Diagnostic Procedure For Subaru Select Monitor Communication: Inspection: Notes

Diagnosis:

Subaru Select Monitor communication line is open or shorted.

Trouble symptom:

Not communicable with Subaru Select Monitor.

Wiring diagram:

CAN communication system Ref. to WIRING SYSTEM>CAN COMMUNICATION SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

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?

YES : Go to 2 .

No : Subaru Select Monitor unit or diagnosis cable is faulty. Or check the fuse on the vehicle side.
CHECK DATA LINK CONNECTOR .
Use a tester to check for continuity in the ground circuit.

Connector and terminal

(i288) No. 4 - Chassis ground:

(i288) No. 5 - (B134) No. 50:

Is there continuity?

Yes : Go to 3 .

No : Repair or replace the open circuit.
CHECK DATA LINK CONNECTOR .
1. Turn the ignition switch to ON.
2. Using a tester, check the power supply of data link connector.
Connector and terminal

(i288) No. 8 (+) - Chassis ground (-):

(i288) No. 16 (+) - Chassis ground (-):

Is the voltage 10 V or more?

Yes : Go to 4 .

No : Check the power supply circuits to the data link connector.
CHECK COMMUNICATION FOR INITIALIZING ERROR .
1. Turn the ignition switch to ON.
2. 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 [CAN bus connected ECU], confirmation of minimal connection modules is possible. Ref. to LAN SYSTEM (DIAGNOSTICS)>CAN Bus Check .

Is the communication possible with all modules?

Yes : 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.

No : Perform the inspection using the check sheet of communication for initializing. Ref. to LAN SYSTEM (DIAGNOSTICS)>Diagnostic Procedure for Subaru Select Monitor Communication>INSPECTION>CHECK USING THE CHECK SHEET OF COMMUNICATION FOR INITIALIZING .