My two year old BMW battery is dead on a 02/2004 build X5...
Performing SIB 61 08 00 "Closed Circuit Current Measurement " shows 286 milliamps being drawn once the 16 minutes have elapsed and the vehicle goes into sleep mode. It should be less than 40 milliamps. While still measuring current, pulling Fuse 74 immediately drops the current to 21 milliamps. This tells me my Everest TCU is not powering down.

Looking at the 45+ SIB's on Telecommunications I only found SIB 84 01 04 which states the following:

SUBJECT
Service Action: Check and Replace TCU
MODEL
E46 (3 Series), E85 (Z4), E53 (X5), E83 (X3)
SITUATION
Low ambient temperatures (below 32°F) may cause the TCU (Telematics Control Unit) to go into reset mode.
The result is that calls to BMW Assist or "SOS" calls will not be completed.
Once in reset mode, the TCU will remain in this condition even with the ignition turned off. This could result in a discharged battery.
This Service Action will check the TCU and replace it if necessary.
...
AFFECTED VEHICLES
This Service Action involves E46 (3 Series), E85 (Z4), E53 (X5) and E83 (X3) vehicles which were produced from 8/2003 to 11/2003.


Has anyone found any SIB which indicates more recent TCU's have issues powering down? If the The Non-Volatile Memory (NVM) within the TCU has been corrupted (see SIB 84 07 07) can this cause it to not powerdown?

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2010 X5 3.5d: SOLD, but miss the torque...
2004 X5 4.4i: SOLD, but served us well