Disconnect Battery first.
I think if you disconnect the wiring from the back of the air bag unit in the steering wheel it may start.but you have to unbolt the unit I think they are 10mm but could be torx screws I cant remember exactly, which you should have a 10mm in the onboard tool kit.... if however it looks like it needs a special tool Take a long skinny flat head screw driver and insert it in the small hole on the back side of center spoke. Have the narrow edge of the screw driver pointed toward you as you sit in the driver's seat not the wide flat of the screw driver. Tilt the head of the driver toward you a little (handle toward the dash. Push the driver in until you feel a springy resistance (you are trying to depress a spring). Push the driver toward the sky against the spring and you will see one side of the bag pop out-continue pressing harder and the other side will release. Remove the color coded connectors on the back of the bag. Any BMW involved in an airbag deploying accident needs to have the airbag controler unit replaced. Dealer will need to clear SRS system fault to turn out the airbag light.
If it still wont start after that disconnect the battery for 20 mins.
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Last edited by marti5; 01-22-2010 at 08:51 AM.