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Home >> Subaru >> 2021 >> Ascent Touring >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Body Control System (Diagnostics) >> Basic Diagnostic Procedure >> Procedure

Basic Diagnostic Procedure: Procedure

CAUTION:
  • Subaru Select Monitor is required for reading DTC, performing diagnosis and reading data monitor.
  • Remove foreign matter (dust, water, oil, etc.) from the body integrated unit connector during removal and installation.
  • Registration of immobilizer may be needed after the replacement of control modules, etc. For detailed procedure, refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.
NOTE: To check harness for open or short circuits, shake the suspected trouble spot or connector.
  1. PERFORM CUSTOMER INTERVIEW  .

    Ask the customer when and how the trouble occurred using the interview check list. Ref. to BODY CONTROL (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 BODY CONTROL (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 [Body Control].
      NOTE: For detailed operation procedures, refer to "Help" of application.

    Is communication possible?

    Yes  : Go to  4.

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

  4. CHECK DTC  .

    Read the DTC of [Body Control] using the Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

    Are any DTCs displayed? (Current malfunction)

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

    No  : Go to  6.

  5. PERFORM DIAGNOSIS  .
    1. Perform the diagnosis for the displayed DTCs. Ref. to BODY CONTROL (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 [Body Control]. Ref. to COMMON (diag)>CLEAR MEMORY .
    4. Execute the inspection mode. Ref. to BODY CONTROL (DIAGNOSTICS)>INSPECTION MODE .
    5. Read the DTC of [Body Control] using the Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

    Are any DTCs displayed? (Current malfunction)

    Yes  : Repeat step  5 until DTC is not shown.

    No  : Finish the diagnosis.

  6. PERFORM DIAGNOSTICS WITH PHENOMENON  .

    Check the "Phenomenon List". Ref. to BODY CONTROL (DIAGNOSTICS)>Diagnostics with Phenomenon>LIST>HIGH BEAM ASSIST SYSTEM .

    Is there a symptom that corresponds in the phenomenon list?

    Yes  : Perform diagnosis according to the procedures in the phenomenon list.

    No  : Go to  7.

  7. PERFORM GENERAL DIAGNOSTICS  .

    Check "General Diagnostic Table". Ref. to BODY CONTROL (DIAGNOSTICS)>GENERAL DIAGNOSTIC TABLE .

    Is the check result OK?

    Yes  : The body control system is normal.

    No  : Perform inspection using "General Diagnostic Table".

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