Communication For Initializing Impossible

When communication with the navigation unit is impossible

Detecting condition:

Defective harness connector
Power supply circuit malfunction
Infotainment system module malfunction
Defective CAN communication circuit
Defective Subaru Select Monitor

Trouble symptom:

Communication is impossible between the infotainment system module and Subaru Select Monitor.

Wiring diagram:

NOTE: For the coupling connector, refer to "WIRING SYSTEM".

Audio system Ref. to WIRING DIAGRAM , Audio System.
Navigation system Ref. to WIRING DIAGRAM , Navigation System.

Fig 1: Navigation System Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK OTHER COMMUNICATION. Communicate with the system other than the infotainment system using the Subaru Select Monitor.	Is the communication to other control module possible?	Go to step 2 .	Perform the "Communication for Initializing Impossible" of LAN system.
2 CHECK LAN SYSTEM. Inspect LAN system. Ref. to PROCEDURE , Basic Diagnostic Procedure.	Is the check result OK?	Go to step 3 .	Perform the inspection according to the diagnosis for LAN system.
3 CHECK FUSE. Check the fuse of the infotainment system. Ref. to LOCATION , Relay and Fuse.	Is the check result OK?	Go to step 4 .	Replace the fuse. If the replaced fuse blows out easily, repair the ground short circuit of the harness between the battery and audio (7-inch display) connector, or between the navigation unit connector.
4 CHECK HARNESS. Turn off the audio (7-inch display) or navigation unit. Disconnect the audio (7-inch display) connector or navigation unit connector. Turn the ignition switch to ON. Using the tester, measure the voltage between audio (7-inch display) connector or navigation unit connector and chassis ground. Connector & terminal (i85) No. 4 (+) - Chassis ground (-): (without power amplifier) (i35) No. 4 (+) - Chassis ground (-): (with power amplifier) (i87) No. 1 (+) - Chassis ground (-):	Is the voltage 10 - 13 V?	Go to step 5 .	Repair the open circuit of harness between audio (7-inch display) connector or navigation unit connector and fuse.
5 CHECK INFOTAINMENT SYSTEM MODULE. Turn the ignition switch to OFF. Connect the audio (7-inch display) connector or navigation unit connector. Perform the communication with the infotainment system.	Is communication possible?	It is possible that temporary poor communication occurs.	Replace the audio (7-inch display) or navigation unit. Ref. to AUDIO . Ref. to NAVIGATION BODY .