Subaru Legacy III (2000-2003 year). Service manual — part 870
AC-16
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
SELF-DIAGNOSIS PROCEDURE (LHD MODEL)
1. OPERATING MODE TABLE
6
CHECK INDICATED VALUE OF EACH SEN-
SOR.
1) Turn temperature control dial clockwise by
one click.
2) Each time the “DEF” switch is pressed, the
value indicated on the display changes to
correspond with the ambient sensor, in-
vehicle sensor and intake sensor, in that
order.
3) Make sure there is no big difference
between the temperature indicated on the
display and the measured temperature.
Is a proper input signal value displayed in
each sensor?
Proper input signal value dis-
played.
End
7
CHECK POOR CONTACT.
Check poor contact in A/C control module con-
nector.
Is there poor contact in connector?
There is no poor contact.
Replace A/C con-
trol module.
Repair connector.
Mode display
41
42
43
44
45
46
47
48
Air inlet
REC
REC
REC
FRE
FRE
FRE
FRE
FRE
Air outlet
VENT
VENT
B/L
B/L
B/L
HEAT
D/H
DEF
Air mix door
FULL
COOL
FULL
COOL
FULL
COOL
FULL HOT
FULL HOT
FULL HOT
FULL HOT
FULL HOT
Blower fan
5V
5V
Power sup-
ply voltage
8.5V
8.5V
8.5V
8.5V
Power sup-
ply voltage
A/C compressor
ON
ON
ON
OFF
OFF
OFF
ON
ON
Step
Value
Yes
No
AC-17
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
SELF-DIAGNOSIS PROCEDURE (LHD MODEL)
MEMO:
AC-18
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
SELF-DIAGNOSIS PROCEDURE (RHD MODEL)
6. Self-Diagnosis Procedure (RHD Model)
A: OPERATION
(1) Temperature control dial
(3) FRESH/RECIRC switch
(5) MODE switch
(2) AUTO switch
(4) DEF switch
Step
Value
Yes
No
1
SELECT CONTROL PANEL TO SELF-DIAG-
NOSIS MODE.
1) Turn ignition switch to OFF.
2) While pushing “AUTO” and “FRESH/
RECIRC” switches, turn ignition switch to
ON.
3) Make sure that all characters on the display
blinks four times.
Can it be moved to the self-diagnosis
mode?
It can be moved to self-diagno-
sis mode.
AC-00362
OUT.TEMP
OUT.TEMP
MODE
AUTO
OFF
ECON
A/C
A/C
AUTO
BRIGHT
( 5 )
( 4 )
( 3 )
( 2 )
( 1 )
AC-19
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
SELF-DIAGNOSIS PROCEDURE (RHD MODEL)
1. OPERATING MODE TABLE
2
CHECK EACH SENSOR AND EACH POTEN-
TIOMETER.
1) When indicator check ends, it automatically
switches to sensor and potentiometer
check mode.
2) If system has the trouble for each sensor
and/or each potentiometer, DTC is indi-
cated on indicator.
3) If system has no trouble, DTC “20” is indi-
cated on indicator.
NOTE:
When the sunload sensor is checked inside the
passenger compartment or in the shade, DTC
“25” may appear on the indicator. Always check
the sunload sensor in a place where it senses
direct sunlight.
NOTE:
Diagnosis code appears in order each time the
“A/C” switch is pushed.
Is the DTC “20” indicated on indicator?
DTC “20” is indicated on indi-
cator.
Perform diagnosis
procedure accord-
ing to the dis-
played DTC. <Ref.
to AC-49, DTC
FOR SENSOR
AND POTENTI-
OMETER, LIST
(RHD MODEL),
List of Diagnostic
Trouble Code
(DTC).>
3
CHECK OPERATION OF EACH ACTUATOR,
BLOWER FAN AND COMPRESSOR
CLUTCH.
1) After finishing sensor and potentiometer
check modes, display goes to actuator
check mode when “DEF” switch is pushed.
2) Operate the actuator displaying the DTCs
two times within two seconds of each mode
in order.
3) Select operating mode by pushing every
“DEF” switch.
4) Check the operation for each mode.
• Air inlet:
• Air outlet:
• Air mix door:
• Blower fan:
• A/C compressor:
Does each mode displayed match the oper-
ating mode table? <Ref. to AC-19, OPER-
ATING MODE TABLE, OPERATION, Self-
Diagnosis Procedure (RHD Model).>
Each mode displayed matches
the operating mode table.
End
4
CHECK POOR CONTACT.
Check poor contact in A/C control module con-
nector.
Is there poor contact in connector?
There is no poor contact in A/C
control module.
Replace A/C con-
trol module.
Repair connector.
Mode display
31
32
33
34
35
36
37
38
Air inlet
FRE
REC
REC
FRE
FRE
FRE
FRE
FRE
Air outlet
VENT
VENT
VENT
B/L
HEAT
HEAT
D/H
DEF
Air mix door
FULL
COOL
FULL
COOL
FULL
COOL
50%
50%
FULL HOT
FULL HOT
FULL HOT
Blower fan
LO
LO
ML
ML
ML
MH
MH
HI
A/C compressor
OFF
ON
ON
ON
ON
ON
ON
ON
Step
Value
Yes
No
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