DTC B1621 Mode Door Actuator Potentiometer Circuit Short: Wiring Diagram

Air Conditioning System. See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: Mode Door Actuator - Wiring Diagram

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Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK CONNECTOR. Check the condition of connector connection. Read the DTC using Subaru Select Monitor.	Is B1621 displayed?	Go to step 2 .	Repair the poor contact of connector.
2 CHECK ACTUATOR. Disconnect the mode door actuator. Read the DTC using Subaru Select Monitor.	Is B1620 displayed?	Replace the mode door actuator. Refer to REMOVAL .	Go to step 3 .
3 CHECK HARNESS. Using a tester, check continuity between terminals. Connector & terminal (i176) No. 2 - No. 3: (i176) No. 3 - Chassis ground:	Is there continuity?	Repair or replace the short circuit of the harness.	Replace the A/C CM. Refer to REMOVAL .