Originally Posted by Overboost

Ok guys I may be back to my original fuse 74 battery drain issue.

Everything seemed to be working for a day but last night before going to bed, I checked on the X5 in the garage and the system was awake. It had been at least 6 hours since I parked it so there should have been no reason it should have woke up. I pulled the codes from the TCU with BMW Scanner PA Soft 1.4 and posted the screenshot below. I did clear the codes and they came back empty but checked it again today after running errands and both are back.

My first thoughts are the replacement TCU I got off fleaBay has the same issue my last TCU did (if that is actually the problem). However, the odds are stacked against 2 identical issues with 2 separate TCU modules. I read on a previous post of yours from several years ago where you listed fuse 74 destinations:

• Telematics Control Unit (TCU) or Universal Electronic Charging & hands-free unit (ULF)

• Voice Input

• Eject Box

• Compensator

So, any advise on checking these other devices that may randomly wake the system up and cause the NAD Transceiver Failure or did I just match the odds of winning the lottery and get another failed TCU? I did disconnect the 2 devices I have on the iBus that are not OEM BMW (Dice and ModLight2) so I am still diagnosing. Again, everything is working perfect with the Bluetooth, voice command and TCU so I am not sure why is lists a TCU failure. Any thoughts would truly be appreciated.