Diagnostic Procedure for Subaru Select Monitor Communication: Inspection

Trouble symptom: 

Cannot communicate with [Plug-in Battery Charger].

Detecting condition: 

• Defective Wire harness connector
• Power supply circuit malfunction
• Electric vehicle charger assembly malfunctioning
• Defective CAN communication circuit
• Defective Subaru Select Monitor

Wiring diagram: 

Charging system Ref. to WIRING SYSTEM (CROSSTREK MODEL (HEV))>CHARGING SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK FUSE  .
   1. Turn the ignition switch to OFF.
   2. Check the fuse. Ref. to HYBRID ELECTRIC VEHICLE>RELAY AND FUSE .

   Is there any fault?

   Yes  : Replace the fuse. If the replaced fuse blows out easily, repair the short circuit to ground in the Wire harness between the fuse and the - Electric vehicle charger assembly.

   No  : Go to  2.

2. CHECK POWER SUPPLY CIRCUIT (OPEN)  .
   1. Disconnect the Electric vehicle charger assembly connector.
   2. Using a tester, measure the voltage between Electric vehicle charger assembly connector and chassis ground.

      Connector & terminal 

      (R516) No. 1 (+) - Chassis ground (-):

   Is the voltage 10 V or more?

   Yes  : Go to  3.

   No  : Repair the open circuit in Wire harness between the fuse and the Electric vehicle charger assembly.

3. CHECK GROUND CIRCUIT (OPEN)  .
   1. Turn the ignition switch to OFF.
   2. Using a tester, measure the resistance between the Electric vehicle charger assembly case and chassis ground.

      Connector & terminal 

      Electric vehicle charger assembly unit case - Chassis ground:

   Is the resistance less than 1 Ω?

   Yes  : Go to  4.

   No  : Tighten the Electric vehicle charger assembly connecting bolts.

4. CHECK LAN SYSTEM  .
   1. Connect the Electric vehicle charger assembly connector.
   2. Inspect LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS) (HEV)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

   Is there any fault?

   Yes  : Perform the inspection according to the diagnosis for LAN system.

   No  : Go to  5.

5. CHECK Electric vehicle charger assembly  .

   Communicate with [Plug-in Battery Charger].

   Is communication possible?

   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, or temporary open or short circuit of the Wire harness may be the cause.

   No  : Replace Electric vehicle charger assembly. Ref. to HYBRID ELECTRIC VEHICLE>ELECTRIC VEHICLE CHARGER .