Power Will Not Turn On

Wiring diagram: 

• Audio system: Ref. to WIRING SYSTEM>Audio System>WIRING DIAGRAM .
• Navigation system: Ref. to WIRING SYSTEM>Navigation System>WIRING DIAGRAM .

Fig 1: Power Will Not Turn On Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK CONNECTOR CONNECTION. 

   Check that the connector is connected to the unit.

   Is the connector connected?

   • Yes  : Go to  2.
   • No  : Connect the connector.
2. CHECK CONNECTOR. 

   Check for poor contact of connectors or terminals.

   Is the connector OK?

   • Yes  : Go to  3.
   • No  : Repair or replace the harness.
3. CHECK POWER SUPPLY VOLTAGE. 
   1. Disconnect the connector.
   2. Turn the ignition switch to ACC.
   3. Using a tester, measure the voltage between connector and chassis ground.
      NOTE: Turn the electrical parts to OFF.

      Connector & terminal 

      Model without power amplifier 

      (i85) No. 4 (+) - Chassis ground (-):

      Model with power amplifier 

      (i35) 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 inside the main fuse box.

   Is the fuse OK?

   • Yes  : Go to  5.
   • No  : Replace the fuse. If the fuse is blown, check or replace the short circuit of the power supply harness.
5. CHECK HARNESS (POWER SUPPLY). 

   Measure the resistance between main fuse box and connector.

   Connector & terminal 

   F/B fuse No. 8 - (i85) No. 4:

   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 connector and chassis ground.

   Connector & terminal 

   (i85) 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(H4DO)>Battery>INSPECTION .

   Is the battery OK?

   • Yes  : Go to  8.
   • No  : Charge or replace the battery.
8. CHECK OPERATION. 
   1. Connect all connectors.
   2. Turn the ignition switch to ACC and the power supply switch of the unit to ON.

   Does the power turn ON?

   • Yes  : Currently no failure is found.
   • No  : Replace the unit. Ref. to ENTERTAINMENT>Audio .