No dash acknowledgement in North America. Not sure about Oz.

If pdc is still beeping I would check if the trailer lights work

If not your vehicle may require flashing by the dealer so the vehicle recognizes that the trailer wiring module is installed. You don't list your vehicle details but it was 2004 models onwards that may need flashing, IIRC

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue