DTC B1104 Acc Power Failure: Wiring Diagram

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: ACC Power Supply Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE CHART

Step	Check	Yes	No
1 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. < Ref. to OPERATION , Subaru Select Monitor. >	Is B1104 current malfunction?	Go to step 2.	Go to step 5 .
2 CHECK DTC. Turn the ignition switch to OFF. Disconnect the connector from body integrated unit and reconnect. Turn the ignition switch to ON. Wait approx. 2 minutes. Read the DTC of body integrated unit using Subaru Select Monitor.	Is B1104 current malfunction?	Go to step 3.	Go to step 5 .
3 CHECK FUSE. Turn the ignition switch to OFF. Check the fuse.	Is the fuse OK?	Go to step 4.	Replace the defective fuse.
4 CHECK HARNESS. Disconnect the body integrated unit connector (B280). Turn the ignition switch to ON. Measure the voltage between body integrated unit connector and chassis ground using tester. Connector & terminal (B280) No. 7 (+) - Chassis ground (-):	Is the voltage 8.5 - 16.5 V?	Replace the body integrated unit. < Ref. to REMOVAL , Body Integrated Unit. >	Repair or replace the open or shorted circuit between body integrated unit and fuse.
5 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect the body integrated unit connector (B280).	Is there poor contact of connector?	Repair or replace the poor contact of connector.	A temporary change of voltage occurred.