Depends. Do you have an SES module?
(mine is black)

ULF - BT plus voice control of nav and phone
TCU (post 2005 ish) - BT plus BMW Assist, plus voice control of phone
SES - voice control of nav and phone (blue plug)

ULF with SES will fight, SES with TCU with voice enabled will fight.


Navcoder can disable voice control in TCU or ULF.

SES jumper can be used and SES module sold.