Have a look here
https://www.kits-n-bits.com/re-coding-towing-electrics/
Looks like its for accommodating the wiring into the canbus.
(Coincidentally I am looking into this now but there are no towbar options for my car)
Cheers, that's got some great explanation. Looks like it's a big enough job that I'll just buy a new rack!
@jackbepablo started
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Have a look here
https://www.kits-n-bits.com/re-coding-towing-electrics/
Looks like its for accommodating the wiring into the canbus.
(Coincidentally I am looking into this now but there are no towbar options for my car)