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Hello, I am Jose Sebastian. Your automotive expert, It's a pleasure to me to attend your question. Thank you very much for trust in just answer.
Dear customer, it seems that your BMW is not configured, your BMW has a module in charge of the lights, central locking, Conford system etc... It seems that this module has gone out of configuration for some reason.
Ideally, the factory data should be reset with a diagnostic kit, also the relays and fuses should be checked and finally the BCM module should be checked for function.
If it happened after the battery was discharged, it is a simple misconfiguration, don't worry, resetting the data by means of diagnostic equipment will correct it.
It is best to go to a workshop that has diagnostic equipment with BMW software, not necessarily an agency, but a workshop that at least has multi-brand diagnostic equipment.
I hope this info to be helpful, my goal is to give you the best advice i can, I hope to be helpful, if you have any doubt or want to know anything else please do not hesitate to reply back.
Kind regards, Sebastian.