EMU turns main relay on, without ignition on
So got problems on my m54 engine, EMU switches main relay as i put battery wires on. Even when ignition is off and car key is in my hand emu turn main relay on and as i use original bmw wiring main relay is also chargins some sensors and ignition coils so my ignition coils start to melt ... already changed 3 of them and also 3 ignition drivers in EMU until i figured out that main relay is always turned on when battery is connected... for Main relay output is used stepper motor output.
Re: EMU turns main relay on, without ignition on
I usually either rewire the main realy to work directly from the ignition power or i often install a little tiny PCB type relay in the wiring near the ECU to to operate the main relay... there might be better ways but this works reliably.