Can anyone who has the workshop manual please check what the harness # is called? I have a RHD and the only harness that sounds remotely correct (R192, description "seat buzzer") appears to be in a different location.
If sitting in a LHD car, the workshop manual desribes the harness to be under the passenger seat and forward of all the airbag connectors, close to the door side of the seat. This diagram does not show the harness to be in a different location even for RHDs hence the confusion.
The harness described in the OP according to my diagram is black coloured, under LHD driver's seat, close to door side and labelled as R09 "power seat".