2008 Lexus LX 570FACTORY OEM SERVICE PROCEDURE

How To Proceed With Troubleshooting

HINT:

  • Use these procedures to troubleshoot the window defogger system.
  • *: Use the Techstream.
  1. VEHICLE BROUGHT TO WORKSHOP 
  2. INSPECT BATTERY VOLTAGE 

    Standard voltage: 11 to 14 V 

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

  3. CHECK CAN COMMUNICATION SYSTEM 
    1. Check if the CAN communication system is functioning normally (See CAN COMMUNICATION SYSTEM ).

      OK: CAN DTC is not output. 

    NG: Go to CAN COMMUNICATION SYSTEM  (See CAN COMMUNICATION SYSTEM )

    OK: Go to next step 

  4. PROBLEM SYMPTOMS TABLE 
    1. Refer to the PROBLEM SYMPTOMS TABLE  (See ).

      Result 

      RESULT REFERENCE

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

    B:  Go to step  8

    A: Go to next step 

  5. OVERALL ANALYSIS AND TROUBLESHOOTING* 
    1. Terminals of ECU (See TERMINALS OF ECU  )
    2. Data List / Active Test (See DATA LIST / ACTIVE TEST  )
  6. REPAIR OR REPLACE 
  7. CONFIRMATION TEST 

    NEXT: END 

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.