Thin gauge black wires bundled in garage

[dunnah01]

I noticed a few vans at the NEC with a coil of thin gauge black wire clipped to the garage wall. Does anybody have any idea what they are for?
$0ds law I didn't take a picture but I think I have something similar in my van but hidden away. I thought they were remnants of an old alarm system it something on our van but now think they may be something factory fitted

 

[Spriddler]

Does the end appear to be connected to anything e.g disappearing through a panel, or does one end of the coil just dangle free?

 

[dunnah01]

Does the end appear to be connected to anything e.g disappearing through a panel, or does one end of the coil just dangle free?

Both ends seem to disappear into the wall panel although quite hard to tell

 

[Cush]

Receiver for something?

 

[enark]

On Rapidos, they are possibly for alarm sensors, but no longer required as it works by bluetooth?

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