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When I had my Laguna I it also suffered from water leaking in from the aerial getting into the central locking circuit. When it dries out it does work.
When this does dry out, it may be prudent to try and put some sealent round the aerial base (from inside) to stop the water leaking in. I also wrapped my central locking circuit board in plastic to stop it getting wet, worked a treat.
I never had a problem with the immobiliser though when the central locking stopped working.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo