The Windshield Glass Is Not Cleared Even When The Def Switch Is Pressed

Trouble symptom: 

Defroster indicator does not illuminate, outlet opening does not switch to DEF, compressor does not switch to ON, and inlet opening does not switch to FRESH, when pressing the DEF switch.

Trouble causes: 

• CAN communication failure
• A/C control panel failure
• Mode door actuator failure
• Compressor failure
• Intake door actuator failure

1. CHECK A/C CONTROL PANEL. 
   1. Turn the ignition switch to ON.
   2. Press the DEF switch of the A/C control panel.
   3. Using Subaru Select Monitor, check the following data of the data monitor. Ref. to AIR CONDITIONER(DIAGNOSTICS)>Data Monitor .
      • Mode Door Actuator Position Target
      • Fresh/Recircle Air Door Actuator Position Target

   Does [Mode Door Actuator Position Target] indicate 100%, and [Fresh/Recircle Air Door Actuator Position Target] indicate 100%?

   • Yes  : Go to 2. 
   • No  : Replace the A/C control panel. Ref. to HVAC SYSTEM (HEATER, VENTILATOR AND A/C)>Control Panel>REMOVAL .
2. CHECK MODE DOOR ACTUATOR. 

   With the DEF switch ON, check the mode door operation.

   Does the air come out from the DEF outlet opening?

   • Yes  : Go to 3. 
   • No  : Ref. to AIR CONDITIONER(DIAGNOSTICS)>Diagnostics with Phenomenon>INSPECTION>UNABLE TO SWITCH VENTS .
3. CHECK INTAKE DOOR ACTUATOR. 

   With the DEF switch ON, check the FRESH/RECIRC door operation.

   Is FRESH/RECIRC switch turned to "FRESH"?

   • Yes  : Go to 4. 
   • No  : Ref. to AIR CONDITIONER(DIAGNOSTICS)>Diagnostics with Phenomenon>INSPECTION>UNABLE TO SWITCH SUCTION VENTS .
4. CHECK COMPRESSOR. 

   With the DEF switch ON, check the compressor operation.

   Does the compressor operate?

   • Yes  : The circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis.
     NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
   • No  : Ref. to AIR CONDITIONER(DIAGNOSTICS)>Diagnostics with Phenomenon>INSPECTION>COLD AIR DOES NOT COME OUT EVEN WHEN THE A/C SWITCH IS PRESSED. THE GLASS CANNOT BE DEFOGGED. (COMPRESSOR DOES NOT OPERATE.).