Battery Short Inspection (Bus "A" (Main-Can)): Wiring Diagram

CAN communication system. See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: CAN Communication System - Wiring Diagram (Main-CAN)

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 RELATED LINES AND MAIN WIRING HARNESS. Turn the ignition switch to ON. Using the tester, measure the voltage between terminals. Connector & terminal (B40) No. 6 (+) - Chassis ground (-): (B40) No. 14 (+) - 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. NOTE: Disconnect the body integrated unit at the end. Connector & terminal (B40) No. 6 (+) - Chassis ground (-): (B40) No. 14 (+) - Chassis ground (-):	Did the voltage change to 5 V or less?	Replace the control module whose voltage has changed. When the value changed at disconnecting the body integrated unit, Go to step 3 .	Repair or replace the short circuit of the main wiring harness and related lines between body integrated unit and VDC CM.
3 CHECK BETWEEN MAIN WIRING HARNESSES. Using the tester, measure the voltage between terminals. Connector & terminal (i84) No. 27 (+) - Chassis ground (-): (i84) No. 35 (+) - Chassis ground (-):	Is the voltage 1 V or less?	Replace the body integrated unit. Refer to REMOVAL .	Repair or replace the short circuit of the main wiring harness and related lines between body integrated unit and ECM.