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.
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HOMESERVICE MANUALSTOYOTA2009SIENNA XLE, FWDREPAIR AND DIAGNOSISBODY & FRAMESEATSFRONT POWER SEAT CONTROL SYSTEMPROBLEM SYMPTOMS TABLE
2009 Toyota Sienna XLE, FWD
Problem Symptoms Table
2009 Toyota Sienna XLE, FWDSECTION Problem Symptoms Table
HINT:
- Inspect the fuse and relay before confirming the suspected areas in the table below.
- Inspect each suspected area in numerical order for the corresponding symptom.
If the malfunction still exists after checking and confirming that all circuits and components are normal, replace the ECU.
FRONT POWER SEAT CONTROL SYSTEM (w/o MEMORY)
PROBLEM SYMPTOMS
| Symptom | Suspected area | See |
|---|---|---|
| Power seat does not operate (slide, front vertical, lifter, reclining). | IP/SEAT fuse | - |
| 2. Power seat switch | POWER SEAT SWITCH | |
| 3. Wire harness or connector | - | |
| Slide operation function only does not operate. | 1. Power seat switch | POWER SEAT SWITCH |
| 2. Front seat frame with adjuster (LH side slide motor) | FRONT SEAT FRAME WITH ADJUSTER | |
| 3. Front seat frame with adjuster (RH side slide motor) | FRONT SEAT FRAME WITH ADJUSTER | |
| 4. Wire harness or connector | - | |
| Front vertical operation function only does not operate. | 1. Power seat switch | POWER SEAT SWITCH |
| 2. Front seat frame with adjuster (LH side front vertical motor) | FRONT SEAT FRAME WITH ADJUSTER | |
| 3. Wire harness or connector | - | |
| Lifter operation function only does not operate. | 1. Power seat switch | POWER SEAT SWITCH |
| 2. Front seat frame with adjuster (LH side lifter motor) | FRONT SEAT FRAME WITH ADJUSTER | |
| 3. Wire harness or connector | - | |
| Reclining operation function only does not operate. | 1. Power seat switch | POWER SEAT SWITCH |
| 2. Front seat frame with adjuster (LH side reclining motor) | FRONT SEAT FRAME WITH ADJUSTER | |
| 3. Front seat frame with adjuster (RH side reclining motor) | FRONT SEAT FRAME WITH ADJUSTER | |
| 4. Wire harness or connector | - | |
| Lumbar support operation function only does not operate (Driver side only). | 1. Front power seat lumbar switch | FRONT POWER SEAT LUMBAR SWITCH |
| 2. Lumbar support adjuster assembly | LUMBAR SUPPORT ADJUSTER ASSEMBLY | |
| 3. Wire harness or connector | - |
FRONT POWER SEAT CONTROL SYSTEM (w/ MEMORY)
PROBLEM SYMPTOMS
| Symptom | Suspected area | See |
|---|---|---|
| Power seat does not operate (manual or memorized position). | 1. ECU power source circuit | ECU POWER SOURCE CIRCUIT |
| 2. Position control ECU and switch assembly (power seat control switch and ECU) | - | |
| One of the power seat functions does not operate (manual or memorized position). | 1. Power seat motor circuit | POWER SEAT MOTOR CIRCUIT |
| 2. Position control ECU and switch assembly (power seat control switch and ECU) | - | |
| One or all manual seat functions do not operate (memorized positions OK). | 1. Position control ECU and switch assembly (power seat control switch | - |
| Memory function does not operate. | 1. Memory switch circuit | DRIVING POSITION MEMORY SWITCH CIRCUIT (W/ MEMORY) |
| 2. Multiplex communication system | - | |
| 3. Position control ECU and switch assembly (power seat control switch | - | |
| No memory functions operate or all memory functions operate briefly | 1. ECU power source circuit | ECU POWER SOURCE CIRCUIT |
| 2. Position control ECU and switch assembly (power seat control switch | - | |
| One memory function does not operate or operates briefly and then stops | 1. Front seat frame with adjuster (power seat motor) | FRONT SEAT FRAME WITH ADJUSTER |
| 2. Position control ECU and switch assembly (power seat control switch | - |
RENDER: 1.0x
NO RELATED
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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.