Communication For Initializing Impossible: Wiring Diagram

WARNING: This page is about a different car, the 2016 Subaru Outback and 2016 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

CAN communication system < Ref. to appropriate wiring diagram in SYSTEM WIRING DIAGRAM article. >

Fig 1: Communication - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTICS PROCEDURE

Step	Check	Yes	No
1 CHECK SUBARU SELECT MONITOR. Connect the Subaru Select Monitor to another vehicle. Check communication condition between Subaru Select Monitor and vehicle.	Is communication performed normally?	Go to step 2 .	Subaru Select Monitor unit or diagnosis cable is faulty. Or check the fuse on the vehicle side.
2 CHECK COMMUNICATION FOR INITIALIZING ERROR. Perform the communication for initializing with each module by connecting the Subaru Select Monitor. (For systems whose module can communicate with diagnostic devices) NOTE: By performing «Confirmation of CAN bus connection to ECU (MainBus)», confirmation of minimal connection modules is possible. < Ref. to CAN BUS ECU COMMUNICATION CHECK . >	Is the communication possible with all modules?	Go to step 3 .	Perform the inspection using the check sheet of communication for initializing. < Ref. to CHECK USING THE CHECK SHEET OF COMMUNICATION FOR INITIALIZING , COMMUNICATION FOR INITIALIZING IMPOSSIBLE, Subaru Select Monitor. >
3 CHECK DATA LINK CONNECTOR. Use a tester to check for continuity in the ground circuit. Connector & terminal (B40) No. 4 - Chassis ground: (B40) No. 5 - (B134) No. 53:	Is there continuity?	Go to step 4 .	Repair or replace the open circuit.
4 CHECK DATA LINK CONNECTOR. Turn the ignition switch to ON. Using a tester, check the power supply of data link connector. Connector & terminal (B40) No. 8 (+) - Chassis ground (-): (B40) No. 16 (+) - Chassis ground (-):	Is the voltage 10 V or more?	The circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.	Check the power supply circuits to the data link connector.