Parking sensor

[Buzarpy]

Parking sensor not making a noise when put in reverse, did a diagnostic and the fault was. 

Parking aid warning buzzer open circuit or short. 

Now I noticed on the forum some lovely guidance on where the buzzer is situated, however we have a soft top and I've tried looking as best I can where the roof goes but alas nothing found. 

Is there anyone out there to help. 

Thanks