Disabling System
WARNING: This page is about a different car, the 2003 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.
Before proceeding, see AIR BAG SAFETY PRECAUTIONS . Retrieve and record any fault codes. Obtain radio anti-theft code. Record programmed radio stations. Ensure ignition is off. Disconnect and shield the negative battery cable. Wait at least 5 seconds before servicing vehicle.