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Hello,
So since I bought my e60 2008 LCI i'm having an issue with the key fob unlock/lock range,i changed the battery in it and everything,what i noticed is when I take out the diversity module and heat it up then put it back it works fine but after exactly 2 minutes when it cools down it stops working and I have to get near the rear windshield or driver's doors to unlock/lock the car. I tried reflowing micro controllers on it like: "TDA 5210" "NECJAPAN 12233766A" even the FM "TDA 15761" but nothing,after it cools down it returns to the same range. Does anyone here know what should I look into or try reflowing? I don't want to buy a new diversity module because what guarantee do I have that the new used diversity module won't fail me like the one i have right now? Did anyone here attempt fixing it on their own with success?
I replaced mine as well but found the used E61 modules were much more expensive than the compatible one from a 6 series. So now the oldest part in my car is from a 645ci I believe. Sucks that there is no guarantee and these do seem to be a fairly common failure item
I'm using a SMD rework station with a adapter for the heat gun to make sure I'm not heating up everything around and setting it to 320 celsius and also adding flux.In the mean time I found a video of some russian guy fixing the diversity module and so far all I could figure out from his video is that I might need to replace 3 parts: the quartz transistor on the left side of the TDA 5210, EPCOS 3570 below the TDA and also a small black transistor right next to the EPCOS,because those things most likely go bad in those modules so I'm gonna give it a try but I'm still open to suggestions on what else it could be.
bmw e60 diversity module key fob range fix
