neilrr010 Posted May 16 Share Posted May 16 Greetings everyone, my car is in pristine shape, a 2007 5.25d M Sport, likely in showroom condition visually. The vehicle is maintained on a reliable trickle charger during the winter months and is stored undercover, as it is not utilised in inclement weather, for around three months. The alternator and new battery have been inspected and reprogrammed by a BMW garage. However, both remotes have ceased to operate the central locking once more. This is not the first occurrence; they seem to lose their coding, despite the previous reprogramming being executed correctly. All functions operate correctly once inside the vehicle; entrance was gained using the manual key. The alarm is malfunctioning, although all internal buttons function properly, indicating that relays are operational, except for the central locking via the remotes. Any assistance or guidance would be much valued. Quote Link to comment Share on other sites More sharing options...
coolguy Posted May 16 Share Posted May 16 The alarm will activate if a manual entry is performed prior to inserting the key, indicating a potential malfunction in the diversity antenna module. Quote Link to comment Share on other sites More sharing options...
neilrr010 Posted May 16 Author Share Posted May 16 I hope you are mistaken; but, I shall explore other more expedient alternatives initially. Nonetheless, my intuition aligns with your recommendation. Thank you. This is not the first occurrence; previously, when my car battery in the trunk was malfunctioning, I had a new one installed, necessitating the reprogramming of both remotes. Everything functioned optimally for a period, and the new battery is currently on an excellent trickle charger. However, it is becoming increasingly frustrating, as I have inspected every fuse, among other components. Is there a method to verify the diversity antenna, as all other components in the vehicle appear to function well despite my repeated attempts? Thank you Quote Link to comment Share on other sites More sharing options...
coolguy Posted May 16 Share Posted May 16 The footwell body control module may also be defective; do a diagnostic scan for DTC to obtain further information. Quote Link to comment Share on other sites More sharing options...
neilrr010 Posted May 16 Author Share Posted May 16 I will attempt that as well; thank you very much. Quote Link to comment Share on other sites More sharing options...
torque2me Posted May 16 Share Posted May 16 The battery in the key is depleting. The fob for my 2007 contains a rechargeable battery that charges while in the slot. They are not eternal. Quote Link to comment Share on other sites More sharing options...
coolguy Posted May 16 Share Posted May 16 Thank you, @torque2me. I completely overlooked that. Indeed, there are individuals on eBay that offer battery and switch replacement services. I would recommend sending it off for repair before considering a transition to a diversity antenna and BCM. Quote Link to comment Share on other sites More sharing options...
neilrr010 Posted May 16 Author Share Posted May 16 Thank you for your response, torque2me. Initially, I considered that possibility. Both remotes had fresh batteries installed two months ago; however, one ceased functioning, prompting me to replace both batteries while I was re-soldering. I tested both remotes, and they operated correctly. As previously stated, it has remained undercover while the salt is present. However, it has been started and operated (still undercover and not driven) with both keys for approximately 30 minutes each time at speeds above idle to circulate the oil and water in the engine, both functioning adequately. Subsequently, a week later, both remotes ceased to operate simultaneously. Quote Link to comment Share on other sites More sharing options...
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