84 10 011 Replacing emergency battery for Telematic Communication Box (TCB)
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2016 BMW 328i xDrive, 2016 BMW 328d xDrive, 2015 BMW 328i xDrive, 2015 BMW 328d xDrive, and 2014 BMW 328i xDrive. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Observe the INFORMATION ON PROTECTION FROM ELECTROSTATIC DISCHARGE
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Lift luggage compartment floor trim panel (1) by the handle (2).
Remove luggage compartment floor trim panel (1) in direction of arrow.
Open storage tray of luggage compartment floor (1) in direction of arrow.
Remove front luggage compartment floor storage tray (1).
Open lid (1).
Unlock and disconnect the connector (1).
Replace emergency battery (2).