panel)
Service Hints
285
: Ground Points
Code
See Page
Ground Points Location
EB
Right Fender
ED
Left Fender
EF
Intake Side of Cylinder Block
IA
Instrument Panel Reinforcement LH
ID
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
E8
C
W3
D1
P4
W4
E7
B
R1
: Relay Blocks
Code
See Page
Relay Blocks (Relay Block Location)
1
Engine Room R/B (Engine Compartment Left)
System Outline
Service Hints
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