Cold Air Does Not Come Out Even When The A/C Switch Is Pressed. The Glass Cannot Be Defogged (Compressor Does Not Operate (Variable)): Wiring Diagram

Air Conditioning System. See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: Solenoid Compressor - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK A/C CONTROL PANEL. Leave the vehicle under the condition at ambient temperature of 15°C (59°F) or more. Turn the ignition switch to ON. Set the fan switch to maximum position. Press the A/C switch.	Is "A/C" displayed on the A/C control panel? Or does the A/C switch indicator illuminate?	Go to step 2 .	Replace the A/C control panel. Refer to REMOVAL .
2 CHECK VARIABLE FLOW CHANGE SOLENOID DUTY VALUE. Using the Subaru Select Monitor, check "Variable Flow Change Solenoid Duty" of the current data from the A/C diagnosis.	Does the data indicate the value greater than zero?	Go to step 7 .	Go to step 3 .
3 CHECK EVAPORATOR SENSOR. Using the Subaru Select Monitor, check "Evaporator Temp." of the current data from the A/C diagnosis.	Does the data indicate -0.5 degree or more?	Go to step 5 .	Go to step 4 .
4 CHECK EVAPORATOR SENSOR. Check the evaporator sensor. Refer to INSPECTION .	Is the sensor normal?	Go to step 5 .	Replace the evaporator sensor.
5 CHECK REFRIGERANT PRESSURE SENSOR. Using the Subaru Select Monitor, check "Refrigerant Pressure" of the current data from the A/C diagnosis.	Does the data indicate 0.21 Mpa - 3.03 Mpa?	Go to step 7 .	Go to step 6 .
6 CHECK AMOUNT OF REFRIGERANT PRESSURE. Check the refrigerant pressure. Refer to CHECK REFRIGERANT GAS PRESSURE .	Is the refrigerant pressure normal?	Go to step 7 .	Perform repair according to refrigerant pressure inspection.
7 CHECK FLOW SENSOR CIRCUIT. Turn the ignition switch to ON. Wait at least 1 seconds. Read the DTC using Subaru Select Monitor.	Are B1641 and B1642 displayed?	Perform the diagnosis according to DTC.	Go to step 8 .
8 CHECK VARIABLE SOLENOID CIRCUIT. Start the engine. Turn the A/C switch to ON. Set the fan switch to maximum position. Set the temperature control switch to LO, and wait for 30 seconds or more. Read the DTC using Subaru Select Monitor.	Is B1643 displayed?	Perform the diagnosis according to DTC.	Replace the compressor. Refer to REMOVAL .