Check Each Connection

With the main power OFF, press and hold the button (c) for 3 seconds or more while pressing the buttons (a) and (b) simultaneously.

Fig 1: Identifying Buttons
Courtesy of SUBARU OF AMERICA, INC.

NOTE: Pressing the button (a) for 3 seconds or more, or turning the ignition switch from ACC OFF to ON position can exit the diagnostic mode.
Line Diag screen is displayed.
Check the connection status for each item listed in "Connectivity Check" displayed on the left of the screen.

Fig 2: Display - Connectivity And Vehicle Signal Check Screen
Courtesy of SUBARU OF AMERICA, INC.

OK: Each connection device is connected properly.

NG: No connection or abnormal connection is detected.
Check the connection status of the connector. If there are no problems, the connection device or unit could be faulty.