Air Conditioner Does Not Stop Even When The On/Off Switch Turned To Off

Trouble symptom: 

Even when the ON/OFF switch is turned to OFF, the blower fan does not turn off and the compressor does not turn off.

Trouble causes: 

• CAN communication failure
• A/C control panel failure
• Blower motor failure
• Compressor failure
• UART communication failure

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK A/C CONTROL PANEL  .
   1. Turn to READY ON.
   2. Turn the ON/OFF switch of the A/C control panel to OFF.
   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 .
      • Blower Fan Level

   Does [Blower Fan Level] indicate 0?

   Yes  : Go to  2.

   No  : Replace the A/C control panel. Ref. to AIR CONDITIONER (HEV)>CONTROL PANEL .

2. CHECK BLOWER MOTOR  .

   With the ON/OFF switch turned to OFF, check the blower motor operation.

   Is the blower motor stopped?

   Yes  : Go to  3.

   No  : Ref. to AIR CONDITIONER (DIAGNOSTICS) (HEV)>DIAGNOSTICS WITH PHENOMENON>INSPECTION>AIR GOES OUT OF CONTROL. (BLOWER MOTOR ROTATES AT HIGH SPEED.) .

3. CHECK COMPRESSOR  .

   With the ON/OFF switch turned to OFF, check the compressor operation.

   Is the compressor stopped?

   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)) .