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.
Rear Power Seat Control System (Initialization)
The position sensor initialization must be performed if one of the following occurs.
- Position control ECU is replaced.
- Rear seat adjuster is replaced.
- Initialization cancel operation is performed.
- Power seat motor for the rear right side seat is operated when D/C CUT1 fuse or D MPX-B 1 fuse has an open circuit.
- Power seat motor for the rear left side seat is operated when D/C CUT2 fuse or RR MPX-B 2 fuse has an open circuit.
- Power seat motor inspection is performed.
HINT:
The initialization is only performed for the seat selected with the left / right selection switch.
- Initialization cancel operation
- Turn the power switch ON (IG).
- Press the rear power seat switch upper lumbar switch rearward 3 times.
- Within 10 seconds of the above operation, begin the following operation: perform the downward headrest operation and forward slide operation simultaneously for 10 seconds or more. This will cancel the initialization (buzzer sounds for 0.5 seconds).
- Initialization operation
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
HINT:
*: for Ottoman
- Perform the initialization cancel operation.
- Use the slide operation to move the rear power seat to the rearmost lock position.
HINT:
While performing the slide operation, the buzzer sounds.
- Use the reclining* operation to move the rear power seat to the rearmost lock position (buzzer sounds for 0.1 seconds).
- Use the ottoman* operation to move the rear power seat to the lowermost lock position (buzzer sounds for 0.1 seconds).
- Use the upper lumbar operation to move the upper seatback to the rearmost lock position (buzzer sounds for 0.5 seconds). The initialization is complete.
- Operate the power seat switch and check that the seat slides forward and rearward and that the beeping sound is not emitted.
HINT:
- After performing all of the procedures above, if the buzzer sounds while performing a manual operation, perform the front power seat initialization for the front passenger seat*.
- After performing all of the procedures above, if the buzzer sounds while performing a manual operation, the initialization was not completed properly. Repeat all of the above procedures.
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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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