DTC B14EA: Intake Door Actuator Circuit Short-Circuit

DTC detecting condition: 

Intake door actuator potentiometer circuit is shorted.

Trouble symptom: 

FRESH/RECIRC does not operate.

Wiring diagram: 

Air conditioning system Ref. to WIRING SYSTEM (IMPREZA MODEL)>AIR CONDITIONING SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>AIR CONDITIONING SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK CONNECTOR  .
   1. Check connecting condition of the A/C control panel and intake door actuator connector.
   2. Turn the ignition switch to ON.
   3. Read the DTC of [Air Conditioner] using the Subaru Select Monitor. Ref. to AIR CONDITIONER (DIAGNOSTICS) (EXCEPT FOR HEV)>DIAGNOSTIC TROUBLE CODE (DTC) .

      Is DTC B14EA 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 ACTUATOR  .

   Measure the voltage between intake door actuator connector terminals using a tester.

   Connector and terminal 

   (i186) No. 3 (+) - (i186) No. 1 (-):

   Is the voltage 4.5 - 5.5 V?

   Yes:  Go to  3.

   No:  Repair or replace the open circuit of harness.

3. CHECK HARNESS (OPEN CIRCUIT)  .
   1. Turn the ignition switch to OFF.
   2. Check the continuity between terminals in intake door actuator connector using a tester.

      Connector and terminal 

      (i186) No. 1 - (i88) No. 30:

      (i186) No. 2 - (i88) No. 32:

      (i186) No. 3 - (i88) No. 16:

      Is there continuity?

      Yes:  Go to  4.

      No:  Repair or replace the open circuit of harness.

4. CHECK ACTUATOR  .
   1. Turn the ignition switch to ON.
   2. Measure the voltage between intake door actuator connector terminals using a tester.

      Connector and terminal 

      (i186) No. 2 (+) - (i186) No. 1 (-):

      Is the voltage 0.5 - 4.5 V?

      Yes:  Replace the A/C control panel. Ref. to AIR CONDITIONER (EXCEPT FOR HEV)>CONTROL PANEL .

      No:  Go to  5.

5. CHECK HARNESS (SHORTED BETWEEN LINES)  .
   1. Turn the ignition switch to OFF.
   2. Measure the resistance between intake door actuator connector terminals using a tester.

      Connector and terminal 

      (i186) No. 2 - (i186) No. 1:

      Is the resistance less than 1 Ω?

      Yes:  Repair or replace the short circuit of the harness.

      No:  Replace the intake door actuator. Ref. to AIR CONDITIONER (EXCEPT FOR HEV)>FRESH/RECIRC DOOR ACTUATOR .