Okay, end of thread.
I took it to Parkside BMW and they cannot reset the module. They have the diagnostic equipment but it will not read. I'll just have to live with it. In conclusion, what i have learnt is.
1. If you leave your car a while, and the battery go's flat, this can discharge the internal battery in the siren, and the alarm module MIGHT reset to the default settings. This means the alarm will auto-arm after 30 seconds. It can also screw up the siren.
2. Geting someone with the right diagnostic tools is hard. BMW main dealers may, or may not have them. If you live in Yorkshire/ Nottinghamshire Parkside BMW in Worksop are as good as anywhere. The guy was great today, even reset my airbag light and never charged me a penny.
3. If you have a siren with an internal battery, dont bother trying to change it, even for a DIY change. The internals of the siren are all glued in, its impossible.
4. If you leave the car in a garage for extended periods (months), or SORN it, take steps to make sure the battery doesn't die.
Thanks for the help.
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