How Power Memory Seats Work

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Here's a look inside a power memory seat and how it works on your car.


The seat mechanism consists of 4 adjustments: fore and aft, front tilt, rear height, and recline. These are all powered by an electric motor connected to a spiral gear. The gear-set provides a torque multiplication as well as precise positioning of the seat.


The memory function is held in a seat control ECU, under the seat. A hall effect encoder is connected on either end of the motor to count the number of turns relative to the seat's current position. This is stored in the seat control ECU. When activated, the seat control ECU will turn the motor until the number of turns has elapsed, bringing the seat back to the perfect position for the driver.


The seat also contains an airbag attached to the seat frame. The cushion is comprised of injected molded foam, with embedded wires to which hog rings attached the upholstery. A heating pad provides warmth for the heated seat function.



The seat torn down in this video was from a 1999 Lexus ES300.


Here's how to swap car seats to a power memory seat:



Here's how seat belts work:



Soup up your car seat with these accessories:
Heated seat pads:
(US)
(Canada)
Power seat motors:
(US)
(Canada)
Car seat covers:
(US)
(Canada)
Seat belts:
(US)
(Canada)

This is the Camera I use:
(US)
(Canada)

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