Subaru Legacy 2003 Service Manual page 3488

SELF-DIAGNOSIS PROCEDURE (LHD MODEL)
Step
1 SELECT CONTROL PANEL TO SELF-DIAG-
NOSIS MODE.
1) Turn ignition switch to OFF.
2) While pushing "AUTO" and "FRESH/
RECIRC" switches, start the engine.
Can it be moved to the self-diagnosis
mode?
2 CHECK INDICATOR.
1) Turn temperature control dial clockwise by
one click.
2) Make sure that all characters illuminate on
the display.
Does each character illuminate?
3 CHECK EACH SENSOR AND EACH POTEN-
TIOMETER.
1) Turn temperature control dial clockwise by
one click.
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.
Is the DTC "20" indicated on indicator?
4 CHECK DOOR MOTOR POSITION SWITCH.
1) Turn temperature control dial clockwise by
one click.
2) If system has the trouble for each door
position switch, DTC is indicated on indica-
tor.
3) If system has no trouble, DTC "30" is indi-
cated on indicator.
Is the DTC "30" indicated on indicator?
5 CHECK OPERATION OF EACH ACTUATOR,
BLOWER FAN AND COMPRESSOR
CLUTCH.
1) Turn temperature control dial clockwise by
one click.
2) Select operating mode by pushing every
"DEF" switch.
3) 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-16, OPER-
ATING MODE TABLE, OPERATION, Self-
Diagnosis Procedure (LHD Model).>
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Value
It can be moved to self-diagno-
sis mode.
Each character illuminates.
DTC "20" indicated.
DTC "30" indicated.
Each mode displayed match
the operating mode table.
AC-15
Yes
Go to step 2. <Ref. to AC-20, A/
C AND/OR SELF-
DIAGNOSIS SYS-
TEMS DO NOT
OPERATE, Diag-
nostics for A/C
System Failure
(LHD Model).>
Go to step 3. Go to step 7.
Go to step 4. Perform diagnosis
procedure accord-
ing to the dis-
played DTC. <Ref.
to AC-49, DTC
FOR SENSOR
AND POTENTI-
OMETER, LIST
(LHD MODEL),
List of Diagnostic
Trouble Code
(DTC).>
Go to step 5. Perform diagnosis
procedure for
mode door actua-
tor. <Ref. to AC-
58, DTC 31, 32,
33, 34 OR 35
(MODE DOOR
ACTUATOR),
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC) (LHD
Model).>
Go to step 6. Go to step 7.
No