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61 13 ... Base Of Tab Connector Housings
WARNING: This page is about a different car, the 2007 BMW 550i and 2006 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.
Unlock hook (1) with special tool 61 1 360
and slide plug housing downwards out of base.
Courtesy of BMW OF NORTH AMERICA, INC.