LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 2019 >> Forester Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (General) >> Diagnostics with Phenomenon >> Starter Motor Circuit >> Model With Push Button Start
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Model With Push Button Start

Wiring diagram: 

Engine Electrical System Ref. to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM .

G13227884Courtesy of SUBARU OF AMERICA, INC.
G13227885Courtesy of SUBARU OF AMERICA, INC.
CAUTION: Use the check board when measuring the ECM terminal voltage and resistance. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD .
  1. CHECK BATTERY  .

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

    Is the check result OK?

    Yes

    Go to  2 .

    No

    Charge or replace the battery. Ref. to STARTING/CHARGING SYSTEMS (H4DO)>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. Ref. to COMMON(DIAG)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Are any DTCs displayed?

    Yes

    Check the appropriate DTC using the "Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>DIAGNOSTIC TROUBLE CODE (DTC) .

    No

    Check ignition control system. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>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.

    Does the ignition turn to ON?

    Yes

    Go to  5 .

    No

    Check the push button start system. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DIAGNOSTICS WITH PHENOMENON>LIST .

  5. CHECK PUSH BUTTON IGNITION SWITCH  .
    1. Depress the brake pedal.
      NOTE: Shift the select lever to "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. Ref. 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 the "Data Monitor". Ref. to COMMON(DIAG)>DATA MONITOR .
    2. Press the push button ignition switch once with the brake pedal 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 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 depressed.

      Connector & terminal 

      (B134) No. 25 (+) - Engine 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. Place the select lever in "P" range or "N" range.
    4. Press the push button ignition switch once with the brake pedal 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. Ref. to STARTING/CHARGING SYSTEMS (H4DO)>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 J/C
  13. CHECK IG2 RELAY  .

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

    Is the check result OK?

    Yes

    Go to  14 .

    No

    Replace the IG2 relay. Ref. 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-3 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. Ref. to STARTING/CHARGING SYSTEMS (H4DO)>STARTER RELAY>INSPECTION .

    Is the check result OK?

    Yes

    Go to  17 .

    No

    Replace the starter cut relay. Ref. to STARTING/CHARGING SYSTEMS (H4DO)>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, 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: Shift the select lever to "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
  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. Ref. to STARTING/CHARGING SYSTEMS (H4DO)>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. Ref. to STARTING/CHARGING SYSTEMS (H4DO)>STARTER RELAY>LOCATION .

    NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .
scientia non olet · About LEMON Manuals