For C0 And C5 Only: Wiring diagram

Push button start system Ref. to WIRING SYSTEM>Push Button Start System>WIRING DIAGRAM .

• Non-turbo engine model
  Fig 1: C0 And C5 System Wiring Diagram (Non-Turbo Engine Model)

  Courtesy of SUBARU OF AMERICA, INC.
• Turbo engine model

Fig 2: C0 And C5 System Wiring Diagram (Turbo Engine Model)

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK GROUNDING POINT. 

   Check the grounding point of the engine ground and chassis ground.

   Is there any looseness? Are there any foreign matters caught on the ground or contact surface? Are there any oil-soiled areas?

   • Yes  : Remove the foreign matters, and tighten to the specified torque. Then start the engine, and check that the fault was removed. Check the DTC Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) ., and when DTC B1572 is still displayed, go to 2.
   • No  : Go to 2. 
2. CHECK DATA MONITOR. 
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor, check the data monitor. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Data Monitor .
   3. Display the following data: [Immobilizer] [Engine start] [Unlock confirmation].

      Data 

      Immobilizer = Unset:

      Engine start = Engine start permission:

      Unlock confirmation = Confirmed:

   Is the data displayed as described above?

   • Yes  : Go to 3. 
   • No  : Perform diagnostics with phenomenon. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostics with Phenomenon>INSPECTION>ENGINE DOES NOT START .
3. CHECK DATA MONITOR. 

   Use the Subaru Select Monitor to check the data when holding down the push button ignition switch while depressing on the brake pedal (AT model) or clutch pedal (MT model). Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Data Monitor .

   Data 

   EGI code reception status = Reception:

   NOTE: If Reception is displayed, the status changes to Not yet received in 10 seconds. When performing the check, perform the check after turning the ignition to OFF.

   Is the data displayed as described above?

   • Yes  : Go to 4. 
   • No  : Repair or replace the harness between ID code box and ECM.
4. CHECK WIRING HARNESS. 
   1. Turn the ignition switch to OFF.
   2. Disconnect the ID code box connector and the ECM connector.
   3. Using a tester, measure the resistance between ID code box connector and ECM connector.

      Connector & terminal 

      Non-turbo engine model 

      (B422) No. 4 - (B134) No. 48:

      Turbo engine model 

      (B422) No. 4 - (E158) No. 43:

   Is the resistance less than 10 Ω?

   • Yes  : Go to 5. 
   • No  : Repair or replace the open circuit of harness.
5. CHECK WIRING HARNESS. 

   Using a tester, measure the resistance between ID code box connector and chassis ground.

   Connector & terminal 

   (B422) No. 5 - Chassis ground:

   Is the resistance less than 10 Ω?

   • Yes  : Go to 6. 
   • No  : Repair or replace the open circuit of harness.
6. CHECK ECM. 
   1. Install the ECM from other normal operating vehicle (with push button start) which use same ECM to the vehicle to be diagnosed.
   2. Perform ECM registration. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume. Contact an authorized Subaru Dealership.

   Is ECM registration finished? And does the engine start?

   • Yes  : Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine CM (ECM)>REMOVAL . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>Engine CM (ECM)>REMOVAL . Install the ECM from other vehicle to the original vehicle.
   • No  : Replace the ID code box. Ref. to SECURITY AND LOCKS>ID Code Box .