Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b1443 mode door actuator circuit stuck

Subaru Legacy BN/BS (2015-2019) Service Manual / Hvac system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b1443 mode door actuator circuit stuck

DTC DETECTING CONDITION:

Mode door actuator is locked.

TROUBLE SYMPTOM:

Vent does not change.

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 mode door actuator connector. 2) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is B1443 displayed-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1443 MODE DOOR ACTUATOR CIRCUIT STUCK	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. Using the Subaru Select Monitor, change the setting of «Mode Door Actuator Opening Angle Target» from the A/C diagnosis and perform the system operation check. System Operation Check Mode	Did the mode door actuator move to the specified target opening angle-	Mode door actuator circuit is normal.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1443 MODE DOOR ACTUATOR CIRCUIT STUCK
3.CHECK HARNESS. 1) Turn the ignition switch to ON. 2) Using the tester, measure the voltage between terminals. Connector & terminal (i176) No. 2 (+) — No. 1 (−):	Is the voltage 4.5 — 5.0 V-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1443 MODE DOOR ACTUATOR CIRCUIT STUCK	Repair or replace the open, short circuit of the harness.
4.CHECK HARNESS (OPEN CIRCUIT). 1) Disconnect the connector from A/C CM. 2) Using a tester, check continuity between terminals. Connector & terminal (i176) No. 3 — (i80) No. 12: (i176) No. 1 — (i181) No. 18: (i176) No. 2 — (i80) No. 6: (i176) No. 4 — (i80) No. 18: (i176) No. 5 — (i80) No. 7:	Is there continuity-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1443 MODE DOOR ACTUATOR CIRCUIT STUCK	Repair or replace the open circuit of harness.
5.CHECK MODE DOOR ACTUATOR. Check the mode door actuator parts. Mode Door Actuator > INSPECTION	Is the mode door actuator OK-	Replace the A/C CM. Control Unit > REMOVAL	Replace the mode door actuator. Mode Door Actuator > REMOVAL

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Other materials:

Caution
1. AIRBAG SYSTEMAirbag system wiring harness is routed near the cruise control command switch.CAUTION:• Do not use the electrical test equipment on the airbag system wiring harnesses and connector circuits.• Be careful not to damage the airbag system wiring harness when servicing the cru ...