DTC B14A1: Sunload Sensor Circuit Low/Open

DTC detecting condition:

Open circuit in the sunload sensor is detected for 3 seconds or more. (Displayed for current malfunction)

NOTE: When the sunload sensor check is performed indoors or in the shade, it could be diagnosed as having an open circuit. Always check the sunload sensor in direct sunlight.

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.

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 B14A1 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.
CHECK SUNLOAD SENSOR.
1. Disconnect the sunload sensor.
2. Short the connector.
3. 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 Replace the sunload sensor. Refer to HVAC SYSTEM (HEATER, VENTILATOR AND A/C)>SUNLOAD SENSOR (AUTO A/C MODEL)>REMOVAL .

No: Go to 3.
CHECK HARNESS.
1. Restore the temporary shorted lines made in step 2.
2. Turn the ignition switch to ON.
3. Using the tester, measure the voltage between terminals.
Connector & terminal

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

Is the voltage 4.5 - 5.0 V?

Yes: Go to 4.

No Repair or replace the open circuit of harness.
CHECK HARNESS (OPEN CIRCUIT).
1. Disconnect the connector from the A/C control panel.
2. Using a tester, check continuity between terminals.
Connector & terminal

(i51) No. 1 - (i88) No. 14:

(i51) No. 2 - (i88) No. 16:

Is there continuity?

Yes Replace the A/C control panel. Refer to HVAC SYSTEM (HEATER, VENTILATOR AND A/C)>CONTROL PANEL>REMOVAL .

No Repair or replace the open circuit of harness.