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Home >> Subaru >> 2023 >> Ascent Base >> Repair and Diagnosis >> Accessories & Equipment >> Wiper/Washer Systems >> Automatic Light And Wiper System (Diagnostics) >> Basic Diagnostic Procedure >> Procedure

Basic Diagnostic Procedure: Procedure

  1. PERFORM CUSTOMER INTERVIEW  .

    Ask the customer when and how the trouble occurred using the Check List for Interview. Ref. to AUTOMATIC LIGHT AND WIPER (DIAGNOSTICS)>CHECK LIST FOR INTERVIEW>CHECK .

    Did you interview the customer?

    Yes:  Go to  2.

    No:  Perform the interview, and Go to  2.

  2. CHECK CAN COMMUNICATION  .
    1. Turn the ignition switch to ON.
    2. Read the DTC of the LAN system using the Subaru Select Monitor. Ref. to LAN SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Are any DTCs displayed? (Current code)

    Yes:  Perform the diagnosis of the displayed DTCs for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

    No:  Go to  3.

  3. CHECK RAIN SENSOR  .

    Read the DTC of [Automatic Light and Wiper] using the Subaru Select Monitor. Ref. to AUTOMATIC LIGHT AND WIPER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Are any DTCs displayed? (Current code)

    Yes:  Record the DTC, time stamp and freeze frame data, and Go to  9.

    No:  Go to  4.

  4. CHECK BODY INTEGRATED UNIT  .

    Inspect the body integrated unit.

    Are any DTCs displayed? (Current code)

    Yes:  Perform the diagnosis for the displayed DTCs.

    No:  Go to  5.

  5. CHECK RAIN SENSOR  .
    1. Turn the wiper switch to AUTO.
    2. Turn the ignition switch to ON.
    3. Drip some water to the rain sensor area of windshield glass.

    Does the front wiper operate?

    Yes:  System is normal.

    No:  Go to  6.

  6. CHECK COMBINATION SWITCH  .

    Check the combination switch (wiper). Ref. to WIPER AND WASHER SYSTEMS>COMBINATION SWITCH (WIPER)>INSPECTION .

    Is the check result OK?

    Yes:  Go to  7.

    No:  Replace the combination switch (wiper). Ref. to WIPER AND WASHER SYSTEMS>COMBINATION SWITCH (WIPER) .

  7. CHECK RAIN SENSOR  .
    1. Connect all the disconnected connectors.
    2. Turn the ignition switch to ON.
    3. Read the DTC of [Automatic Light and Wiper] using the Subaru Select Monitor. Ref. to AUTOMATIC LIGHT AND WIPER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Are any DTCs displayed? (Current code)

    Yes:  Record the DTC and freeze frame data, and Go to  9.

    No:  Go to  8.

  8. CHECK OPERATION OTHER THAN AUTO  .
    1. Turn the ignition switch to ON.
    2. Check that the wipers operate properly with the combination switch set to other than AUTO.

    Is the operation OK?

    Yes:  System is normal.

    No:  Check the wiper/washer system. Ref. to WIPER AND WASHER SYSTEMS>WIPER AND WASHER SYSTEM>INSPECTION .

  9. PERFORM DIAGNOSIS  .
    1. Perform the diagnosis for the displayed DTCs. Ref. to AUTOMATIC LIGHT AND WIPER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .
    2. Repair or replace the cause of trouble.
    3. Turn the ignition switch to ON.
    4. Using the Subaru Select Monitor, perform the clear memory of [Automatic Light and Wiper]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY .
    5. Execute the inspection mode. Ref. to AUTOMATIC LIGHT AND WIPER (DIAGNOSTICS)>INSPECTION MODE .
    6. Read the DTC of [Automatic Light and Wiper] using the Subaru Select Monitor. Ref. to AUTOMATIC LIGHT AND WIPER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Are any DTCs displayed? (Current code)

    Yes:  Perform the diagnosis for the displayed DTCs. Ref. to AUTOMATIC LIGHT AND WIPER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

    No:  Finish the diagnosis.

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