Whilst looking for a runaway screw under my passenger seat I found this also, but unsure to what it is. My first thoughts were that it could be the Bluetooth for the standard headunit but not 100%.

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Seat sensor for lighting the seatbelt reminder light?

Heated seats?

anything to do with side airbags etc?

Just guessing...

Is it ticking?

Kaboom

If it's got a yellow connector, it'll be something to do with the SRS system.

+1 for side airbag connector block.

Does it have to/should it be hanging that low? Surely someone will be kicking that if they sat in the back?

Superfast broadband maybe?

Do not cut the red wire!!!

Does it have to/should it be hanging that low? Surely someone will be kicking that if they sat in the back?

 

Same on all Fabias - and no one can kick it because in front of the rear passenger feet area there is a raised lip that prevents feet going any further and that is where you harness is.