If the option for OBC in the instrument cluster does NOT show up in PIWIS, it's probably because the "Option Code" had not been keyed in for the DME. Go to DME and put in 986320 for a Boxster S.... Then go back out and do a full module scan, then go back to the instrument cluster and the OBC will show up.
Just went through this with my Boxster...
...joe
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