Diagnostic Procedure for Subaru Select Monitor Communication: Inspection

Detecting condition: 

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

Trouble symptom: 

Communication is impossible between the cockpit control module and the Subaru Select Monitor.

Wiring diagram: 

• Audio and navigation system Ref. to WIRING SYSTEM>AUDIO AND NAVIGATION 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  .

   Check the ignition switch.

   Is the ignition switch ON?

   Yes:  Go to  2.

   No:  Turn the ignition switch to ON, and select the [Cockpit Control] 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>INSPECTION .

   Is the voltage 10 V or more?

   Yes:  Go to  3.

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

3. CHECK BATTERY TERMINAL  .

   Check the battery terminal for poor contact.

   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 cockpit control module 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 COCKPIT CONTROL MODULE  .
   1. Turn the ignition switch to ON.
   2. Communicate with [Cockpit Control] 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. Using the tester, measure the ignition power supply voltage between cockpit control module connector and chassis ground.

      Connector & terminal 

      (i102) No. 3 (+) - Chassis ground (-):

      (i102) No. 4 (+) - Chassis ground (-):

      (i102) No. 9 (+) - Chassis ground (-):

   Is the voltage 10 - 16 V?

   Yes:  Go to  9.

   No:  Repair the open circuit in the harness between the cockpit control module and the battery.

9. CHECK CONNECTOR  .
   1. Turn the ignition switch to OFF.
   2. Check for poor contact of connector.

   Is there poor contact of cockpit control module power supply, ground circuit and data link connector?

   Yes:  Repair the connector.

   No:  Replace the cockpit control module. Ref. to ENTERTAINMENT & MONITORING>COCKPIT DISPLAY .