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Home >> Lexus >> 2021 >> GX 460 Base >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Pre-Collision System (Diagnostics - Introduction) >> Pre-Collision System >> How To Proceed With Troubleshooting [08/2015 - 08/2019] >> Procedure
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How To Proceed With Troubleshooting [08/2015 - 08/2019]: Procedure

  1. VEHICLE BROUGHT TO WORKSHOP 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  2

  2. INSPECT BATTERY VOLTAGE 

    Standard voltage

    11 to 14 V

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

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  3

  3. CHECK CAN COMMUNICATION SYSTEM* 
    1. Using the Techstream, check if the CAN communication system is functioning normally.

      Result

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

    Result: 

    GO TO CAN COMMUNICATION SYSTEM. Refer to  DIAGNOSIS SYSTEM [08/2015 - 08/2019] 

    Result: 

    See step  4

  4. CHECK FOR DTC* 
    1. Check for DTCs.

      Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] 

    2. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] 

    3. Recheck for DTCs. Based on the DTCs output in the first step, try to force output of the pre-collision system DTCs by simulating the conditions indicated by the DTCs.

      Result

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

    Result: 

    GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2015 - 08/2019]  

    Result: 

    See step  5

  5. PROBLEM SYMPTOMS TABLE 
    1. Refer to Problem Symptoms Table.

      Refer to PROBLEM SYMPTOMS TABLE [08/2015 - 08/2019] 

      Result

      Result Proceed to
      Fault is not listed in problem symptoms table A
      Fault is listed in problem symptoms table B

    Result: 

    See step  7

    Result: 

    See step  6

  6. OVERALL ANALYSIS AND TROUBLESHOOTING* 
    1. Terminals of ECU

      Refer to TERMINALS OF ECU [08/2015 - 08/2019] 

    2. Data List / Active Test

      Refer to DATA LIST / ACTIVE TEST [08/2015 - 08/2019] 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  7

  7. ADJUST, REPAIR OR REPLACE 
    NOTE:
    • When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.

      Refer to ADJUSTMENT [08/2015 - 08/2019]

    • w/ Lane Departure Alert System:

      When the lane recognition camera sensor assembly is replaced with a new one, adjustment of the camera sensor beam axis must be performed.

      Refer to ADJUSTMENT [08/2015 - 08/2019]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  8

  8. CONFIRMATION TEST 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    END