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Model With Push Button Start

Wiring diagram: 

Engine Electrical System Refer to WIRING SYSTEM (IMPREZA MODEL)>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM . Refer to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM .

G12400085Courtesy of SUBARU OF AMERICA, INC.
G12400086Courtesy of SUBARU OF AMERICA, INC.
CAUTION: Use the check board when measuring the ECM terminal voltage and resistance. Refer to ENGINE (DIAGNOSTICS) (H4DO (EXCEPT FOR HEV))>General Description>PREPARATION TOOL>HOW TO USE CHECK BOARD .
  1. CHECK BATTERY  .

    Check the battery. Refer to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>BATTERY .

    Is the check result OK?

    Yes:  Go to  2.

    No:  Charge or replace the battery. Refer to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>BATTERY .

  2. CHECK OPERATION OF STARTER MOTOR  .

    Does the starter motor operate?

    Yes:  Go to  3.

    No:  Go to  4.

  3. CHECK DTC  .

    Read the DTC of [Engine Control System] using the Subaru Select Monitor. Refer to ENGINE (DIAGNOSTICS) (H4DO (EXCEPT FOR HEV))>DIAGNOSTIC TROUBLE CODE (DTC) .

    Are any DTCs displayed?

    Yes:  Check the appropriate DTC using the "Diagnostic Trouble Code (DTC)". Refer to ENGINE (DIAGNOSTICS) (H4DO (EXCEPT FOR HEV))>DIAGNOSTIC TROUBLE CODE (DTC) .

    No:  Check ignition control system. Refer to ENGINE (DIAGNOSTICS) (H4DO (EXCEPT FOR HEV))>DIAGNOSTICS WITH PHENOMENON>IGNITION CONTROL SYSTEM .

  4. CHECK PUSH BUTTON IGNITION SWITCH  .

    Press the push button ignition switch twice with the ignition OFF (ACC OFF).

    NOTE:
    • Release the brake pedal. (CVT model)
    • Release the clutch pedal. (MT model)

    Does the ignition turn to ON?

    Yes:  Go to  5.

    No:  Check the push button start system. Refer to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DIAGNOSTICS WITH PHENOMENON>LIST .

  5. CHECK PUSH BUTTON IGNITION SWITCH  .
    1. Depress the brake pedal (CVT model) or clutch pedal (MT model).
      NOTE: For CVT model, position the select lever in "P" range.
    2. Check the push button ignition switch indicator.

    Does the indicator turn to green?

    Yes:  Go to  6.

    No:  Check the push button start system. Refer to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DIAGNOSTICS WITH PHENOMENON>LIST .

  6. CHECK START SWITCH SIGNAL  .
    1. Using the Subaru Select Monitor, read the waveform in [Starter Switch].
      NOTE: For detailed operation procedures, refer to "Data Monitor". Refer to ENGINE (DIAGNOSTICS) (H4DO (EXCEPT FOR HEV))>DATA MONITOR .
    2. Press the push button ignition switch once with the brake pedal (CVT model) or clutch pedal (MT model) depressed.

    Does a waveform occur in [Starter Switch]?

    Yes:  Go to  10.

    No:  Go to  7.

  7. CHECK HARNESS BETWEEN ECM AND KEYLESS ACCESS CONTROL MODULE  .
    1. Turn the ignition to OFF.
    2. Disconnect the connector from ECM.
    3. Disconnect the connector from the keyless access control module.
    4. Measure the resistance of harness between ECM connector and keyless access control module.

      Connector & terminal 

      (B134) No. 25 - (i75) No. 23:

    Is the resistance less than 1 Ω?

    Yes:  Go to  8.

    No:  Repair the harness and connector.

    NOTE: In this case, repair the following item:
    • Open circuit of harness between ECM connector and keyless access control module connector
    • Poor contact of coupling connector
  8. CHECK HARNESS BETWEEN ECM AND KEYLESS ACCESS control module  .

    Measure the resistance between the ECM connector and engine ground.

    Connector & terminal 

    (B134) No. 25 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  9.

    No:  Repair the short circuit to ground in harness between ECM connector and keyless access control module connector.

  9. CHECK START SWITCH SIGNAL  .
    1. Connect the connector to ECM.
    2. Connect the connector to the keyless access control module.
    3. Read the waveform of start switch signal using an oscilloscope.
    4. Press the push button ignition switch once with the brake pedal (CVT model) or clutch pedal (MT model) depressed.

      Connector & terminal 

      (B134) No. 25 (+) - Chassis ground (-):

    Does waveform of the start switch signal occur?

    Yes:  Repair the poor contact of ECM connector.

    No:  Repair the poor contact of keyless access control module connector.

  10. CHECK INPUT SIGNAL FOR STARTER MOTOR  .
    1. Turn the ignition to OFF.
    2. Disconnect the connector from starter motor.
    3. Set the select lever in "P" range or "N" range (CVT model), or the shift lever in neutral. (MT model)
    4. Press the push button ignition switch once with the brake pedal (CVT model) or clutch pedal (MT model) depressed.
    5. Measure the voltage between the starter motor connector and the engine ground.

      Connector & terminal 

      (F162) No. 1 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    Yes:  Check the starter motor. Refer to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>STARTER .

