2005 Lexus LS 430FACTORY OEM SERVICE PROCEDURE

How To Proceed With Troubleshooting

HINT:

The hand-held tester can be used in steps 3, 4, 5 and 7.

  1. VEHICLE BROUGHT TO WORKSHOP 
  2. See  CUSTOMER PROBLEM ANALYSIS CHECK   ) 
    1. Confirm problem symptoms.
  3. CHECK MULTIPLEX COMMUNICATION SYSTEM (See  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
    1. Check for DTCs.
    DTC OUTPUT RESULT TABLE

    DTC is not output. A
    DTC is output. B

    B: GO TO MULTIPLEX COMMUNICATION SYSTEM (See HOW TO PROCEED WITH TROUBLESHOOTING  ) 

    A: Go to next step 

  4. CHECK CAN COMMUNICATION SYSTEM (See  PRECAUTION  ) 
    1. Check for DTCs.
    DTC OUTPUT RESULT TABLE

    Malfunction is not detected. A
    Malfunction is detected. B

    B: GO TO CAN COMMUNICATION SYSTEM (See  PRECAUTION  ) 

    A: Go to next step 

  5. CHECK DTC (See  DTC CHECK/CLEAR   ) 
    1. Check for DTCs.
      1. Record the DTCs.
    2. Clear the DTCs.
    3. Recheck for DTCs.
    1. Simulate the malfunction and check if the DTCs are output again (see DTC CHECK/CLEAR  ).
    DTC OUTPUT RESULT TABLE

    DTC is output. A
    DTC is not output. B
    DTCs are not output, and the malfunction can not be simulated or checked. C

    B: Go to step 10 

    C: SYMPTOM SIMULATION (See  HOW TO PROCEED WITH TROUBLESHOOTING  ) 

    A: Go to next step 

  6. DTC CHART (See  DIAGNOSTIC TROUBLE CODE CHART   ) 
  7. CIRCUIT INSPECTION (See  DTC B2000 RIGHT SIDE MOTOR LINE MALFUNCTION HI   TO  DTC B2064 VEHICLE TYPE SIGNAL MALFUNCTION   ) 
  8. REPAIR 
  9. CONFIRMATION TEST 

    END 

  10. See  PROBLEM SYMPTOMS TABLE   ) 
  11. ADJUST, REPAIR OR REPLACE 
  12. CONFIRMATION TEST 

    END 

Factory Service Tools

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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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