Power Will Not Turn On

Probable cause: 

Power supply circuit malfunction, unit body malfunction

Wiring diagram: 

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

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK CONNECTOR CONNECTION  .

   Check that the connector is connected to the unit.

   Is the check result OK?

   Yes:  Go to  2 .

   No:  Connect the connector.

2. CHECK CONNECTOR  .

   Check for poor contact of connectors or terminals.

   Is the check result OK?

   Yes:  Go to  3 .

   No:  Repair or replace the harness.

3. CHECK POWER SUPPLY VOLTAGE  .
   1. Disconnect the connector (i102) of the cockpit control module.
   2. Turn the ignition switch to ON.
   3. Using the tester, measure the voltage between cockpit control module connector (i102) and chassis ground.
      NOTE:

      • Turn the electrical parts to OFF.

      Connector and terminal 

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

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

   Is the voltage 12 V or more?

   Yes:  Go to  8 .

   No:  Go to  4 .

4. CHECK FUSE  .
   1. Turn the ignition to OFF.
   2. Check the fuse No. 8 in the F/B and Auto Start Stop system.

   Is the check result OK?

   Yes:  Go to  5 .

   No:  Replace the fuse. If the fuse is blown again, check or replace the short circuit of the power supply harness. Or, perform diagnosis according to Check Auto Start Stop system.

5. CHECK HARNESS (POWER SUPPLY)  .
   1. Disconnect the connector (B12) of the DC/DC converter.
   2. Measure the resistance between cockpit control module connector (i102) and each fuse or DC/DC converter connector (B12).

      Connector and terminal 

      (i102) No. 4 - (B12) No. 1:

      (i102) No. 3 - F/B fuse No. 8:

   Is the resistance 1 Ω or less?

   Yes:  Go to  6 .

   No:  Repair or replace the open circuit of harness.

6. CHECK HARNESS (GROUND)  .

   Measure the resistance between cockpit control module connector (i102) and chassis ground.

   Connector and terminal 

   (i102) No. 7 - Chassis ground:

   Is the resistance 1 Ω or less?

   Yes:  Go to  7 .

   No:  Repair or replace the open circuit of harness.

7. CHECK BATTERY  .

   Check the battery. Ref. to STARTING/CHARGING SYSTEMS (H4DOTC)>BATTERY . Ref. to STARTING/CHARGING SYSTEMS (H4DO)>BATTERY .

   Is the check result OK?

   Yes:  Go to  8 .

   No:  Charge or replace the battery.

8. CHECK OPERATION  .
   1. Connect all connectors.
   2. Turn the ignition switch to ON and the power supply switch of the unit to ON.

   Does the power turn ON?

   Yes:  Currently no failure is found.

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