Lexus IS250 · Service Manual RESTRAINTS

HOW TO PROCEED WITH TROUBLESHOOTING

Troubleshooting

HINT:
  1. Use these procedures to troubleshoot the seat belt warning system.
  2. *: Use the intelligent tester.


1.VEHICLE BROUGHT TO WORKSHOP
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    2.INSPECT BATTERY VOLTAGE

      Standard voltage:
      11 to 14 V

      If the voltage is below 11 V, recharge or replace the battery before proceeding.
    NEXT

    3.CHECK COMMUNICATION FUNCTION OF 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

    4.CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM (CAN)*

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

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


    		B.
    A

    5.PROBLEM SYMPTOMS TABLE

      HINT:
      Click here

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    6.OVERALL ANALYSIS AND TROUBLESHOOTING*

    1. DATA LIST / ACTIVE TEST (Click here)

    2. Terminals of ECU (Click here)

    3. On-vehicle Inspection (Click here)

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    7.REPAIR OR REPLACE
      NEXT

      8.CONFIRMATION TEST
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