2009 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

How To Proceed With Troubleshooting

HINT: 

  • Use these procedures to troubleshoot the power mirror control system.
  • *: Use the Techstream.
  1. VEHICLE BROUGHT TO WORKSHOP 

    NEXT: Go to next step 

  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: Go to next step 

  3. INSPECT COMMUNICATION FUNCTION OF MULTIPLEX COMMUNICATION SYSTEM (BEAN)* 
    1. Use the Techstream 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 → GO TO MULTIPLEX COMMUNICATION SYSTEM 

      A: Go to next step 

  4. PROBLEM SYMPTOMS TABLE 
    RESULT

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

    B → Go to step 6 

    A: Go to next step 

  5. OVERALL ANALYSIS AND TROUBLESHOOTING* 
    1. Data List / Active Test. Refer to DATA LIST / ACTIVE TEST 
    2. Terminals of ECU. Refer to TERMINALS OF ECU 
    3. On-vehicle inspection. Refer to ON-VEHICLE INSPECTION 
    4. Inspection. Refer to INSPECTION

      NEXT: Go to next step 

  6. REPAIR OR REPLACE 

    NEXT: Go to next step 

  7. CONFIRMATION TEST 

    NEXT → END 

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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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.

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