DTC B1439: Mode Door Actuator Circuit Short-Circuit

WARNING: This page is about a different variant/trim than selected.

DTC detecting condition:

Mode door actuator potentiometer circuit is shorted.

Trouble symptom:

Vent does not change.

Wiring diagram:

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

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to AIR CONDITIONER (DIAGNOSTICS) (HEV)>GENERAL DESCRIPTION>CAUTION .

CHECK CONNECTOR .
1. Check connecting condition of the A/C control panel connector and mode 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) (HEV)>DIAGNOSTIC TROUBLE CODE (DTC) .
Is DTC B1439 displayed? (Current malfunction)

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 ACTUATOR .
1. Turn the ignition switch to OFF.
2. Disconnect the connector from the mode door actuator.
3. Turn the ignition switch to ON.
4. Read the DTC of [Air Conditioner] using the Subaru Select Monitor. Ref. to AIR CONDITIONER (DIAGNOSTICS) (HEV)>DIAGNOSTIC TROUBLE CODE (DTC) .
Is DTC B1438 displayed? (Current malfunction)

Yes : Replace the mode door actuator. Ref. to AIR CONDITIONER (HEV)>MODE DOOR ACTUATOR .

No : Go to 3.
CHECK HARNESS (SHORTED BETWEEN LINES AND SHORTED TO GROUND) .
1. Turn the ignition switch to OFF.
2. Disconnect the connector from the A/C control panel.
3. Using a tester, check the continuity between terminals in mode door actuator connector and between mode door actuator connector and chassis ground.
  Connector & terminal
  
  (i176) No. 2 - (i176) No. 1:
  
  (i176) No. 2 - Chassis ground:
Is there continuity?

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

No : Replace the A/C control panel. Ref. to AIR CONDITIONER (HEV)>CONTROL PANEL .