It's all been said - if it's a genuine Volvo system then the trailer (when connected) is added to the normal bulb failure warning system. The trailer assist function of the cars stability control system is also activated (if relevant) - something that does not happen on aftermarket kits.
However... I had an issue on the MY17 XC60 with phantom alerts when using a trailer fitted with LED lights - this was fixed by using the genuine Volvo 13 pin to 7 pin adapter that came with the car (rather than the Hella one I had...)
No idea what could explain that but it restored working order...
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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