Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2007 Lexus SC 430FACTORY 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.
Power mirror control system
POWER MIRROR SYMPTOM REFERENCE
| Symptom | Suspected area | See |
|---|---|---|
| Power retractable mirror does not operate manually* | 1. Mirror retract switch circuit | MIRROR RETRACT SWITCH CIRCUIT |
| 2. Mirror motor circuit | MIRROR MOTOR CIRCUIT | |
| Driver Side and Front Passenger Side Power Mirrors cannot be Adjusted with Power Mirror Switch | 1. Driver side junction block | TERMINALS OF ECU |
| 2. Outer mirror switch | OUTER MIRROR SWITCH | |
| 3. Wire harness | DRIVER SIDE AND FRONT PASSENGER SIDE POWER MIRRORS CANNOT BE ADJUSTED WITH POWER MIRROR SWITCH | |
| Driver Side or Front Passenger Side Power Mirrors cannot be Adjusted with Power Mirror Switch | 1. Multiplex network door ECU front LH (driver door ECU) | TERMINALS OF ECU |
| 2. Multiplex network door ECU front RH (front passenger door ECU) | TERMINALS OF ECU | |
| 3. Outer rear view mirror LH | OUTER REAR VIEW MIRROR | |
| 4. Outer rear view mirror RH | OUTER REAR VIEW MIRROR | |
| 5. Wire harness | DRIVER SIDE OR FRONT PASSENGER SIDE POWER MIRRORS CANNOT BE ADJUSTED WITH POWER MIRROR SWITCH | |
| Power Mirror Surface Position is not Memorized | 1. Multiplex network door ECU front LH (driver door ECU) | TERMINALS OF ECU |
| 2. Multiplex network door ECU front RH (front passenger door ECU) | TERMINALS OF ECU | |
| 3. Position control ECU (for driver side) | TERMINALS OF ECU | |
| 4. Position control ECU (for front passenger side) | PROBLEM SYMPTOMS TABLE | |
| 5. Wire harness | POWER MIRROR SURFACE POSITION IS NOT MEMORIZED | |
| 6, Front power seat control system | POWER SEAT POSITION IS NOT MEMORIZED | |
| Power Mirrors do not Return to Memorized Position | 1. Multiplex network door ECU front LH (driver door ECU) | TERMINALS OF ECU |
| 2. Multiplex network door ECU front RH (front passenger door ECU) | TERMINALS OF ECU | |
| 3. Outer rear view mirror LH | INSPECTION | |
| 4. Outer rear view mirror RH | INSPECTION | |
| 5. Position control ECU (for driver side) | TERMINALS OF ECU | |
| 6. Wire harness | POWER MIRRORS DO NOT RETURN TO MEMORIZED POSITION | |
| 7. Front power seat control system | POWER SEAT DOES NOT RETURN TO MEMORIZED POSITION | |
| Reverse Shift-linked Function of Power Mirrors do not Operate | 1. Multiplex network door ECU front LH (driver door ECU) | TERMINALS OF ECU |
| 2. Multiplex network door ECU front RH (front passenger door ECU) | TERMINALS OF ECU | |
| 3. Combination meter system | INDICATOR LIGHTS DO NOT ILLUMINATE | |
| 4. Wire harness | REVERSE SHIFT-LINKED FUNCTION OF POWER MIRRORS DO NOT OPERATE | |
| Mirror Heater does not Operate with Rear Defogger Switch | 1. Multiplex network door ECU front LH (driver door ECU) | TERMINALS OF ECU |
| 2. Multiplex network door ECU front RH (front passenger door ECU) | TERMINALS OF ECU | |
| 3. Outer rear view mirror LH | INSPECTION | |
| 4. Outer rear view mirror RH | OUTER REAR VIEW MIRROR | |
| 5. Wire harness | MIRROR HEATER DOES NOT OPERATE WITH REAR DEFOGGER SWITCH | |
| 6. Air conditioning system | PROBLEM SYMPTOMS TABLE | |
| HINT: *: w/ Retractable Mirror |
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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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