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As far as I know, towbar electrics must have a tell tale light or warning buzzer that lights / sounds when the trailer electrics are connected and indicators are working.
I think your error, is actually a design feature!
EDIT: Could it be that the buzzer only sounds when you have a bulb failure? Have you checked the operation of all the lights on your bike carrier?
Currently in martin999's garage:
2011 (11) VW Passat 2.0 TDi SE + options in Island Grey, 2011 (11) Honda CB1000R in Pearl Cool White... oh and a 2004 (54) Secnic II 1.5dCi Dynamique in Ottoman Blue !