BMW tech here?

[k3tsurui]

check for spark and fuel pressure...if present, then check crank trigger or main relay....might not be your problem, but that is where i will start. or you could send the customer to a real shop


is it a factory alarm or aftermarket?

is there an override button at the bottom of the dash somewhere? (near left of steering column)

i am not quite sure i am remembering correctly but i think you put the key in and turn it to ON position, then push the override button and hold until the little key LED blinks....if all else fail then trace the starter wire until you find the ground relay and rip that shit out....aka alarm bypass the car thief way