Originally Posted by QcMarque
yes, you'd need the key in the ignition on the 'run' position. if you wanted to not need the key (which I'd think would be a great security risk) I can look into that as well so that you'd have an on/off switch then the start button.
There are two options in the wiring of the PSS Switch. One, if you wish to shut-off the engine using the ignition/ key. The second, using the PSS switch.
Managed to get hold of some Circuit daigrams of E90 PSS switch from the local Bimmer dealer...the race is on mcQ...!!!!