Terminal 30 shadow codes relate to the main battery voltage being too low. For instance, if you remove the battery, then replace it, then check for codes, you'll have a terminal 30 shadow code.
As for diagnosing the ride height sensor, I'll try and grab some INPA and/or PASoft screen shots for you but it won't be until the weekend - winter has arrived down here and I won't be able to get into my garage with my car (since my wife's car is in there!) until then...
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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
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