Subaru 2009 IMPREZA, Service Manual

Page: 2738 / 3619

AC(diag)-9
Diagnostic Chart for Self-Diagnosis
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
5. Diagnostic Chart for Self-Diagnosis
A: OPERATION
1. A/C CONTROL PANEL SELF-DIAGNOSIS
(1) Defroster switch (4) A/C switch (7) OFF switch
(2) Rear window defogger switch (5) Fan speed control dial (8) Temperature adjustment dial
(3) Air flow control dial (6) FRESH/RECIRC switch (9) AUTO switch
Step Check Yes No
1 SELECT SELF-DIAGNOSIS MODE IN THE
CONTROL PANEL.
1) Set the air flow control dial and the fan
speed control dial to AUTO.
2) Start the engine with the A/C switch and the
FRESH/RECIRC switch pressed.
Does the self-diagnosis mode
operate? Go to step 2 . <Ref. to AC(diag)-
13, A/C OR SELF-
DIAGNOSIS SYS-
TEMS DO NOT
OPERATE, Diag-
nostics for A/C
System Malfunc-
tion.>
2 CHECK THE LIGHTING OF THE LED.
Make sure that all switch LEDs on the control
panel illuminate.
Do all LEDs blink eight times? Go to step 3 . Replace the con-
trol panel.
3 CHECK SENSOR MALFUNCTION.
1) Set the air flow control dial and the fan
speed control dial to AUTO.
2) If the system has trouble for each sensor,
the FRESH/RECIRC switch LED blinks or is
turned off.
3) If the system has no malfunctions, the
FRESH/RECIRC switch LED is illuminated.
Does the FRESH/RECIRC
switch LED illuminate? Go to step 5 . Go to step 4 .
4 CONFIRM MALFUNCTIONING SENSOR.
1) Set the air flow control dial to AUTO.
2) Turn the fan speed control dial to each mode
position, and check each switch LED illumina-
tion according to sensor check table. <Ref. to
AC(diag)-11, SENSOR CHECK TABLE, OPER-
ATION, Diagnostic Chart for Self-Diagnosis.>
When turning the fan speed
control dial to each mode posi-
tion, does the FRESH/RECIRC
switch LED go off? Go to step 5 . Repair the defec-
tive sensor. <Ref.
to AC(diag)-28,
Diagnostic Proce-
dure for Sensors.>
(1)
(2)
(3)
(4)
(5)
(6)
(8)
(9)
AC-01880
(7)
(9)