While cleaning my 320 coupe I noticed a wire plug that had become disconnected from the black box under my drivers seat. It came out of the socket that was on the far side of the box closest to the passenger seat. Is this box the seat controller???

Also noticed another loose wire that had a phone type connector obn the end - but the connnector looked more like type used for computer network hookups. Anyone tell me what this wire is for (diagnostics??) Should it be plugged into the black box under the drivers seat??