Hidden OBC codes

I have an 88 735iL. Can anyone help with a comprehensive list of the hidden OBC codes? I saw a reference once to checking alternator output voltage using the OBC and I'm sure there are a bunch of others. Also I know you can change the "fireup" order of the OBC. Can/will someone point me in the right direction, possibly an older post?
Thanks

OBC Codes (http://home.iae.nl/users/bts/obc.htm)

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