Or, sorry, it could simply be that the seat connector has not connected properly, disconnect the connector and re-connect it a few time and make sure there's no debris in the connector.
If that doesn't cure it follow my post above
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2011 Focus 3-door Zetec 1.6 TDCi.
Previous <img src="/images/graemlins/stemo.gif" alt="" />s - 2006 Panther Black & 2007 Red. Gone and quite forgotten <img src="/images/graemlins/lol.gif" alt="" />