DTC B1643 Variable Flow Change Solenoid Duty Circuit Abnormal: Wiring Diagram

Air Conditioning System. See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: Variable Solenoid Valve Compressor - Wiring Diagram

G06653046

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK CONNECTOR. Check the connecting condition of connectors (B506), (B36), (i181) and (B479).	Is there poor contact?	Repair the poor contact of connector.	Go to step 2 .
2 ACTIVE TEST. Attach the manifold gauge. Using the Subaru Select Monitor, change the setting of "Variable Flow Change Sol Duty Setting" from the A/C diagnosis and perform the active test.	Did the actuator operate to the specified target, and the pressure change?	Variable flow change solenoid circuit is normal.	Go to step 3 .
3 CHECK VARIABLE FLOW CHANGE SOLENOID. Disconnect the variable flow change solenoid connector. Using a tester, measure the resistance between terminals of the solenoid. Connector & terminal (B506) No. 1 - No. 2:	Is the resistance 10 - 12 Ω?	Go to step 4 .	Replace the compressor. Refer to REMOVAL .
4 CHECK HARNESS. Disconnect the A/C CM connector. Using a tester, check for continuity between the harness terminals. Connector & terminal (B506) No. 2 - (i181) No. 2: (B506) No. 1 - Chassis ground:	Is there continuity?	Go to step 5 .	Repair or replace the open circuit of harness.
5 CHECK HARNESS. Using a tester, check for continuity between the harness terminals. Connector & terminal (B506) No. 2 - Chassis ground: (B506) No. 1 - (B506) No. 2:	Is there continuity?	Repair or replace the short circuit of the harness.	Replace the A/C CM. Refer to REMOVAL .