6142... Removing and installing/replacing DC/DC converter

NOTE: DC/DC converter in vehicles with automatic start-stop function.

There are two versions:

Depending on the equipment, one or both versions are installed in the M3

Necessary preliminary work:

Remove right upper section of microfilter housing M3

Unlock fasteners (1) from below and slide upwards approx. 10 mm.

Unlock locks (2) in direction of arrow.

Remove cover (3).

Fig 1: Unlocking Locks In Direction Of Arrow

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Diesel engine vehicles (without additional bracket):

Release lugs in direction of arrow. Remove DC/DC converter (1) by pulling upward. Disconnect plug connection (2).

Fig 2: Removing DC/DC Converter By Pulling Upward

Courtesy of BMW OF NORTH AMERICA, INC.

Petrol engine vehicles (with additional bracket):

Release lugs in direction of arrow. Remove DC/DC converter (1) by pulling upward. Disconnect plug connection (2).

Fig 3: Removing DC/DC Converter By Pulling Upward

Courtesy of BMW OF NORTH AMERICA, INC.

M3 :

Release tabs in direction of arrow and remove DC/DC converter with additional bracket (1) upward. Disconnect plug connection (2).

Release tabs in direction of arrow and remove DC/DC converter without additional bracket (3) upward. Disconnect plug connection (4).

IMPORTANT: Do not mix up plug connections (2, 4)!

Fig 4: Removing DC/DC Converter With Additional Bracket Upward

Courtesy of BMW OF NORTH AMERICA, INC.