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.
2012 Toyota Prius TwoFACTORY OEM SERVICE PROCEDURE
Problem Symptoms Table
HINT:
- Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, 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 this system before inspecting the suspected areas below.
FRONT POWER SEAT CONTROL SYSTEM
| Symptom | Suspected Area | See |
|---|---|---|
| All functions do not operate | Front power seat switch LH | Refer to INSPECTION |
| Wire harness or connector | - | |
| Only slide function does not operate | Front power seat switch LH | Refer to INSPECTION |
| Slide motor (separate type front seat cushion spring assembly) | Refer to INSPECTION | |
| Wire harness or connector | - | |
| Only front vertical function does not operate | Front power seat switch LH | Refer to INSPECTION |
| Front vertical motor (separate type front seat cushion spring assembly) | Refer to INSPECTION | |
| Wire harness or connector | - | |
| Only lifter function does not operate | Front power seat switch LH | Refer to INSPECTION |
| Lifter motor (separate type front seat cushion spring assembly) | Refer to INSPECTION | |
| Wire harness or connector | - | |
| Only reclining function does not operate | Front power seat switch LH | Refer to INSPECTION |
| Reclining motor (separate type front seatback assembly) | Refer to INSPECTION | |
| Wire harness or connector | - | |
| Only lumbar support adjustment function does not operate | Power seat switch assembly | Refer to INSPECTION |
| Front power seat switch LH | Refer to INSPECTION | |
| Lumbar support adjuster assembly (separate type front seatback assembly) | Refer to INSPECTION | |
| Wire harness or connector | - |
Factory Service Tools
Use the Manual With the Right Hardware
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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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