Battery Energy Control System: Wiring Diagram

WARNING: This page is about a different car, the 2015 Subaru XV Crosstrek. However, it is still accessible from the selected car via links, so may be relevant.

Hybrid system < Ref. to WIRING DIAGRAM , Hybrid Electric Vehicle System.>

Fig 1: Battery Energy Control System - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK FUSE. Check High voltage battery fuse. < Ref. to RELAY AND FUSE .>	Is the condition normal?	Go to step 2 .	Replace the fuse. When the replaced fuse is blown immediately, repair ground short circuit of harness between 12 volt auxiliary battery and the high voltage battery.
2 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the high voltage battery connector. Turn the ignition switch to ON. Using a tester, measure the voltage between the BECM connector and chassis ground. Connector & terminal (B445) No. 6 (+) - Chassis ground (-): (B445) No. 1 (+) - Chassis ground (-): (B445) No. 5 (+) - Chassis ground (-):	Is the voltage 10 - 13 V?	Go to step 3 .	Repair the open circuit of the harness between the high voltage battery connector and the fuse.
3 CHECK OTHER COMMUNICATION. Communicate with the system other than the battery energy control system using the Subaru Select Monitor.	Is the communication to other control module possible?	Go to step 4 .	Perform the "COMMUNICATION FOR INITIALIZING IMPOSSIBLE " of LAN system.
4 CHECK LAN SYSTEM. Inspect LAN system. < Ref. to PROCEDURE , Basic Diagnostic Procedure.>	Is there any fault?	Perform the inspection according to the diagnosis for LAN system.	Go to step 5 .
5 CHECK HIGH VOLTAGE BATTERY. Turn the ignition switch to OFF. Disconnect the high voltage battery connector. Connect the disconnected connectors. Communicate with the battery energy control system using the Subaru Select Monitor.	Is communication possible?	It is possible that temporary poor communication occurs.	Replace the high voltage battery. < Ref. to HIGH VOLTAGE BATTERY .>