disconnected battery, stereo needed code, input code, stereo now works but airbag warning light started flashing, found out how to get it to flash fault code, (18) but have no idea what this code means and cannot find it anywhere on google etc. do you know what this code is telling me and what to do about it. If you can help me i will be more than happy to make a substantial donation as im sure it will be cheaper than the garage.