Lexus IS250 · Service Manual BODY ELECTRICAL

HOW TO PROCEED WITH TROUBLESHOOTING

Troubleshooting

HINT:
  1. Use these procedures to troubleshoot the lighting system.
  2. *: Use the intelligent tester.


1.VEHICLE BROUGHT TO WORKSHOP
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    2.CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK
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      3.INSPECT BATTERY VOLTAGE

        Standard voltage:
        11 to 14 V

        If the voltage is below 11 V, recharge or replace the battery before proceeding.
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      4.INSPECT MULTIPLEX COMMUNICATION SYSTEM (BEAN)*

      1. Use the intelligent tester to check if the Multiplex Communication System (MPX) is functioning normally.

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


      		B.
      A

      5.CHECK FOR DTC*

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


      		B.
      A

      6.PROBLEM SYMPTOMS TABLE

        Result:
        Result
        		 Proceed to
        If fault is not listed in problem symptoms table
        		 A
        If fault is listed in problem symptoms table
        		 B


      		B.
      A

      7.OVERALL ANALYSIS AND TROUBLESHOOTING*

      1. Data List / Active Test (Click here)

      2. Terminals of ECU (Click here)

      3. Inspection

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      8.ADJUST, REPAIR OR REPLACE
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        9.CONFIRMATION TEST
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