Lexus ES300 (2002 year). Manual — part 45
293
B
31
B
3
C
23
2
1
EF
A
A
Engine Control Module
E 7(B), E 8(C)
A/CS
ACMG
LCKI
Y–G
P–
L
W–
L
BR
BR
B
32
B
33
THR
A/CI
Y–
B
B
IL1
16
B
1
HP
BR
BR
W
* 2 : w/o VSC
* 1 : w/ VSC
3
2
IF5
4
D
iode
(A/
C
)
D 1
L–
W
L
–W
Y–
G
P–L
B
Y–B
A
/C
Lo
c
k
S
e
ns
or
A1
3
3B
129
3B
109
3B
98
3B
118
Junction
Connector
J11
A
IK1
1
IK1
8
IK1
3
P–
L
B
Y–
B
3B
105
3B
125
3B
126
3B
106
106
3B
86
3B
Y–
G
THWO
14 B
Y–G
W
(* 1)
(* 2)
(* 1)
(* 2)
(*1)
(*2)
(*1)
(*2)
V–W
W
a
te
r T
e
m
p
.
S
peedom
et
er
3A
22
3A
82
W
33
11
21
84
3B
64
3B
74
3B
54
3B
W
(* 1)
(* 2)
(* 1)
(* 2)
ID
BR
Y–
G
BR
Power
Micro Computer
10A
GAUGE1
From Power Source System (See Page 56)
2M
1
3A
87
3A
57
W
W
40
C
o
m
b
inat
ion M
e
ter
C 7
294
Air Conditioning
1. Heater Blower Operation
Manual operation
When the blower speed is set to a certain level using the blower control SW, the A/C control assembly sends the signals to
the blower control to control the blower motor speed.
Auto operation
When the auto SW is turned on, the A/C control assembly sends the signals from various sensors and temperature SW to
the blower control to automatically control the blower motor speed.
2. Air Inlet Control Servo Motor Control
When the FRESH/RECIRC select SW is set to RECIRC, the motor in the air inlet control servo motor starts rotating to move
the damper toward the RECIRC side. Since the damper position is detected by the TERMINAL TPI of the A/C control
assembly, the motor is continuously rotated until the damper reaches its stop position.When the FRESH/RECIRC select SW
is set to FRESH, the motor in the air inlet control servo motor starts rotating to move the damper toward the FRESH side.
Since the damper position is detected by the TERMINAL TPI of the A/C control assembly, the motor is continuously rotated
until the damper reaches its stop position.
3. Air Vent Mode Control Servo Motor Control
When the mode select SW is pushed, the ECU in the A/C control assembly activates the air vent mode control servo motor.
This causes the servo motor to rotate to the position (FACE, BI–LEVEL, FOOT, FOOT/DEF, DEF) selected using the mode
select SW, and moves the damper.
4. Air Mix Control Servo Motor Control
When the temperature control SW on the driver’s side is pressed, the ECU in the A/C control assembly sends a signal to the
air mix control servo motor on the driver’s side. This signal drives the motor to reach the temperature set by the temperature
control SW on the driver’s side, and moves the damper. Passenger’s side is operated as same as the driver’s side.
5. Air Conditioning Operation
The A/C control assembly receives various signals, I.E., the engine RPM from the engine control module, out side air
temperature signal from the A/C ambient temp. sensor, coolant temperature from the engine control module and the lock
signal from the A/C compressor, etc.
When the engine is started and the A/C SW (A/C control assembly) is on, a signal is input to the A/C control assembly.
As a result, the ground circuit in A/C control assembly is closed and current flows from HTR (10A) fuse to TERMINAL 1 of
the MG CLT relay to TERMINAL 2 to TERMINAL 3 of the diode (A/C) to TERMINAL 2 to TERMINAL ACMG of the engine
control module to TERMINAL HP to GROUND, turning the MG CLT relay on, so that the magnetic clutch is on and the A/C
compressor operates.
At the same time, the engine control module. Detects the magnetic clutch is on and the A/C compressor operates.
If the A/C control assembly detects the following conditions, it stops the air conditioning:
∗
Evaporator outlet air is too low.
∗
There is a marked difference between the compressor speed and the engine speed.
∗
The refrigerant pressure is abnormally high or abnormally low.
∗
The engine speed is too low.
∗
Rapid acceleration occurs.
P4 Pressure SW
1–4 : Open with the refrigerant pressure at less than approx. 216 kpa (2.2 kgf/cm
2
,
31 psi) or more than
approx. 3138 kpa (32 kgf/cm
2
,
455 psi)
A15 (B) A/C Control Assembly
+B–Ground : Always approx. 12 volts
IG–Ground : Approx. 12 volts with ignition SW at ON or ST position
AIF–Ground : Approx. 12 volts with FRESH SW on
AIR–Ground : Approx. 12 volts with RECIRC SW on
GND–Ground : Always continuity
System Outline
Service Hints
295
: Parts Location
Code
See Page
Code
See Page
Code
See Page
A1
A19
C7
A3
A26
D1
A13
A27
E7
B
A14
A
A28
E8
C
A15
B
A29
J11
A17
B2
P4
A18
B3
T11
: 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)
1F
Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
1J
Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
1L
Engine Wire and Engine Room J/B (Engine Compartment Left)
2G
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
2M
Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)
2R
Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)
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)
IA2
Instrument Panel Wire and Floor No.1 Wire (Left Kick Panel)
IF3
IF5
Engine Room Main Wire and Instrument Panel Wire (Right Side of Steering Column Tube)
IF7
g
( g
g
)
IG1
Instrument Panel Wire and Engine Room Main Wire (Instrument Panel Brace LH)
IJ1
Instrument Panel Wire and Instrument Panel No.3 Wire (Left Side of A/C Unit)
IK1
Instrument Panel Wire and Instrument Panel Wire (Instrument Panel Reinforcement RH)
IL1
Engine Wire and Instrument Panel Wire (Behind the Glove Box)
IM1
Instrument Panel Wire and Cowl No.2 Wire (Behind the Glove Box)
: Ground Points
Code
See Page
Ground Points Location
EB
Right Fender
EC
Left Fender
EF
Intake Side of Cylinder Block
IA
Instrument Panel Reinforcement LH
ID
Instrument Panel Brace RH
IE
Instrument Panel Reinforcement RH
: Splice Points
Code
See Page
Wire Harness with Splice Points
Code
See Page
Wire Harness with Splice Points
I5
Instrument Panel No.2 Wire
56
Power Source
2E
2
3
5
1
2
2A
8
5
1
3
2
1
5
2
3
1
2
5
1
3
2
FL MAIN
3. 0W
Battery
10A FAN RLY
10A GAUGE1
10A GAUGE2
10A HTR
15A SUN–SHADE
15A WASHER
20A SEAT HTR
B–Y
IG1 Relay
DEF Relay
ACC Relay
TAIL Relay
10A MIR HTR
10A RAD NO. 2
15A CIG
15A POWER POINT
10A TAIL
10A PANEL
25A AMP
20A PWR NO. 2
20A PWR NO. 3
30A PWR NO. 1
B
B–
G
B–
G
B–
G
B–
G
B–G
B–G
Generator
G 1
1
B
5A FUEL OPEN
7. 5A OBD
15A FOG
15A STOP
20A PWR NO. 4
1
2
30A PWR SEAT
1
2
40A DEF
25A WIPER
10A ECU–IG
5A ECU–ACC
5A AM1
2
2A
2A
7
1
2E
L–R
W
B–
G
B–G
B–G
25A DOOR NO. 2
1
1
1
1
1
2
1
1
2
0
A AL
T
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