Subaru 2009 IMPREZA, Service Manual

Page: 2739 / 3619

AC(diag)-10
Diagnostic Chart for Self-Diagnosis
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
5 CHECK AIR MIX DOOR AND MODE DOOR
POSITION SIGNALS.
1) Set the air flow control dial to FACE.
2) Turn the fan speed control dial to AUTO.
3) If there is a system malfunction in the air mix
door signal or the mode door position signal, the
FRESH/RECIRC switch LED goes off or blinks.
4) If the system has no malfunctions, the
FRESH/RECIRC switch LED is illuminated.
Does the FRESH/RECIRC
switch LED illuminate? Go to step 8 . Go to step 6 .
6 CHECK AIR MIX DOOR DRIVE SIGNAL.
1) Set the air flow control dial to FACE.
2) Place the fan speed control dial in each
position and then check each LED illumination
conditions. <Ref. to AC(diag)-12, DRIVE SIG-
NAL CHECK TABLE, OPERATION, Diagnostic
Chart for Self-Diagnosis.>
Do the LEDs illuminate in
accordance with operation sig-
nal table? Go to step 7 . Check the air mix
door actuator cir-
cuit. <Ref. to
AC(diag)-26, AIR
MIX DOOR ACTU-
ATOR, Diagnostic
Procedure for
Actuators.>
7 CHECK MODE DOOR POSITION DRIVE SIG-
NAL.
1) Press the A/C switch.
2) Place the fan speed control dial in each
position and then check each LED illumination
conditions. <Ref. to AC(diag)-12, DRIVE SIG-
NAL CHECK TABLE, OPERATION, Diagnostic
Chart for Self-Diagnosis.>
Do the LEDs illuminate in
accordance with operation sig-
nal table? Go to step 8 . Check the mode
door actuator cir-
cuit. <Ref. to
AC(diag)-24,
MODE DOOR
ACTUATOR, Diag-
nostic Procedure
for Actuators.>
8 CHECK OPERATION OF EACH ACTUATOR,
BLOWER FAN AND COMPRESSOR
CLUTCH.
1) Set the air flow control dial to B/L.
2) Turn the fan speed control dial from AUTO to
7th, and select operating modes.
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.>
• FRESH/RECIRC door
• Air flow control door
• Air mix door
• Blower fan
• A/C compressor
Does the operation of each
mode match to operating mode
table? Turn the fan speed
control dial to OFF
or the ignition
switch to OFF in
order to complete
self-diagnosis. Repair the mal-
functioning part in
accordance with
each diagnostic
chart.
Step Check Yes No