Subaru Select Monitor: Inspection

Detecting condition: 

• Defective harness connector
• Power supply circuit malfunction
• Defective MFD
• Defective CAN communication circuit
• Defective Subaru Select Monitor

Trouble symptom: 

Communication is impossible between MFD and Subaru Select Monitor.

Wiring diagram: 

• Multi-function display (MFD) system Ref. to WIRING SYSTEM>Multi-function Display (MFD) System>WIRING DIAGRAM .
• CAN communication system Ref. to WIRING SYSTEM>CAN Communication System>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK FUSE  .

   Check the fuse. Ref. to INSTRUMENTATION/DRIVER INFO>RELAY AND FUSE .

   Is the check result OK?

   Yes: Go to  2.

   No: Replace the fuse. If the replaced fuse blows out easily, repair the ground short circuit in the harness between the battery and MFD.

2. CHECK HARNESS (OPEN CIRCUIT)  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the MFD connector.
   3. Turn the ignition switch to ON.
   4. Use a tester to measure the voltage between the combination meter connector and chassis ground.

      Connector & terminal

      (i122) No. 1 (+) - Chassis ground (-):

      (i122) No. 3 (+) - Chassis ground (-):

   Is the voltage 10 - 13 V?

   Yes: Go to  3.

   No: Repair the open circuit of the harness between MFD and fuse.

3. CHECK HARNESS (OPEN CIRCUIT)  .

   Using a tester, measure the resistance between MFD connector and chassis ground.

   Connector & terminal

   (i122) No. 2 - Chassis ground:

   Is the resistance less than 1 Ω

   Yes: Go to  4.

   No: Repair the open circuit in harness between MFD connector and chassis ground.

4. CHECK LAN SYSTEM  .

   Inspect LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

   Is the check result OK?

   Yes: Go to  5.

   No: Perform the inspection according to the diagnosis for LAN system.

5. CHECK SUBARU SELECT MONITOR COMMUNICATION  .
   1. Turn the ignition switch to ON.
   2. Check whether communication to MFD can be executed normally.

   Is the communication possible with MFD?

   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: Go to  6.

6. CHECK SUBARU SELECT MONITOR  .

   Communicate with the MFD by connecting the Subaru Select Monitor to another vehicle.

   Is the communication possible with MFD?

   Yes: Replace the MFD. Ref. to INSTRUMENTATION/DRIVER INFO>MULTI-FUNCTION DISPLAY (MFD) .

   No: Repair or replace the Subaru Select Monitor.