Subaru IMPREZA GD 2007 Series Manual page 3875

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HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Step
1 SELECT SELF-DIAGNOSIS MODE IN THE
CONTROL PANEL.
1) Set the fan speed control dial to the OFF
position.
2) Start the engine and press the A/C switch
for at least 5 seconds. Be sure to press the A/C
switch within 10 seconds after starting engine.
2 CHECK THE LIGHTING OF THE LED.
Make sure that all switch LEDs on the control
panel illuminate.
3 CHECK SENSOR MALFUNCTION.
1) Set the fan speed control dial to the AUTO
position.
2) If the system has trouble for each sensor,
rear window defogger switch LED is turned off.
(Blinks during diagnosis)
3) If the system has no trouble, rear window
defogger switch LED is illuminated.
4 CONFIRM MALFUNCTIONING SENSOR.
1) Turn the fan speed control dial to 1st — 6th
position.
2) Turn the mode switch 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.>
5 CHECK MODE DOOR POSITION SIGNAL.
1) Turn the fan speed control dial to 7th — 12th
position.
2) If the system has trouble for mode door
position signal, rear window defogger switch
LED is turned off.
3) If the system has no trouble, rear window
defogger switch LED is illuminated.
6 CHECK BLOWER FAN OPERATION.
1) Turn the fan speed control dial to 13th —
18th position.
2) Turn the temperature control dial and check
that blower fan speed changes depending on
set temperature.
7 CHECK OPERATION OF EACH ACTUATOR,
BLOWER FAN AND COMPRESSOR
CLUTCH.
1) Turn the fan speed control dial to 19th —
25th position.
2) Select the operating mode by turning air
flow control dial.
3) Check the operation of each mode accord-
ing to operating mode table. <Ref. to AC(diag)-
11, OPERATING MODE TABLE, OPERATION,
Diagnostic Chart for Self-diagnosis.>
• Air inlet
• Air outlet
• Air mix door
• Blower fan
• A/C compressor
Diagnostic Chart for Self-diagnosis
Does the self-diagnosis mode
operate?
Do all LEDs illuminate?
Does the rear window defogger
switch LED illuminate?
Do FRESH/RECIRC and A/C
switch LEDs illuminate when
turning the dial to each mode
position?
Does the rear window defogger
switch LED illuminate?
Does the blower fan speed
change?
Does the operation of each
mode match to operating mode
table?
AC(diag)-10
Check Yes
Go to step 2.
Go to step 3.
Go to step 5.
Go to step 5.
Go to step 6.
Go to step 7.
Press the A/C
switch or turn the
ignition switch to
OFF in order to fin-
ish the self-diagno-
sis.
No
<Ref. to AC(diag)-
12, A/C OR SELF-
DIAGNOSIS SYS-
TEMS DO NOT
OPERATE, Diag-
nostics for A/C
System Malfunc-
tion.>
Check the switch
LED.
Go to step 4.
Repair the defec-
tive sensor. <Ref.
to AC(diag)-25,
Diagnostic Proce-
dure for Sensors.>
Check the mode
door actuator cir-
cuit. <Ref. to
AC(diag)-21,
MODE DOOR
ACTUATOR, Diag-
nostic Procedure
for Actuators.>
Check the blower
motor circuit. <Ref.
to AC(diag)-14,
BLOWER FAN
DOES NOT
ROTATE, Diagnos-
tics for A/C System
Malfunction.>
Repair the mal-
functioning part in
accordance with
each diagnostic
chart.