"Service Action: Repair Corrosion Protection on the Trunk B+ Connector. The corrosion protection on the outside of the trunk (back of rear right-hand wheel arch) around the battery positive connector is insufficient, and leads to corrosion on the body. AFFECTED VEHICLES This Service Action involves F30 vehicles which were produced from 9/2011 to 10/2012. In order to determine whether a specific vehicle has had this Service Action completed or is affected by this Service Action, first check the B-pillar label for code number 645. If code number 645 has been punched out, the campaign has already been performed. If code number 645 has not been punched out, it will be necessary to utilize the ""Service Menu"" of DCSnet (Dealer Communication System) or the Key Reader. Based on the response of the system, either proceed with the corrective action or take no further action."
