2020 Subaru Forester BaseFACTORY OEM SERVICE PROCEDURE

Basic Diagnostic Procedure: Procedure

NOTE: For inspection of sub-switches and the regulator & motor assembly that do not communicate with Subaru Select Monitor, refer to the "GLASS/WINDOWS/MIRRORS" article. Ref. to GLASS/WINDOWS/MIRRORS>POWER WINDOW CONTROL SWITCH . Ref. to GLASS/WINDOWS/MIRRORS>FRONT REGULATOR AND MOTOR ASSEMBLY . Ref. to GLASS/WINDOWS/MIRRORS>REAR REGULATOR AND MOTOR ASSEMBLY .
  1. PERFORM CUSTOMER INTERVIEW. 

    Ask the customer when and how the trouble occurred using the interview check list. Ref. to POWER WINDOW (DIAGNOSTICS)>CHECK LIST FOR INTERVIEW .

    Did you interview the customer?

    Yes:  Go to  2.

    No:  Perform the interview, and Go to  2.

  2. BASIC INSPECTION. 

    Perform basic inspection. Ref. to POWER WINDOW (DIAGNOSTICS)>GENERAL DESCRIPTION>INSPECTION .

    Is the check result OK?

    Yes:  Go to  3.

    No:  Repair the faulty part found in basic inspection, and Go to  3.

  3. CHECK SUBARU SELECT MONITOR COMMUNICATION. 
    1. Turn the ignition switch to OFF.
    2. Connect the Subaru Select Monitor to Data Link Connector. Ref. to COMMON (DIAG)>DATA LINK CONNECTOR .
    3. Turn the ignition switch to ON and run the Subaru Select Monitor.
    4. Select [Power Window (Switch)], [Power Window (Driver)], [Power Window (Passenger)], [Power Window (Rear Right)] and [Power Window (Rear Left)].
      NOTE: For detailed operation procedures, refer to "Help" of application.

    Is communication possible?

    Yes:  Go to  4.

    No:  Check the communication circuit. Ref. to POWER WINDOW (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE FOR SUBARU SELECT MONITOR COMMUNICATION .

  4. CHECK DTC. 

    Using the Subaru Select Monitor, read the DTC in [Power Window (Switch)], [Power Window (Driver)], [Power Window (Passenger)], [Power Window (Rear Right)] and [Power Window (Rear Left)]. Ref. to POWER WINDOW (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    • Power Window (Switch)
    • Power Window (Driver)
    • Power Window (Passenger)
    • Power Window (Rear Right)
    • Power Window (Rear Left)

    Are any DTCs displayed? (Current malfunction)

    Yes:  Record the DTC, time stamp and freeze frame data, and Go to  5.

    No:  Perform diagnosis according to the procedures in the diagnostics with phenomenon. Ref. to POWER WINDOW (DIAGNOSTICS)>DIAGNOSTICS WITH PHENOMENON .

  5. PERFORM DIAGNOSIS. 
    1. Perform the diagnosis for the displayed DTCs. Ref. to POWER WINDOW (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .
    2. Repair or replace the cause of trouble.
    3. Using the Subaru Select Monitor, perform the clear memory of [Power Window (Switch)], [Power Window (Driver)], [Power Window (Passenger)], [Power Window (Rear Right)] and [Power Window (Rear Left)]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
      • Power Window (Switch)
      • Power Window (Driver)
      • Power Window (Passenger)
      • Power Window (Rear Right)
      • Power Window (Rear Left)
    4. Execute the inspection mode. Ref. to POWER WINDOW (DIAGNOSTICS)>INSPECTION MODE .
    5. Using the Subaru Select Monitor, read the DTC in [Power Window (Switch)], [Power Window (Driver)], [Power Window (Passenger)], [Power Window (Rear Right)] and [Power Window (Rear Left)]. Ref. to POWER WINDOW (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
      • Power Window (Switch)
      • Power Window (Driver)
      • Power Window (Passenger)
      • Power Window (Rear Right)
      • Power Window (Rear Left)

    Are any DTCs displayed? (Current malfunction)

    Yes:  Repeat step  5 until DTC is not shown.

    No:  Finish the diagnosis.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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