Originally Posted by bmwretrofit
It needs to be installed instead of your MULF (MULF2HI) and TCU units.
Usually these are located in the trunk.
With each Combox kit we will be offering complete installation manual will be included
The Combox Telematics needs to be programmed with all the TCU communications data -access number, VIN- to retain the Assist services.
Is that part of this Combox retrofit?