Body Integrated Unit Power Supply And Ground Circuit

Fig 1: Body Integrated Unit Power Supply - Circuit Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSIS PROCEDURE CHART

Step	Check	Yes	No
1 CHECK DTC OF BODY INTEGRATED UNIT. Check DTC of the body integrated unit. Ref. to OPERATION , Read Diagnostic Trouble Code (DTC).	Is the DTC of power line displayed on body integrated unit?	Repair or replace it according to the DTC.	Go to step 2 .
2 CHECK HARNESS CONNECTOR BETWEEN BODY INTEGRATED UNIT AND CHASSIS GROUND. Turn the ignition switch to OFF. Measure the harness resistance between the body integrated unit and chassis ground. Connector & terminal (i84) No. 21 - Chassis ground: (B280) No. 22 - Chassis ground: (B281) No. 8 - Chassis ground: (B281) No. 9 - Chassis ground:	Is the resistance less than 1 Ω?	Go to step 3 .	Repair the open circuit of harness between the body integrated unit and chassis ground.
3 CHECK POOR CONTACT.	Is there poor contact in the connector?	Repair the poor contact.	Check the body integrated unit.