Battery Short Inspection (Bus "B" (Smart System Can)): Wiring Diagram

CAN communication system. See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: CAN Communication System - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

NOTE: Main wiring harness or related lines may be shorted to battery circuit, or shorted to battery circuit in one of the control modules.

Step	Check	Yes	No
1 CHECK BETWEEN MAIN WIRING HARNESSES. Turn the ignition switch to ON. Using the tester, measure the voltage between terminals. Connector & terminal (B280) No. 11 (+) - Chassis ground (-): (B280) No. 21 (+) - Chassis ground (-):	Is the voltage 5 V or less?	Currently returned to normal.	Go to step 2 .
2 CHECK CONTROL MODULE. With the tester connected, disconnect control module. Connector & terminal (B280) No. 11 (+) - Chassis ground (-): (B280) No. 21 (+) - Chassis ground (-):	Did the voltage change to 5 V or less?	Replace the control module whose voltage has changed.	Repair or replace the short circuit of the main wiring harness and related lines between body integrated unit and keyless access CM.