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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 03-07-2013, 04:19 PM   #1
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Volute Spring. What is it?

Doing some reasearch on e46 wiring and found something called "Volute Spring" on WDS its part I01002 (E46 WDS here)
As far as I can tell it is connected to K Bus, DDE/DME, I-Bus, multiple restrain system, and finally multi-function steering wheel.

So does anyone know what it is, or what it might be?
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Old 03-07-2013, 05:57 PM   #2
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It's a flex cable connecting parts on the moving part of the steering wheel with the rest of the car (airbag, cruise buttons, radio/phone controls and horn.).

Last edited by scottjoh; 03-08-2013 at 11:28 AM.
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Old 03-07-2013, 07:18 PM   #3
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Hope this is the correct one.
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Old 03-07-2013, 07:23 PM   #4
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Correct. It's also known as a clock spring or slip ring.
It allows components that rotate about a central axis to maintain electrical contact with a fixed element without twisting a wiring harness.

On an E46, the volute spring is the slip ring that allows the steering wheel to connect to the harness.
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