Lexus ES300 (2002 year). Service manual — part 322
056DI-01
I31436
A16
A14
A15
-
DIAGNOSTICS
AIR CONDITIONING SYSTEM
05-465
618
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
TERMINALS OF ECU
HEATER CONTROL HOUSING SUB-ASSY (A/C Amplifier)
Symbols (Terminals No.)
Wiring Color
Condition
STD Voltage (V)
A/CS
⇔
GND
(A14-2
⇔
A15-21)
P-L
⇔
W-B
Ignition switch: ON
A/C switch: OFF
→
ON
Below 1.0 V
→
10 - 14 V
TW
⇔
GND
(A14-4
⇔
A15-21)
Y-G
⇔
W-B
Ignition switch: ON
Pulse generation
AC1
⇔
GND
(A14-6
⇔
A15-21)
Y-B
⇔
W-B
Ignition switch: ON
Magnetic clutch: OFF
→
ON
3.7 - 4.5 V
→
1.3 - 2.6 V
A/CI
⇔
GND
(A14-7
⇔
A15-21)
B
⇔
W-B
Ignition switch: ON
Magnetic clutch: OFF
→
ON
10 - 14 V
→
Below 1.0 V
LP
⇔
GND
(A14-10
⇔
A15-21)
V
⇔
W-B
During set preparation
3 - 5 V
PBEW
⇔
GND
(A14-16
⇔
A15-21)
L-Y
⇔
W-B
Seat belt warning light blinks
Below 1.0 V
→
10 - 14 V
SPD
⇔
GND
(A15-1
⇔
A15-21)
V-W
⇔
W-B
Start engine and turn wheel
Pulse generation
BLW
⇔
GND
(A15-2
⇔
A15-21)
L-O
⇔
W-B
Ignition switch: ON
Blower switch: ON
Pulse generation
HR
⇔
GND
(A15-3
⇔
A15-21)
L-W
⇔
W-B
Ignition switch: ON
Blower switch: OFF
→
ON
10 - 14 V
→
Below 1.0 V
PSW
⇔
GND
(A15-4
⇔
A15-21)
L-B
⇔
W-B
Start engine
Refrigerant pressure: Normally
→
Less than 196 kpa (2.0
kgf/cm
2
, 28 psi) or more than 3,140 kpa (32.0 kgf/cm
2
, 455
psi)
Below 1.0 V
→
0
RDEF
⇔
GND
(A15-5
⇔
A15-21)
Y-G
⇔
W-B
Rear defogger switch: ON
→
OFF
Below 1.0 V
→
10 - 14 V
TAM
⇔
SG-6
(A15-8
⇔
A15-39)
G-R
⇔
W-B
Ignition switch: ON
Ambient temp.: 25
C (77
F)
→
40
C (104
F)
1.35 - 1.75 V
→
0.85 - 1.25 V
TPI
⇔
SG-2
(A15-9
⇔
A15-35)
L-R
⇔
LG-B
Ignition switch: ON
R/F switch: FRESH
→
RECIRCULATION
1.0 V
→
4.0 V
S5-1
⇔
GND
(A15-10
⇔
A15-21)
V
⇔
W-B
Ignition switch: LOCK
→
ON
0
→
5.0 V
B
⇔
GND
(A15-11
⇔
A15-21)
W-R
⇔
W-B
Always
10 - 14 V
IG+
⇔
GND
(A15-12
⇔
A15-21)
L-B
⇔
W-B
Ignition switch: LOCK
→
ON
0
→
10 - 14 V
AMDH
⇔
GND
(A15-13
⇔
A15-21)
B-W
⇔
W-B
Ignition switch: ON
Set temp.: MAX. COOL
→
MAX. HOT (*1)
Below 1.0 V
→
10 - 14 V
AMDC
⇔
GND
(A15-14
⇔
A15-21)
LG-R
⇔
W-B
Ignition switch: ON
Set temp.: MAX. HOT
→
MAX. COOL (*1)
Below 1.0 V
→
10 - 14 V
AMPH
⇔
GND
(A15-15
⇔
A15-21)
LG
⇔
W-B
Ignition switch: ON
Set temp.: MAX. COOL
→
MAX. HOT (*1)
Below 1.0 V
→
10 - 14 V
AMPC
⇔
GND
(A15-16
⇔
A15-21)
L-W
⇔
W-B
Ignition switch: ON
Set temp.: MAX. HOT
→
MAX. COOL (*1)
Below 1.0 V
→
10 - 14 V
05-466
-
DIAGNOSTICS
AIR CONDITIONING SYSTEM
619
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
Symbols (Terminals No.)
STD Voltage (V)
Condition
Wiring Color
AOF
⇔
GND
(A15-17
⇔
A15-21)
P
⇔
W-B
Ignition switch: ON
Mode select: DEF
→
FACE (*1)
Below 1.0 V
→
10 - 14 V
AOD
⇔
GND
(A15-18
⇔
A15-21)
O
⇔
W-B
Ignition switch: ON
Set air flow setting: FACE
→
DEF (*1)
Below 1.0 V
→
10 - 14 V
AIF
⇔
GND
(A15-19
⇔
A15-21)
L
⇔
W-B
Ignition switch: ON
R/F switch: RECIRCULATION
→
FRESH (*1)
Below 1.0 V
→
10 - 14 V
AIR
⇔
GND
(A15-20
⇔
A15-21)
R-L
⇔
W-B
Ignition switch: ON
R/F switch: FRESH
→
RECIRCULATION (*1)
Below 1.0 V
→
10 - 14 V
GND
⇔
Body ground
(A15-21
⇔
Body ground)
W-B
⇔
Body ground
Always
Continuity
TE
⇔
SG
(A15-23
⇔
A15-40)
L-W
⇔
LG-B
Evaporator temp.: 0
C (32
F)
→
15
C (59
F)
2.0 - 2.4 V
→
1.4 - 1.8 V
TR
⇔
SG-5
(A15-24
⇔
A15-38)
B
⇔
LG-B
Ignition switch: ON
Ambient temp.: 25
C (77
F)
→
40
C (104
F)
1.8 - 2.2 V
→
1.2 - 1.6 V
TSD
⇔
Body ground
(A15-25
⇔
Body ground)
V
⇔
Body ground
Ignition switch: ON
Solar sensor subject to electric light
0.8 V
→
3.3 V
TSP
⇔
Body ground
(A15-26
⇔
Body ground)
O
⇔
Body ground
Ignition switch: ON
Solar sensor subject to electric light
0.8 V
→
3.3 V
TPD
⇔
SG-3
(A15-27
⇔
A15-36)
L-R
⇔
LG-B
Ignition switch: ON
Set temp.: MAX. HOT
→
MAX. COOL
1.0 V
→
4.0 V
TPO
⇔
SG-1
(A15-28
⇔
A15-34)
B-Y
⇔
LG-B
Ignition switch: ON
Set air flow setting :DEF
→
FACE
1.0 V
→
4.0 V
TPP
⇔
SG-4
(A15-29
⇔
A15-37)
B-R
⇔
L-B
Ignition switch: ON
Set temp.: MAX. HOT
→
MAX COOL
1.0 V
→
4.0 V
S5-2
⇔
GND
(A15-30
⇔
A15-21)
V
⇔
W-B
Ignition switch: LOCK
→
ON
0
→
5.0 V
S5-3
⇔
GND
(A15-31
⇔
A15-21)
V
⇔
W-B
Ignition switch: LOCK
→
ON
0
→
5.0 V
S5-4
⇔
GND
(A15-32
⇔
A15-21)
G-B
⇔
W-B
Ignition switch: LOCK
→
ON
0
→
5.0 V
SG-1
⇔
Body ground
(A15-34
⇔
Body ground)
LG-B
⇔
Body ground
Always
Continuity
SG-2
⇔
Body ground
(A15-35
⇔
Body ground)
LG-B
⇔
Body ground
Always
Continuity
SG-3
⇔
Body ground
(A15-36
⇔
Body ground)
LG-B
⇔
Body ground
Always
Continuity
SG-4
⇔
Body ground
(A15-37
⇔
Body ground)
L-B
⇔
Body ground
Always
Continuity
SG-5
⇔
Body ground
(A15-38
⇔
Body ground)
LG-B
⇔
Body ground
Always
Continuity
SG-6
⇔
Body ground
(A15-39
⇔
Body ground)
B-W
⇔
Body ground
Always
Continuity
SG
⇔
Body ground
(A15-40
⇔
Body ground)
LG-B
⇔
Body ground
Always
Continuity
SHDE
⇔
Body ground
(A16-1
⇔
Body ground)
LG-B
⇔
Body ground
Always
Continuity
SHDT
⇔
SHDE
(A16-2
⇔
A16-1)
B-L
⇔
LG-B
Ignition switch: ON
Temp. of seat heater sensor: 30
C (86
F)
→
50
C (122
F)
2.6 - 3.0 V
→
1.8 - 2.2 V
SHP+
⇔
GND
(A16-3
⇔
A15-21)
L
⇔
W-B
Ignition switch: ON
10 - 14 V
SHPE
⇔
Body ground
(A16-4
⇔
Body ground)
B
⇔
Body ground
Always
Below 1V
SHPT
⇔
SHPE
(A16-5
⇔
A16-4)
LG
⇔
B
Ignition switch: ON
Temp. of seat heater sensor: 30
C (86
F)
→
50
C (122
F)
2.6 - 3.0 V
→
1.8 - 2.2 V
I30693
E10
E9
E8
E7
E6
-
DIAGNOSTICS
AIR CONDITIONING SYSTEM
05-467
620
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
Symbols (Terminals No.)
