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Volvo V40 Changing the Alarm Siren

This information has been  gathered from personal experience and is believed to be accurate but there is no  guarantee that this is the case. Anyone using this information does so on the understanding that its use is completely at their own risk and that no legal liability of any kind will be accepted by the author for errors or  ommisions or consequential damage to persons or possessions. Prospective users  should make their own considered judgement or seek specialist advice as to the  accuracy or otherwise of any statements made before using this information in  any way.
A faulty bonnet switch  caused the alarm siren to sound continuously for many minutes until it  eventually burnt out. A replacement was  sourced  from a scrapyard for a few £s. Finding the faulty unit however was rather more  difficult.  VADIS indicated it was  behind the bonnet, no such luck, others suggested under the battery, again  not  there. Some kind Volvo Forum member suggested inside the off side wheel  arch,  third time lucky!
Getting at the device is  rather a pain as first the plastic inner wheel arch must be removed. Even with  this out of the way its position is still fairly hidden. It is located at the  top of the wheel arch behind the OS lamp unit and directly above the washer  resevoir.  The pic below shows its location after its  removal:
Picture





The siren in its steel frame  is secured by two  bolts to the rusty bracket and is awkward to remove, I had to  move the loom to get access.The unit is shown below in its mounting frame  resting on the offside  wheel:

Picture







The faulty unit was eased out of its frame (it being held by two metal tongues) and unplugged. The replacement unit was then installed. I had no idea if it would work as some siren units are coded to the 
alarm. The alarm was set and I triggered it by waving my arm hrough the open window, the siren burst into life, So all was OK. Not the easiest of jobs but at  least it was successful