April 5, 2026: LEMON Manuals is launched! Read the announcement.

Body Integrated Unit Power Supply And Ground Circuit

NOTE: For the DC power supply circuit, refer to "WIRING DIAGRAMS". <Ref. to POWER DISTRIBUTION .>

Fig 1: DC Power Supply Circuit - Wiring Diagrams

G10267799

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK DTC OF BODY INTEGRATED UNIT. Check DTC of body integrated unit. <Ref. to 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 BETWEEN BODY INTEGRATED UNIT AND BATTERY. Turn the ignition switch to ON. Measure the voltage between body integrated unit and chassis ground. Connector & terminal (B281) No. 3 (+) - Chassis ground (-): (B280) No. 32 (+) - Chassis ground (-): (B281) No. 6 (+) - Chassis ground (-): (B281) No. 7 (+) - Chassis ground (-): (i84) No. 6 (+) - Chassis ground (-):	Is the voltage 9 - 16 V?	Go to step 3 .	Check harness for open circuit between the body integrated unit and the battery or a blown fuse.
3 CHECK HARNESS 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 (B280) No. 1 - Chassis ground:	Is the resistance less than 1 Ω?	Go to step 4 .	Repair the open circuit of harness between the body integrated unit and chassis ground.
4 CHECK FOR POOR CONTACT.	Is there poor contact of connector?	Repair the poor contact.	Check body integrated unit.