I own a 06 Passat tdi s and was wondering if the alternator uses canbus at all.

I am going to be adding an additional battery which will be seperated via a split charging relay which I want it to turn on with the engine and the previous ways which i done it was feeding a remote signal from the alternator sensing cable which I can locate next to the alternator.

I don't think that it is but just wanting do double check.