I have recently experienced a similar issue with my 2002 Laguna II Estate.
Local Renault dealer tested the system and suggested problem was simply the buzzer, which would "only" cost £43 + VAT to fix.
Knowing 12v buzzers cost no more than £3 it should be an easy fix, but cannot locate the buzzer on the car. Please can anyone advise? Appreciate previous response suggests alongside the reversing module (?) but where is that
Any assistance with locating either of the above would be most appreciated.