DTC B14A2: Sunload Sensor Circuit Short-Circuit

DTC detecting condition: 

Short circuit in the sunload sensor is detected for 3 seconds or more.

Trouble symptom: 

Operation is performed as no sunload.

Wiring diagram: 

Air conditioning system Refer to WIRING SYSTEM>AIR CONDITIONING SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK CONNECTOR. 
   1. Check the condition of connector connection.
   2. Read the DTC using Subaru Select Monitor. Refer to HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B14A2 displayed?

   Yes:  Go to  2.

   No  Even if DTC is displayed, 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.
2. CHECK SUNLOAD SENSOR. 
   1. Disconnect the sunload sensor.
   2. Read the DTC using Subaru Select Monitor. Refer to HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B14A1 displayed?

   Yes  Replace the sunload sensor. Refer to HVAC SYSTEM (HEATER, VENTILATOR AND A/C)>SUNLOAD SENSOR (AUTO A/C MODEL)>REMOVAL .

   No:  Go to  3.

3. CHECK HARNESS. 
   1. Turn the ignition switch to ON.
   2. Using the tester, measure the voltage between terminals.

   Connector & terminal 

   (i51) No. 2 (+) - No. 1 (-):

   Is the voltage 4.5 - 5.0 V?

   Yes  Check the connection of the sunload sensor circuit.

   No:  Go to  4.

4. CHECK HARNESS (SHORTED BETWEEN LINES). 
   1. Disconnect the connector from the A/C control panel.
   2. Using a tester, check continuity between terminals.

   Connector & terminal 

   (i51) No. 1 - No. 2:

   Is there continuity?

   Yes  Repair or replace the short circuit of the harness.

   No  Replace the A/C control panel. Refer to HVAC SYSTEM (HEATER, VENTILATOR AND A/C)>CONTROL PANEL>REMOVAL .