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

WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 2011 BMW 328xi, 2011 BMW 328i, 2011 BMW 323i, 2010 BMW 335xi, and 2010 BMW 335i. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: DC/DC converter in vehicles with automatic start-stop function.
There are two versions:

Without additional bracket for diesel engine vehicles
With additional bracket for gasoline engine vehicles

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

IMPORTANT: Read and comply with INFORMATION ON PROTECTION AGAINST DAMAGE FROM ELECTROSTATIC DISCHARGE .

Necessary preliminary work:

Remove LOWER SECTION OF MICROFILTER HOUSING (all except M3)

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.