DTC B14E9: Intake Door Actuator Circuit Open

DTC detecting condition: 

Open circuit in the intake door actuator potentiometer circuit (open circuit in potentiometer signal line) is detected for 3 seconds or more.

Trouble symptom: 

FRESH/RECIRC does not operate.

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 B14E9 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 HARNESS. 
   1. Turn the ignition switch to ON.
   2. Using the tester, measure the voltage between terminals.

   Connector & terminal 

   (B163) No. 4 (+) - No. 6 (-):

   Is the voltage 4.5 - 5.0 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. Using a tester, check continuity between terminals.

   Connector & terminal 

   (B163) No. 1 - (i88) No. 8:

   (B163) No. 2 - (i88) No. 6:

   (B163) No. 4 - (i88) No. 10:

   (B163) No. 5 - (i88) No. 12:

   (B163) No. 6 - (i88) No. 14:

   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. Using the tester, measure the voltage between terminals.

   Connector & terminal 

   (B163) No. 5 (+) - No. 6 (-):

   Is the voltage 0.5 - 4.5 V?

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

   No:  Go to  5.

5. CHECK HARNESS (SHORTED BETWEEN LINES). 
   1. Turn the ignition switch to OFF.
   2. Using the tester, measure the resistance between terminals.

   Connector & terminal 

   (B163) No. 4 - No. 5:

   Is the resistance less than 1 Ω?

   Yes  Repair or replace the short circuit of the harness.

   No  Replace the actuator. Refer to HVAC SYSTEM (HEATER, VENTILATOR AND A/C)>FRESH/RECIRC DOOR ACTUATOR>REMOVAL .