Pre-Crash Safety System - How To Proceed With Troubleshooting

Lexus IS250 IS220d GSE20 ALE20 - PRE-CRASH SAFETY


PRE-CRASH SAFETY SYSTEM - HOW TO PROCEED WITH TROUBLESHOOTING

  • HINT:
Use these procedures to troubleshoot the pre-crash safety system.
The intelligent tester should be used in steps 2, 3, 4 and 6.

1.VEHICLE BROUGHT TO WORKSHOP
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2.CHECK MULTIPLEX COMMUNICATION SYSTEM

Use the intelligent tester to check if the multiplex communication system is functioning normally.

  • Result:
  • DTC ConditionProceed to
    DTC is not outputA
    DTC is outputB
B.
Go to MULTIPLEX COMMUNICATION SYSTEM
A
3.CHECK CAN COMMUNICATION SYSTEM

Use the intelligent tester to check for normally functioning of CAN communication system.


Perform bus check (Communication malfunctioning DTC).

Perform bus check (Communication Bus check).

  • Result:
  • DTC ConditionProceed to
    DTC is not outputA
    DTC is outputB
B.
Go to CAN COMMUNICATION SYSTEM
A
4.CHECK FOR DTC

Check for DTCs.


Record the DTCs.

Clear the DTCs.

Recheck for DTCs.


Attempt to duplicate the malfunction and check if the DTCs are output again .

  • Result:
  • DTC ConditionProceed to
    DTC is not outputA
    DTC is outputB
    No DTC is output, and malfunction can not be duplicate or checkedC
B.
Go to DTC Chart
C.
SYMPTOM SIMULATION
A
5.PROBLEM SYMPTOMS TABLE

If the result is not listed in the problem symptoms table proceed to A.

If the result is listed in the problem symptoms table proceed to B.

B.
Go to step 7
A
6.OVERALL ANALYSIS AND TROUBLESHOOTING

DATA LIST/ACTIVE TEST .

Terminals of ECU .

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7.ADJUST, REPAIR OR REPLACE
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8.CONFIRMATION TEST
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END