Description

BMW MSD85.1 BSD FAULT REPAIR | X5 X6 E70 E71 4.4L N63 DME ECU ECM

Mail-in Repair service for your MSD85 Family DME for repair of the BSD Fault

MSD85 and MSD85.1 ECU

Engine computer Units (ECU) Siemens MSD85 and MSD85.1 are used on the following engines:

• N63B44 (N63B44O0)

• N63TU aka N63B44TU (N63B44O1)

• S63 (S63B44O0)

• S63TU (S63B44T0 )

Problem with MSD85 and MSD85.1

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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.

When it happens DME loses communication with alternator, oil level sensor and other modules on BSD Bus. Therefore it is not possible to measure oil level and alternator does not charge battery anymore.

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 $220