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: Removing Locks

Courtesy of BMW OF NORTH AMERICA, INC.

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: Releasing Lugs (Diesel Engine Vehicles)

Courtesy of BMW OF NORTH AMERICA, INC.

Gasoline 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: Releasing Lugs (Gasoline Engine Vehicles)

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: Releasing Tabs

Courtesy of BMW OF NORTH AMERICA, INC.