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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> 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)

CAUTION:
  • When the keyless access CM 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.
  • When the keyless access CM is replaced, registration of the immobilizer is required. For the relevant procedures, refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume. Contact an authorized Subaru Dealership.
  1. CHECK FUSE. 

    Check the fuse. Ref. to SECURITY AND LOCKS>Relay and Fuse .

    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 for any deformation or looseness.

    Is the check result OK?

    • Yes  : Go to 4. 
    • No  : Repair the connector, or replace harness.
  4. CHECK WIRING HARNESS. 
    1. Disconnect the keyless access CM connector.
    2. Using a tester, measure the voltage between the keyless access CM connector and chassis ground.

      Connector & terminal 

      (B572) No. 2 (+) - 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 WIRING HARNESS (OPEN). 

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

    Connector & terminal 

    (B572) No. 11 - 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 CM connector.
    2. Carrying the access key, depress the brake pedal (except for MT model) or clutch pedal (MT model), and push the push button ignition switch.
    3. Read the DTC of [Keyless Access with Push Button Start] using the Subaru Select Monitor. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

    Is DTC output?

    • Yes  : Perform the diagnosis according to DTC.
    • No  : Go to 7. 
  7. CHECK DATA MONITOR. 
    1. Using the Subaru Select Monitor, display the data monitor [Push start SW 1] and [Push start SW 2] of [Keyless Access with Push Button Start]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Data Monitor .
    2. Read the data when pressing the push button ignition switch.

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

    • Yes  : Go to 8. 
    • No  : Go to  15.
  8. CHECK RELAY (PUSH BUTTON START). 

    Check IG relay 1 and 2 (push button start), and accessory relay (push button start). Ref. to SECURITY AND LOCKS>IG Relay1 (Push Button Start)>INSPECTION .

    Is the check result OK?

    • Yes  : Go to 9. 
    • No  : Replace the faulty relay.
  9. CHECK WIRING HARNESS (OPEN). 
    1. Disconnect the keyless access CM 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 CM connector, IG relay 1 (push button start), IG relay 2 (push button start) and accessory relay (push button start).

      Connector & terminal 

      (B574) No. 6 - (B225) No. 38:

      (B572) No. 9 - (B225) No. 34:

      (B574) No. 4 - (B426) No. 1:

    Is there continuity?

    • Yes  : Go to 10. 
    • No  : Repair or replace the open circuit of harness.
  10. CHECK WIRING HARNESS (GROUND SHORT CIRCUIT). 

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

    Connector & terminal 

    (B572) No. 9 - Chassis ground:

    (B574) No. 4 - Chassis ground:

    (B574) No. 6 - Chassis ground:

    Is there continuity?

    • Yes  : Repair or replace the short circuit of the harness.
    • No  : Go to 11. 
  11. CHECK WIRING HARNESS (OPEN). 

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

    Connector & terminal 

    (B225) No. 39 - Chassis ground:

    Is there continuity?

    • Yes  : Go to 12. 
    • No  : Repair or replace the open circuit of harness.
  12. CHECK WIRING HARNESS (OPEN). 

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

    Connector & terminal 

    (B225) No. 35 - Chassis ground:

    Is there continuity?

    • Yes  : Go to 13. 
    • No  : Repair or replace the open circuit of harness.
  13. CHECK WIRING HARNESS (OPEN). 

    Using a tester, check continuity between the accessory relay (push button start) connector and chassis ground.

    Connector & terminal 

    (B426) No. 3 - Chassis ground:

    Is there continuity?

    • Yes  : Go to 14. 
    • No  : Repair or replace the open circuit of harness.
  14. CHECK KEYLESS ACCESS CM. 
    1. Connect all the disconnected connectors.
    2. Using a tester, measure the voltage between the keyless access CM connector and chassis ground when the ignition is turned from OFF to ON.

      Connector & terminal 

      (B572) No. 9 (+) - Chassis ground (-):

      (B574) No. 4 (+) - Chassis ground (-):

      (B574) No. 6 (+) - Chassis ground (-):

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

  15. 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 terminals.

      Connector & terminal 

      (i150) No. 7 - (i150) No. 5:

      (i150) No. 2 - (i150) No. 5:

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

  16. CHECK WIRING HARNESS (OPEN). 

    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 17. 
    • No  : Repair or replace the open circuit of harness.
  17. CHECK WIRING HARNESS (OPEN). 
    1. Disconnect the keyless access CM connector.
    2. Using a tester, check continuity between the keyless access CM connector and the push button ignition switch connector.

      Connector & terminal 

      (i150) No. 7 - (B574) No. 28:

      (i150) No. 2 - (B574) No. 30:

    Is there continuity?

    • Yes  : System is normal.
    • No  : Repair or replace the open circuit of harness.
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