DTC B1644 Refrigerant Not Sealed Drive Error: Wiring Diagram

Air Conditioning System. See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: Air Conditioning System - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK AMOUNT OF REFRIGERANT. Check the refrigerant pressure and filling amount. Refer to PROCEDURE .	Is the filling amount a standard value?	Check the refrigerant pressure sensor or refrigerant flow sensor for defect.	Replace the compressor. Refer to REMOVAL .