Seat belt tensioner : Control box

The control box contains all the electronic for the GT seat belt tensioner, and allows to make it automatic.

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  1. Presentation
  2. Shopping list
  3. Instructions de montage


The 3D files are available on Thingiverse

Shopping list

A part of the components is already part of the seat belt tensioner list, these are the power supply, the motor driver and the Arduino. Here are the components that are specific to the control box :

  1. A relay (Aliexpress, Amazon).
  2. A 24V – 12V converter (read the documentation to adjust the output to 12v) (Aliexpress, Amazon)
  3. 12V 120mm PWM Fan (4fils) (Amazon)
  4. Power supply male socket (Aliexpress)


IMPORTANT : The harness tensioner can be dangerous. At full power, it is very stressfull around the collarbones. It is therefore necessary to provide an emergency stop button.

Make all the connections with the power off.

Do all electronic tests without any parts on the shaft.

Once the tests have been carried out, and the belt installed, carry out the tests in 10% power increments.



I've been passionate about cars since I was a kid! I learned the multiple variations of the Skyline R34 through the Gran Tursimo series, until I discovered GTR2 at the wheel of a keyboard. A few years later, I plunged back into Sim Racing with a G27 which made me enter the DIY world. Always looking for an immersion out of reach in reality, I develop projects that I take care to make accessible to any 3D printer owner!
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3 thoughts on “Seat belt tensioner : Control box

  1. Hola desde españa!

    Hay en algun lugar un esquema electrico? no me queda claro las conexiones de los cables en el video.

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