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Yes I cant use any databus like canbus.
Cars used to have a D+ on the alternator (for example used to control the run engine light) but the m54 engine already has an ecu controlled alternator so that doesnt work. I measured the voltage on that d+ connector but its not DC (dc 7,5v ac 5,8v) so some kind of complex signal that also isnt set on/off with the engine.
On modern campervans they sometimes use a D+ simulator (d+ is used there also to switch a fridge on/off) and such simulators work on the battery voltage (so they swich on/off at 13.5v or so), but that is way to unreliable for my project.
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Z4 3.0i | ESS TS2+ supercharger | Quaife ATB LSD | Brembo/BMW performance BBK front/rear | Schrick FI cams | Schmiedmann headers+cats | Powerflex/strongflex PU bushings | Vibra-technics engine mounts | H&R anti rollbars | KW V3 coilovers/KW camber plates | Sachs race engineering clutch | tons of custom sh#t
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