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HOMESERVICE MANUALSSUBARU2016LEGACY 2.5IREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESLAN COMMUNICATION SYSTEM (DIAGNOSTICS)SUBARU SELECT MONITORCOMMUNICATION FOR INITIALIZING IMPOSSIBLEWIRING DIAGRAM
2016 Subaru Legacy 2.5i

Communication For Initializing Impossible: Wiring Diagram

2016 Subaru Legacy 2.5iSECTION Wiring Diagram

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

Fig 1: Communication - Wiring Diagram
G10273226Courtesy of SUBARU OF AMERICA, INC.
DIAGNOSTICS PROCEDURE

Step Check Yes No
1 CHECK SUBARU SELECT MONITOR. 
  1. Connect the Subaru Select Monitor to another vehicle.
  2. 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. 
  1. Turn the ignition switch to ON.
  2. 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.
RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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