I have tow assist on my 2013 although never tried it, I assume it works as the yellow square appears looking for the tracking sticker, the only annoying thing is the front parking sensors also disable when a trailer is connected??? My L322 left them on.

It would be nice if they could be coded back on as I have a really tight zig zag reverse onto the drive when the streets full Current
2017 Range Rover Sport SVR
2001 Porsche 911 Turbo
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2013 Range Rover Autobiography SDV8
2007 Range Rover Vogue SE TDV8
2002 Range Rover HSE TD6
+ Many other non LR products

Update on this, the trailer symbol now works as I added tow bar lights module with the iid tool but had to do an ecu reset and now lost tow assist!
Cannot see how to get that back?