MSD85 and MSD85.1 Engine computer Unit (ECU)
Engine computer Units (ECU) Siemens MSD85 and MSD85.1 are used to control
N63B44 (N63B44O0)
N63TU aka N63B44TU (N63B44O1)
S63 (S63B44O0)
S63TU (S63B44T0 )
This Siemens MSD85 and MSD85.1 are used in for N63 Engines in
BMW 550i F10/F11
BMW 650i F12/F13
BMW 750i/750Li F01/F02
BMW X5 F15
BMW X6 F16
BMW 550i GT F07
BMW X5 E70
BMW X6 E71
Also, Siemens MSD85 and MSD85.1 areused in S63 Engines in
BMW M5 F10
BMW M6 F13
BMW X5M F85
BMW X6M F86
BMW X5M E70
BMW X6M E71
Problem with MSD85 and MSD85.1
MSD85 and MSD85.1 are known for internal failure that causes disturbing BSD (Bit Serial Data) communication.
BSD is a bit-serial data interface is a single-wire data bus with a data transfer rate of 1.2 kBd. It's 12V signal level, 830uS = 1200 baud.
Codes for F series are:
00278D - BSD, Alternator : Missing
CD9304 - BSD Data bus communication fault
210901 - BSD, Message; Alternator; Missing
213901 - Power management: reduction or deactivation of individual electrical loads/consumers
After Failure, only way to fix it was to replace DME, that's what dealer offers, and cost is around $2200
SOLUTION
We offer repairing internal failure of MSD85 and MSD85.1. Please feel free to ask questions.