Diagnostic Procedure for Subaru Select Monitor Communication: Inspection

Detecting condition: 

• Defective harness
• Power supply circuit malfunction
• Defective keyless access control module
• Defective CAN communication circuit
• Defective Subaru Select Monitor

Trouble symptom: 

Not communicable with Subaru Select Monitor.

Wiring diagram: 

• Keyless access with push button start system Ref. to WIRING SYSTEM (IMPREZA MODEL)>KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (HEV))>KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM>WIRING DIAGRAM .
• CAN communication system Ref. to WIRING SYSTEM (IMPREZA MODEL)>CAN COMMUNICATION SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>CAN COMMUNICATION SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (HEV))>CAN COMMUNICATION SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK POWER SUPPLY CIRCUIT  .

   Connect the interface for Subaru Select Monitor to the data link connector.

   Does the interface for Subaru Select Monitor turn on?

   Yes:  Go to  4.

   No:  Go to  2.

2. CHECK POWER SUPPLY CIRCUIT  .
   1. Turn the ignition switch to ON.
   2. Using the tester, measure the voltage between data link connector and chassis ground.

      Connector & terminal 

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

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

   Is the voltage 10 V or more?

   Yes:  Go to  3.

   No:  Repair the power supply circuit.

   NOTE:

   In this case, repair the following item: 

   • Open or ground short circuit of harness between battery and data link connector 
   • Blown out of fuse 
3. CHECK HARNESS BETWEEN DATA LINK CONNECTOR AND CHASSIS GROUND (OPEN)  .
   1. Turn the ignition switch to OFF.
   2. Using the tester, measure the resistance between data link connector and chassis ground.

      Connector & terminal 

      (i288) No. 4 - Chassis ground:

      (i288) No. 5 - Chassis ground:

   Is the resistance less than 5 Ω?

   Yes:  Check for poor contact of the data link connector, and repair a fault, if any. When no fault is found, Go to  4.

   No:  Repair the harness and connector.

4. CHECK SUBARU SELECT MONITOR  .
   1. Connect the Subaru Select Monitor to a normal vehicle.
   2. Start the engine (except for hybrid model) or hybrid system (for hybrid model) and perform communication between the Subaru Select Monitor and vehicle.

   Is communication possible?

   Yes:  Go to  5.

   No:  Use another Subaru Select Monitor because the CAN communication circuit of the Subaru Select Monitor is faulty.

5. CHECK LAN SYSTEM  .

   Perform the diagnosis for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS) (EXCEPT FOR HEV)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE . Ref. to LAN SYSTEM (DIAGNOSTICS) (HEV)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

   Is the check result OK?

   Yes:  Go to  6.

   No:  Perform the diagnosis for LAN system.

6. CHECK CONNECTOR  .

   Check poor contact of keyless access control module connector, data link connector and coupling connector.

   Is the check result OK?

   Yes:  Go to  7.

   No:  Repair the connector.

7. CHECK FUSE  .
   1. Turn the ignition switch to OFF.
   2. Check the fuse of keyless access control module. Ref. to SECURITY AND LOCKS>RELAY AND FUSE .

   Is the check result OK?

   Yes:  Go to  8.

   No:  Replace the fuse. If the replaced fuse has blown out immediately, repair the short circuit to ground in harness between keyless access control module and fuse.

8. CHECK KEYLESS ACCESS CONTROL MODULE CONNECTOR POWER SUPPLY CIRCUIT (OPEN)  .
   1. Disconnect the keyless access control module connector.
   2. Measure the voltage between keyless access control module connector and chassis ground.

      Connector & terminal 

      (i75) No. 4 (+) - Chassis ground (-):

      (i75) No. 1 (+) - Chassis ground (-):

   Is the voltage 10 V or more?

   Yes:  Go to  9.

   No:  Check for open or short circuit in the harness between keyless access control module and fuse.

9. CHECK GROUND CIRCUIT OF KEYLESS ACCESS CONTROL MODULE (OPEN)  .

   Measure the resistance in harness between keyless access control module connector and chassis ground.

   Connector & terminal 

   (i75) No. 20 - Chassis ground:

   (i241) No. 17 - Chassis ground:

   Is the resistance less than 1 Ω?

   Yes:  Check the connection between the data link connector and Subaru Select Monitor.

   No:  Repair the harness for ground line.