Navigation System How To Proceed With Troubleshooting

Body Electrical. Lexus Is250, Is220D. Gse20 Ale20
Navigation. Lexus Is250, Is220D. Gse20 Ale20

  1. VEHICLE BROUGHT INTO A WORKSHOP

  2. DIAGNOSTIC QUESTIONING AND SYMPTOM CONFIRMATION

  3. CHECK MULTIPLEX COMMUNICATION SYSTEM (BEAN)

  4. CONFIRM THE SYSTEM NORMAL CONDITION

  5. CHECK DTC

  6. DTC CLEAR

  7. RECHECK DTC

  8. DIAGNOSTIC TROUBLE CODE CHART

  9. PROBLEM SYMPTOMS TABLE

  10. CHECK THE ECU TERMINAL ARRANGEMENT BASED ON THE MALFUNCTION SYMPTOM

  11. CHECK THE CIRCUIT

  12. RECHECK THE DIAGNOSTIC TROUBLE CODE

  13. PERFORM CONFIRMATION TEST

Navigation System -- How To Proceed With Troubleshooting




1.VEHICLE BROUGHT INTO A WORKSHOP

    NEXT


    2.DIAGNOSTIC QUESTIONING AND SYMPTOM CONFIRMATION

    1. Ask the customer about symptoms and confirm malfunctions.



    		.
    THE SCREEN DISPLAYS NOTHING (GO TO STEP 9, AND PROCEED TO "NO IMAGE APPEARS ON MULTI-DISPLAY")

    		.
    OTHER SYMPTOMS (GO TO STEP 3)

    3.CHECK MULTIPLEX COMMUNICATION SYSTEM (BEAN)

    1. Use the intelligent tester to check for normal function of the body multiplex communication system.



    		.
    A CODE IS OUTPUT (PROCEED TO "BODY MULTIPLEX COMMUNICATION SYSTEM")

    		.
    A CODE IS NOT OUTPUT (GO TO STEP 4)

    4.CONFIRM THE SYSTEM NORMAL CONDITION


      		.
      APPLICABLE (THIS IS NOT A MALFUNCTION)

      		.
      NOT APPLICABLE (GO TO STEP 5)

      5.CHECK DTC
        HINT:
        If the system cannot enter the diagnostic mode, inspect each AVC-LAN communication component and repair or replace problem parts.


      		.
      A CODE IS OUTPUT (GO TO STEP 6)

      		.
      A CODE IS NOT OUTPUT (GO TO STEP 9)

      6.DTC CLEAR

      1. Clear the DTCs and finish the diagnostic mode.

        HINT:
        The currently output DTCs may not indicate actual malfunctions depending on the vehicle conditions.

      NEXT


      7.RECHECK DTC
        HINT:
        1. If the system cannot enter the diagnosis mode, inspect the AVC-LAN and all the components that connect to the AVC-LAN for short circuits.
        2. Even if the malfunction symptom is not confirmed, check for diagnostic trouble codes. This is because the system stores past diagnostic trouble codes.
        3. Refer to the detailed description on the diagnostic screen, as necessary (Click here).
        4. Check the diagnostic trouble code and inspect the area the code indicates.


      		.
      A CODE IS OUTPUT (GO TO STEP 8)

      		.
      A CODE IS NOT OUTPUT (GO TO STEP 9)

      8.DIAGNOSTIC TROUBLE CODE CHART

      1. Find the output code on the diagnostic trouble code chart.



      		NEXT.
      GO TO STEP 11

      9.PROBLEM SYMPTOMS TABLE

      1. Find the applicable symptom code in the problem symptoms table.

        HINT:
        If the symptom does not recur and no code is output, perform the symptom reproduction method (Click here).


      		.
      THERE IS AN APPLICABLE SYMPTOM CODE IN THE TABLE (GO TO STEP 11)

      		.
      THERE IS NO APPLICABLE SYMPTOM CODE IN THE TABLE (GO TO STEP 10)

      10.CHECK THE ECU TERMINAL ARRANGEMENT BASED ON THE MALFUNCTION SYMPTOM

        NEXT


        11.CHECK THE CIRCUIT

        1. Adjust, repair, or replace as necessary.


        NEXT


        12.RECHECK THE DIAGNOSTIC TROUBLE CODE
          HINT:
          After deleting the DTCs, recheck for diagnostic trouble codes.

        NEXT


        13.PERFORM CONFIRMATION TEST

          NEXT

          END