Hi! A slighty different c/l problem here! Over the last few days my car has been locking and unlocking whenever it felt like it - whether it was being driven or parked up. I pulled the rear seat up and felt around under the foam insulation and found the problem - it was SOAKING WET! I loosened the RM/GM casing thingy and lifted it out of the puddle, ripped out the insulation and had a closer look. A green plug with a plastic bag cover over it had filled with water and all the contacts had turned green - crap! So I stripped the boot out as well to see if there was any water in there - yep, the spare wheel well was half full. Bailed that out, then had a look for the leak. I think I found it - some fool had drilled a hole under the boot seal (probably some dodgy alarm installer), so I filled the hole and siliconed in up for now, just to see if the leak comes back. If not then I'm stumped!!
After all this rain we've had, I hope this may help someone!
Shaun M