Lexus ES300 (1997 year). Manual — part 449
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–573
725
1997 LEXUS ES300 (RM511U)
8
Check voltage between terminal ACT of ECM connector and body ground
(See page
).
NG
Check and replace ECM.
OK
9
Check harness and connector between A/C control assembly and ECM
(See page
).
NG
Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown on
matrix chart (See page
).
I00359
FACE
B/L
FOOT
F/D
DEF
L–W
L
L–R
B–L
L–O
4
5
6
7
8
1
2
J21
J20
From HEATER Fuse
Air Outlet Control
Servomotor
B
B
J/C
A/C Control Assembly
W–B
J/C
J15
A
A
II
W–B
4
A13
17
18
19
20
A13
A13
A13
A13
Display Code
Air Flow Mode
0 – 4
5
6 – 7
8
9
FACE
BI–LEVEL
FOOT
FOOT DEF
DEF
DI–574
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
726
1997 LEXUS ES300 (RM511U)
Air Outlet Control Servomotor Circuit
CIRCUIT DESCRIPTION
This circuit turns the servomotor and changes each mode damper position by signals from the A/C control
assembly. When the AUTO switch is ON, the A/C control assembly changes the mode automatically be-
tween FACE, BI–LEVEL. and FOOT according to the temperature setting.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Actuator check.
PREPARATION:
(a)
Set to the actuator check mode (See page
).
(b)
Press the DEF switch and change to step operation.
CHECK:
Press the DEF switch in order and check the condition of air flow
mode.
OK:
The mode changes with the change in the tempera-
ture displaly as shown in the table.
OK
Proceed to next circuit inspeciton shown on
matrix chart (See page
NG
DI0DK–01
I00357
FACE
B–L
FOOT
F/D
DEF
1
3
4
5
6
7
8
2
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–575
727
1997 LEXUS ES300 (RM511U)
2
Check air outlet control servomotor.
PREPARATION:
Remove air outlet control servomotor (See page
CHECK:
(a)
Connect positive (+) lead to teminal 2 and negative (–)
lead to terminal 1.
(b)
Check the lever operation when the negaitive (–) lead is
connected to the teminals shown below.
OK:
The lever moves smoothly to the position for each
mode.
Ground Terminals
Mode
4
FACE
5
BI–LEVEL
6
FOOT
7
FOOT DEF
8
DEF
NG
Replace air outlet control servomotor.
OK
3
Check harness and connector between A/C control assembly and air outlet con-
trol servomotor, air outlet control servomotor and battery, ari outlet control ser-
vomotor and body ground (See page
).
NG
Repair or replace harness or connector.
OK
Repair or replace A/C control assembly.
I00355
A/C Control Assembly
IG
A13
26
GND
A13
14
J/C
J15
A
A
Battery
MAIN FL
ALT
100 A
B–R
J21
B
J20
B J/C
1K
1R
1
3
HEATER
B–Y
Ignition Switch
4
2
W
1K
1B
1
2
AM1
F10
F5
1
1
II
BE3840
I00356
I00372
ON
GND(–)
IG(+)
DI–576
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
728
1997 LEXUS ES300 (RM511U)
IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the A/C control assembly (contains the ECU) and servomotors, etc.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check voltage between terminals IG and GND of A/C control assembly connec-
tor.
PREPARATION:
(a)
Remove fromt ash receptacle (See page
(b)
Remove A/C control assembly with connectors still con-
nected (See page
(c)
Turn ignition switch ON.
CHECK:
Measure voltage between terminals IG and GND of A/C control
assembly.
OK:
Voltage: 10 – 14 V
OK
Proceed to next circuit inspection shown on
matrix chart (See page
NG
DI0DL–01
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