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Home >> Subaru >> 2019 >> WRX STI Limited >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Security And Locks - Keyless Access (W/Push Button Start) (Diagnostics) >> Diagnostics With Phenomenon >> Inspection >> Power Will Not Turn On (Both Accessory And Ignition)

Power Will Not Turn On (Both Accessory And Ignition)

Trouble causes: 

CAUTION:
  • When the keyless access control module is replaced with a new unit, and the battery ground terminal is connected, it will become ignition ON. Also, if the battery is disconnected, it will resume to a condition with the battery cut off.
  • For replacement procedure of keyless access control module, refer to the "REGISTRATION INSTRUCTIONS FOR IMMOBILIZER" provided as a separate volume.
  • Before performing diagnosis, refer to "CAUTION" in "General Description". Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .
  1. CHECK FUSE. 

    Check the fuse. Refer to SECURITY AND LOCKS>RELAY AND FUSE>INSPECTION .

    Is the check result OK?

    Yes:  Go to  2.

    No:  Replace the fuse.

  2. CHECK POWER SUPPLY. 
    1. Remove IG relay 1 (push button start), IG relay 2 (push button start) and accessory relay (push button start).
    2. Using a tester, measure the voltage between the relay block connector and chassis ground.

      Is the voltage 10 V or more?

      Yes:  Go to  3.

      No:  Check the DC power supply circuit.

  3. CHECK CONNECTOR. 

    Check the engagement of each connector and terminal for any deformation or looseness.

    Is the check result OK?

    Yes:  Go to  4.

    No:  Repair the connector, or replace harness.

  4. CHECK HARNESS (OPEN CIRCUIT). 
    1. Disconnect the keyless access control module connector.
    2. Using a tester, measure the voltage between the keyless access control module connector and chassis ground.

      Connector & terminal 

      (B573) No. 1 (+) - Chassis ground (-):

      (B573) No. 4 (+) - Chassis ground (-):

      Is the voltage between 8 V and 16 V?

      Yes:  Go to  5.

      No:  Repair or replace the open circuit of harness.

  5. CHECK HARNESS (OPEN CIRCUIT). 

    Using a tester, check continuity between the keyless access control module connector and chassis ground.

    Connector & terminal 

    (B574) No. 17 - Chassis ground:

    (B573) No. 20 - Chassis ground:

    Is there continuity?

    Yes:  Go to  6.

    No:  Repair or replace the open circuit of harness.

  6. CHECK DTC. 
    1. Connect the keyless access control module connector.
    2. Carrying the access key, depress the brake pedal (CVT model) or clutch pedal (MT model), and push the push button ignition switch.
    3. Read DTCs of «Keyless Access with Push Button Start» using the Subaru Select Monitor. Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

      Are any DTCs displayed? (Current malfunction)

      Yes:  Perform the diagnosis for the displayed DTCs.

      No:  Go to  7.

  7. CHECK DATA MONITOR. 
    1. Display the current data «Push start SW 1» and «Push start SW 2» of «Keyless Access with Push Button Start» using Subaru Select Monitor. Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>DATA MONITOR .
    2. Using the Subaru Select Monitor, check the following items on «Data monitor» of «Keyless Access with Push Button Start».
      • «Push start SW 1»
      • «Push start SW 2»
    3. Read the data when pressing the push button ignition switch. Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

      Does it change from OFF to ON along with the operation?

      Yes:  Go to  8.

      No:  Go to  13.

  8. CHECK RELAY (PUSH BUTTON START). 

    Check IG relay 1 and 2 (push button start), and accessory relay (push button start). Refer to SECURITY AND LOCKS>RELAY AND FUSE .

    Is the check result OK?

    Yes:  Go to  9.

    No:  Replace the faulty relay.

  9. CHECK HARNESS (OPEN CIRCUIT). 
    1. Disconnect the keyless access control module connector, IG relay 1 (push button start), IG relay 2 (push button start) and accessory relay (push button start).
    2. Using a tester, check continuity between terminals of keyless access control module connector, IG relay 1 (push button start), IG relay 2 (push button start) and accessory relay (push button start).

      Connector & terminal 

      (B573) No. 28 - (B225) No. 38:

      (B573) No. 27 - (B225) No. 34:

      (B573) No. 16 - (B426) No. 1:

      Is there continuity?

      Yes:  Go to  10.

      No:  Repair or replace the open circuit of harness.

  10. CHECK HARNESS (GROUND SHORT CIRCUIT). 

    Using a tester, check continuity between the keyless access control module connector and chassis ground.

    Connector & terminal 

    (B573) No. 28 - Chassis ground:

    (B573) No. 27 - Chassis ground:

    (B573) No. 16 - Chassis ground:

    Is there continuity?

    Yes:  Repair or replace the short circuit of the harness.

    No:  Go to  11.

  11. CHECK HARNESS (OPEN CIRCUIT). 

    Using a tester, check continuity between IG relay 1 (push button start), IG relay 2 (push button start), accessory relay (push button start) and chassis ground.

    Connector & terminal 

    (B225) No. 39 - Chassis ground:

    (B225) No. 35 - Chassis ground:

    (B426) No. 2 - Chassis ground:

    Is there continuity?

    Yes:  Go to  12.

    No:  Repair or replace the open circuit of harness.

  12. CHECK KEYLESS ACCESS control module. 
    1. Connect all the disconnected connectors.
    2. Using a tester, measure the voltage between the keyless access control module connector and chassis ground when the ignition is turned from OFF to ON.

      Connector & terminal 

      (B573) No. 28 (+) - Chassis ground (-):

      (B573) No. 27 (+) - Chassis ground (-):

      (B573) No. 16 (+) - Chassis ground (-):

      Did the voltage change from 1 V or less to +B-2 V or more?

      Yes:  Go to  13.

      No:  Replace the keyless access control module. Refer to SECURITY AND LOCKS>KEYLESS ACCESS control module .

  13. CHECK PUSH BUTTON IGNITION SWITCH. 
    1. Disconnect the push button ignition switch connector.
    2. Using a tester, check the continuity between the push button ignition switch connector terminals.

      Terminals 

      No. 7 - No. 5:

      No. 2 - No. 5:

      When the button was pressed, did it change to continuity exists? (No continuity when button is released)

      Yes:  Go to  14.

      No:  Replace the push button ignition switch. Refer to SECURITY AND LOCKS>PUSH BUTTON IGNITION SWITCH .

  14. CHECK HARNESS (OPEN CIRCUIT). 

    Using a tester, check the continuity between the push button ignition switch connector and chassis ground.

    Connector & terminal 

    (i150) No. 4 - Chassis ground:

    (i150) No. 5 - Chassis ground:

    Is there continuity?

    Yes:  Go to  15.

    No:  Repair or replace the open circuit of harness.

  15. CHECK HARNESS (OPEN CIRCUIT). 
    1. Disconnect the keyless access control module connector.
    2. Using a tester, check continuity between the keyless access control module connector and the push button ignition switch connector.

      Connector & terminal 

      (i150) No. 7 - (B573) No. 8:

      (i150) No. 2 - (B573) No. 9:

      Is there continuity?

      Yes:  The circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

      NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

      No:  Repair or replace the open circuit of harness.

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