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 Refer to WIRING SYSTEM>COMBINATION METER SYSTEM>WIRING DIAGRAM .
• CAN communication system Refer 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. Refer to STARTING/CHARGING SYSTEMS (H4DO)>BATTERY . Refer 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. Refer 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. Refer 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 & 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. Refer to INSTRUMENTATION/DRIVER INFO>COMBINATION METER .