My 04 530i loses radio station memory and the key fob does not operate any doors/trunk. I can disconnect the battery and the forgotten radio presets will come back, but only for a few engine restarts. The key fob previously worked well and I could perform a key sync operation with the central locking. My next step is to find a tester to see if the fob transmits. Still the radio station preset thing is pointing me in a different direction.
Some background... My car came with S605 and S639 and a Bluetooth TCUM in the trunk that was never activated. The TCUM didn't want to code/talk with NCS Expert, but it did successfully update to a later ZUSB with Winkfp, which took 75 minutes with a KCan cable! I have made quite a few coding changes to the CAS and TCUM and now have working Bluetooth!
Mission accomplished?! Any advice on next steps?
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