2007 Lexus ES 350FACTORY OEM SERVICE PROCEDURE

Problem Symptoms Table

HINT:

  • Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
  • Inspect the fuses and relays related to the system before inspecting the suspected areas below.

    PUSH-BUTTON START FUNCTION: 

    PROBLEM SYMPTOMS TABLE

    Symptom Suspected Area See
    Power does not turn on (neither ACC nor IG is possible). 1. AM2 Fuse POWER SOURCE MODE DOES NOT CHANGE TO ON (IG AND ACC) 
    2. Engine Switch -
    3. Wire Harness or Connector -
    4. Smart Access System with Push-button Start (Entry Function) -
    5. Main Body ECU (Instrument Panel J/B) -
    6. Certification ECU -
    7. ID Code Box -
    8. Steering Lock ECU -
    Power is not turned on (only ACC is not turned on). 1. AM2 Fuse POWER SOURCE MODE DOES NOT CHANGE TO ON (ACC) 
    2. ACC Relay -
    3. Wire Harness or Connector -
    4. Main Body ECU (Instrument Panel J/B) -
    PROBLEM SYMPTOMS TABLE

    Symptom Suspected Area See
    Power is not turned on (only IG is not turned on). 1. AM2 Fuse POWER SOURCE MODE DOES NOT CHANGE TO ON (IG) 
    2. IG1 Relay -
    3. IG2 Relay -
    4. Wire Harness or Connector -
    5. Main Body ECU (Instrument Panel J/B) -
    Engine does not start. 1. Smart Access System with Push-button Start (Entry Function) ENGINE DOES NOT START 
    2. Engine Switch -
    3. Shift Lock Control ECU -
    4. STOP Fuse -
    5. Stop Light Switch -
    6. Electrical Steering Lock Function -
    7. ST Cut Relay -
    8. Park/Neutral Position Switch -
    9. ST Relay -
    10. ECM -
    11. Engine immobilizer System -
    12. Main Body ECU (Instrument Panel J/B) -
    13. Wire Harness or Connector -
    Engine switch indicator light does not come on. Engine Switch Indicator Light Circuit ENGINE SWITCH INDICATOR CIRCUIT 
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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