I have a 2000 E46 318i & have lost the use of my r arm. I use a remote control on my steering wheel to override the indicator,high beam windscreen washers etc by connecting the relays in parallel with the various switches.
However this new bmw has a computer (gmc?) & rather than a 12v live & switch-wire arrangement. it has a signal wire in-out system (looking at the wiring diagrams it looks like a resistor changes the signal values inside the various switches).
Does anyone know how the signals are converted?(resistor values,chips or are they just normal switches) as i am afraid of testing with a mutimeter or shorting out signal in & signal out cables(blue & white for indicators?) in case i blow up what is probably a very expensive part.
does anyone know the colours of each cable & its function for the wiper , indicator switch & horn
I would be extremely great-full for any help with this problem
just been thinking overnight(gawd it hurts) that the electronic signals must be converted to +12v at some point before reaching the bulbs/horn etc.
Im guessing the output of the light switching center could be 12v-can anyone confirm this?