STD Voltage (V)
Condition
Wiring Color
SHD+
⇔
GND
(A16-6
⇔
A15-21)
L
⇔
W-B
Ignition switch: ON
10 - 14 V
SHD-
⇔
GND
(A16-7
⇔
A15-21)
R-B
⇔
W-B
Ignition switch: ON
Seat heater switch: OFF
→
ON
0
→
10 - 14 V
SHP-
⇔
GND
(A16-8
⇔
A15-21)
R-Y
⇔
W-B
Ignition switch: ON
Seat heater switch: OFF
→
ON
0
→
10 - 14 V
*1: When the servomotor is it operation.
ECM
Symbols (Terminals No.)
Wiring Color
Condition
STD Voltage (V)
HP
⇔
Body ground
(E7-1
⇔
Body ground)
BR
⇔
Body ground
Always
Continuity
ACMG
⇔
E1
(E7-3
⇔
E8-1)
L-W
⇔
BR
Engine start
A/C switch: OFF
→
ON
10 - 14 V
→
Below 1.0 V
THWO
⇔
E1
(E7-14
⇔
E8-1)
Y-G
⇔
BR
Ignition switch: ON
Pulse generation
A/CS
⇔
E1
(E7-31
⇔
E8-1)
P-L
⇔
BR
Engine start
A/C switch: OFF
→
ON
Below 1.0 V
→
10 - 14 V
THR
⇔
E1
(E7-32
⇔
E8-1)
Y-B
⇔
BR
Engine start
A/C switch: OFF
→
ON
3.7 - 4.5 V
→
1.3 - 2.6 V
A/CI
⇔
E1
(E7-33
⇔
E8-1)
B
⇔
BR
Engine start
A/C switch: OFF
→
ON
10 - 14 V
→
Below 1.0 V
LCKI
⇔
E1
(E8-23
⇔
E8-1)
W-L
⇔
BR
Engine start
A/C switch: OFF
→
ON
Pulse generation
E1
⇔
Body ground
(E8-1
⇔
Body ground)
BR
⇔
Body ground
Always
Continuity
056CK-01
05-468
-
DIAGNOSTICS
AIR CONDITIONING SYSTEM
621
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
PROBLEM SYMPTOMS TABLE
Symptom
Suspect Area
See page
Whole functions of the A/C system does not operate.
1. IG power source circuit
2. Heater control housing sub-assy (A/C amplifier)
Air Flow Control : No blower operation
1. Heater relay circuit
2. Blower motor circuit
3. Heater control housing sub-assy (A/C amplifier)
Air Flow Control : No blower control
1. Blower motor circuit
Air Flow Control : Insufficient air out
1. Blower motor circuit
2. Heater control housing sub-assy (A/C amplifier)
Temperature Control : No cool air comes out
1. Volume of refrigerant
2. Drive belt tension
3. Refrigerant pressure
4. Compressor lock sensor circuit
5. Compressor circuit
6. Pressure switch circuit
7. Air mix control servomotor circuit
(Driver side)
(Passenger side)
8. Air mix damper position sensor circuit
(Driver side)
(Passenger side)
9. Room temp. sensor circuit
10.Ambient temp. sensor circuit
11.Vehicle speed signal circuit
12.Heater control housing sub-assy (A/C amplifier)
Temperature Control : No warm air comes out
1. Air mix control servomotor circuit
(Driver side)
(Passenger side)
2. Air mix damper position sensor circuit
(Driver side)
(Passenger side)
3. Ambient temp. sensor circuit
4. Vehicle speed signal circuit
5. Room temp. sensor circuit
6. Evaporator temp. sensor circuit
7. Heater control housing sub-assy (A/C amplifier)
8. Heater radiator
-
Temperature Control : Output air is warmer or cooler than the set
temperature or response is slow.
1. Room temp. sensor circuit
2. Ambient temp. sensor circuit
3. Vehicle speed signal circuit
4. Solar sensor circuit
(Driver side)
(Passenger side)
5. Air mix damper position sensor circuit
(Driver side)
(Passenger side)
6. Air mix control servomotor circuit
(Driver side)
(Passenger side)
7. Water temp. sensor circuit
8. Heater control housing sub-assy (A/C amplifier)
Temperature Control : No temperature control
(only Max. cool or Max. warm)
1. Air mix control servomotor circuit
(Driver side)
(Passenger side)
2. Air mix damper position sensor circuit
(Driver side)
(Passenger side)
3. Heater control housing sub-assy (A/C amplifier)
No air inlet control
1. Air inlet damper control servomotor circuit
2. Air inlet damper postion sensor circuit
3. Heater control housing sub-assy (A/C amplifier)
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