Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b1449 rear vent door actuator circuit short-circuit

Subaru Legacy BN/BS (2015-2019) Service Manual / Hvac system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b1449 rear vent door actuator circuit short-circuit

DTC DETECTING CONDITION:

Rear vent actuator potentiometer circuit is shorted.

TROUBLE SYMPTOM:

Unable to control the rear vent temperature.

WIRING DIAGRAM:

Air conditioning system Air Conditioning System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK CONNECTOR. 1) Check connecting condition of the A/C CM connector and rear vent actuator connector. 2) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is B1449 displayed-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1449 REAR VENT DOOR ACTUATOR CIRCUIT SHORT-CIRCUIT	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 REAR VENT ACTUATOR. 1) Disconnect the rear vent actuator. 2) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is B1448 displayed-	Replace the rear vent actuator. Rear Vent Door Actuator > REMOVAL	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1449 REAR VENT DOOR ACTUATOR CIRCUIT SHORT-CIRCUIT
3.CHECK HARNESS (SHORTED BETWEEN LINES AND SHORTED TO GROUND). Using a tester, check continuity between terminals. Connector & terminal (i177) No. 5 — (i177) No. 1: (i177) No. 5 — Chassis ground:	Is there continuity-	Repair or replace the short circuit of the harness.	Replace the A/C CM. Control Unit > REMOVAL

Dtc b144a rear vent door actuator circuit stuck

DTC DETECTING CONDITION:Rear vent actuator is locked.TROUBLE SYMPTOM:Unable to control the rear vent temperature.WIRING DIAGRAM:Air conditioning system Air Conditioning System > WIRING DIAGRAMSTEPCHE ...

Dtc b1448 rear vent door actuator circuit open

DTC DETECTING CONDITION:Rear vent actuator potentiometer circuit is open.TROUBLE SYMPTOM:Unable to control the rear vent temperature.WIRING DIAGRAM:Air conditioning system Air Conditioning System > W ...

Other materials:

Installation
CAUTION:When the ECM of model with immobilizer has been replaced, be sure to perform the registration of immobilizer system. (Refer to the “REGISTRATION MANUAL FOR IMMOBILIZER”.)NOTE:When replacing the ECM, be careful not to use the ECM of wrong specification to avoid any damage on the f ...