I just puchased this 2001 525i with 114,000 miles, it just has a couple of small issues that need to be looked at further. I have an airbag code (OB Ignition Circuit ZK 10/ Safety Battery Switch 1). I need more info on this code. Any help would be appreciated! I have tried to clear the code but it keeps comin back. Where is the safety battery switch? This is my first beamer!