Seat Belt Warning System - How To Proceed With Troubleshooting

Lexus IS250 IS220d GSE20 ALE20 - SEAT BELT


SEAT BELT WARNING SYSTEM - HOW TO PROCEED WITH TROUBLESHOOTING

  • HINT:
Use these procedures to troubleshoot the seat belt warning system.
*: 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.

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3.CHECK COMMUNICATION FUNCTION OF MULTIPLEX COMMUNICATION SYSTEM (BEAN)*

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

Result:
ResultProceed to
MPX DTC is not outputA
MPX DTC is outputB
B.
GO TO MULTIPLEX COMMUNICATION SYSTEM
A
4.CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM (CAN)*

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

Result:
ResultProceed to
CAN DTC is not outputA
CAN DTC is outputB
B.
GO TO CAN COMMUNICATION SYSTEM
A
5.PROBLEM SYMPTOMS TABLE
  • HINT:
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6.OVERALL ANALYSIS AND TROUBLESHOOTING*

DATA LIST / ACTIVE TEST

Terminals of ECU

On-vehicle Inspection

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7.REPAIR OR REPLACE
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8.CONFIRMATION TEST
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END