Diagnostic Procedure For Subaru Select Monitor Communication: Inspection

Trouble symptom: 

Cannot communicate with [Combination Meter].

Detecting condition: 

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

Wiring diagram: 

• Combination meter system Ref. to WIRING SYSTEM>COMBINATION METER SYSTEM>WIRING DIAGRAM .
• CAN communication system Ref. to WIRING SYSTEM>CAN COMMUNICATION SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK IGNITION SWITCH  .

   Is the ignition switch ON?

   Yes:  Go to  2 .

   No:  Turn the ignition switch to ON, and select the [Power Steering] using the Subaru Select Monitor.

2. CHECK BATTERY  .
   1. Turn the ignition switch to OFF.
   2. Measure the battery voltage. Ref. to STARTING/CHARGING SYSTEMS (H4DO)>BATTERY . Ref. to STARTING/CHARGING SYSTEMS (H4DOTC)>BATTERY .

   Is the voltage 11 V or more?

   Yes:  Go to  3 .

   No:  Charge or replace the battery. And then, restart the Subaru Select Monitor.

3. CHECK BATTERY TERMINAL  .

   Is there poor contact at battery terminal?

   Yes:  Replace or tighten the battery terminal.

   No:  Go to  4 .

4. CHECK CONNECTOR  .

   Check the connecting condition of the combination meter connector.

   Is the connector connected securely?

   Yes:  Go to  5 .

   No:  Connect the connector securely. Or repair the poor contact of connector.

5. CHECK LAN SYSTEM  .

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

   Is the check result OK?

   Yes:  Go to  6 .

   No:  Perform the inspection according to the diagnosis for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

6. CHECK COMBINATION METER  .

   Communicate with [Combination Meter] using the Subaru Select Monitor.

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

   No:  Go to  7 .

7. CHECK SUBARU SELECT MONITOR COMMUNICATION  .

   Connect the Subaru Select Monitor to another vehicle to check whether the communication for initializing can be executed normally.

   Does the Subaru Select Monitor communicate normally?

   Yes:  Go to  8 .

   No:  Repair or replace the Subaru Select Monitor.

8. CHECK POWER SUPPLY CIRCUIT  .
   1. Turn the ignition switch to ON. (Engine OFF)
   2. Use a tester to measure the ignition power supply voltage between the combination meter connector and chassis ground.

      Connector and terminal 

      (i97) No. 1 (+) - Chassis ground (-):

      (i97) No. 2 (+) - Chassis ground (-):

   Is the voltage 9 - 16 V?

   Yes:  Go to  9 .

   No:  Repair the open circuit of harness between combination meter and battery.

9. CHECK CONNECTOR  .

   Check for poor contact of connector.

   Is there poor contact in the combination meter power supply, ground circuit and data link connector?

   Yes:  Repair the connector.

   No:  Replace the combination meter. Ref. to INSTRUMENTATION/DRIVER INFO>COMBINATION METER .