Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b1448 rear vent door actuator circuit open

Subaru Legacy BN/BS (2015-2019) Service Manual / Hvac system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / 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 > 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 B1448 displayed-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1448 REAR VENT DOOR ACTUATOR CIRCUIT OPEN	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) Short No. 1 and No. 5 of (i177) connector. 3) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is B1449 displayed-	Replace the rear vent actuator. Rear Vent Door Actuator > REMOVAL	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1448 REAR VENT DOOR ACTUATOR CIRCUIT OPEN
3.CHECK HARNESS. 1) Restore the temporary shorted lines made in step 2. 2) Turn the ignition switch to ON. 3) Using the tester, measure the voltage between terminals. Connector & terminal (i177) No. 3 (+) — No. 1 (−):	Is the voltage 4.5 — 5.0 V-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1448 REAR VENT DOOR ACTUATOR CIRCUIT OPEN	Repair or replace the open circuit of harness.
4.CHECK HARNESS (OPEN CIRCUIT). Using a tester, check continuity between terminals. Connector & terminal (i177) No. 3 — (i80) No. 12: (i177) No. 1 — (i181) No. 18: (i177) No. 5 — (i80) No. 15:	Is there continuity-	Replace the A/C CM. Control Unit > REMOVAL	Repair or replace the open circuit of harness.

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