    No:  Go to  11.

  11. CHECK INPUT VOLTAGE OF IG2 RELAY  .
    1. Turn the ignition to OFF.
    2. Remove the IG2 relay.
    3. Turn the ignition to ON.
    4. Measure the voltage between F/B (IG2 relay) connector and chassis ground.

      Connector & terminal 

      (B56) No. 8 (+) - Chassis ground (-):

      (i137) No. 12 (+) - Chassis ground (-):

    Is the voltage 10 V or more?

    Yes:  Go to  12.

    No:  Check the following item and repair or replace if necessary.

    • Open circuit or short circuit to ground in harness between F/B (IG2 relay) connector and power supply circuit
    • Open circuit or short circuit to ground in harness between F/B (IG2 relay) connector and keyless access control module connector
    • Blown out of fuse
  12. CHECK IG2 RELAY GROUND CIRCUIT  .
    1. Turn the ignition to OFF.
    2. Measure the resistance in harness between F/B (IG2 relay) connector and chassis ground.

      Connector & terminal 

      (B158) No. 3 - Chassis ground:

      (i136) No. 6 - Chassis ground:

    Is the resistance less than 5 Ω?

    Yes:  Go to  13.

    No:  Check the following item and repair if necessary.

    • Open circuit of the harness between F/B (IG2 relay) connector and chassis ground
    • Poor contact of joint connector
  13. CHECK IG2 RELAY  .

    Check the F/B (IG2 relay). Refer to SECURITY AND LOCKS>RELAY AND FUSE>INSPECTION>CHECK RELAY .

    Is the check result OK?

    Yes:  Go to  14.

    No:  Replace the IG2 relay. Refer to SECURITY AND LOCKS>RELAY AND FUSE>LOCATION .

  14. CHECK INPUT VOLTAGE OF STARTER CUT RELAY  .
    1. Remove the starter cut relay.
    2. Install the IG2 relay.
    3. Turn the ignition to ON.
    4. Measure the voltage between M/B (starter cut relay) terminal No. 1 and No. 2 and engine ground.

      Terminals 

      No. 1 (+) - Engine ground (-):

      No. 2 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    Yes:  Go to  15.

    No:  Check the following item and repair if necessary.

    • Open circuit or short circuit to ground in harness between SBF-6 and M/B (starter cut relay)
    • Open circuit or short circuit to ground in harness between M/B (starter cut relay) and F/B (IG2 relay) connector
    • Blown out of fuse
    • Poor contact of F/B connector
    • Replacement of F/B
    • Replace M/B
  15. CHECK HARNESS BETWEEN ECM AND M/B (STARTER CUT RELAY)  .
    1. Turn the ignition to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and M/B (starter cut relay) terminal No. 4.

      Connector & terminal 

      (B134) No. 24 - No. 4:

    Is the resistance less than 1 Ω?

    Yes:  Go to  16.

    No:  Check the following item and repair if necessary.

    • Open circuit in harness between ECM connector and M/B (starter cut relay)
    • Replace M/B
  16. CHECK STARTER CUT RELAY  .

    Check the starter cut relay. Refer to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>STARTER RELAY>INSPECTION .

    Is the check result OK?

    Yes:  Go to  17.

    No:  Replace the starter cut relay. Refer to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>STARTER RELAY>LOCATION .

  17. CHECK INPUT VOLTAGE OF STARTER RELAY  .
    1. Remove the starter relay.
    2. Install the starter cut relay.
    3. Connect the connector to ECM.
    4. While depressing the brake pedal (CVT model) or clutch pedal (MT model), press the push button ignition switch once, and measure the voltage between M/B (starter relay) terminal No. 1 and No. 2 and engine ground.

      Terminals 

      No. 1 (+) - Engine ground (-):

      No. 2 (+) - Engine ground (-):

      NOTE: For CVT model, position the select lever in "P" range.

    Is the voltage 10 V or more?

    Yes:  Go to  18.

    No:  Check the following item and repair if necessary.

    • Open circuit in harness between M/B (starter relay) and M/B (starter cut relay)
    • Open circuit of the harness between M/B (starter relay) and F/B (IG2 relay) connector (CVT model)
    • Open circuit in harness between M/B (starter relay) and clutch start switch connector (MT model)
  18. CHECK HARNESS BETWEEN ECM AND M/B (STARTER RELAY)  .
    1. Turn the ignition to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and M/B (starter relay) terminal No. 4.

      Connector & terminal 

      (B134) No. 2 - No. 4:

    Is the resistance less than 1 Ω?

    Yes:  Go to  19.

    No:  Check the following item and repair if necessary.

    • Open circuit in harness between ECM connector and M/B (starter relay)
    • Replace M/B
  19. CHECK STARTER RELAY  .

    Check the starter relay. Refer to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>STARTER RELAY>INSPECTION .

    Is the check result OK?

    Yes:  Check the following item and repair if necessary.

    • Open circuit of harness between M/B (starter relay) and starter motor connector
    • Poor contact of coupling connector

    No:  Replace the starter relay. Refer to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>STARTER RELAY>LOCATION .

NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Refer to ENGINE (DIAGNOSTICS) (H4DO (EXCEPT FOR HEV))>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .
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