Lexus IS250 · Service Manual CRUISE CONTROL SYSTEM

HOW TO PROCEED WITH TROUBLESHOOTING

Troubleshooting

HINT:
  1. Use the following procedures to troubleshoot the dynamic radar cruise control system.
  2. *: Use the intelligent tester.


1.VEHICLE BROUGHT TO WORKSHOP
    NEXT

    2.CUSTOMER PROBLEM ANALYSIS
      NEXT

      3.PROBLEM SYMPTOM CONFIRMATION

        Result:
        Condition
        		 Proceed to
        Symptom occurs
        		 A
        Symptom does not occur
        		 B


      		B.
      A

      4.INSPECT BATTERY VOLTAGE

        Standard voltage:
        11 to 14 V
        If the voltage is below 11 V, replace or recharge the battery before proceeding.

      NEXT

      5.CHECK COMMUNICATION FUNCTION OF MULTIPLEX COMMUNICATION SYSTEM (BEAN)

      1. Use the intelligent tester to check if the multiplex communication system (MPX) is functioning normally.

        2. Result 
        Result
        		 Proceed to
        MPX DTC is not output
        		 A
        MPX DTC is output
        		 B

      		B.
      A

      6.CHECK COMMUNICATION FUNCTION OF CONTROLLER AREA NETWORK (CAN)

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

      2. Check for DTCs.

        3. Result:
        Condition
        		 Proceed to
        DTC is not output
        		 A
        DTC is output
        		 B


      		B.
      A

      7.DTC CHECK

        Result:
        Condition
        		 Proceed to
        DTC is output
        		 A
        DTC is not output
        		 B


      		B.
      A

      8.DTC CHART
        NEXT

        9.PROBLEM SYMPTOMS TABLE
          NEXT

          10.CIRCUIT INSPECTION
            NEXT

            11.TERMINALS OF ECM
              NEXT

              12.IDENTIFICATION OF PROBLEM
                NEXT

                13.REPAIR OR REPLACE
                  NEXT

                  14.CONFIRMATION TEST
                    NEXT

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