The Windshield Glass Is Not Cleared Even When The Def Switch Is Turned To On

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, even when the DEF switch is turned to ON.

Trouble causes: 

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

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK A/C CONTROL PANEL  .
   1. Turn to READY ON.
   2. Turn the DEF switch of the A/C control panel to ON.
   3. Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Air Conditioner]. Ref. to AIR CONDITIONER (DIAGNOSTICS) (HEV)>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 AIR CONDITIONER (HEV)>CONTROL PANEL .

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) (HEV)>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) (HEV)>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 again.

   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) (HEV)>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 (ELECTRIC)) .