Under the passenger seat tucked right at the front basically under the back of the front seat is this green plug 40mm by 10mm with some wires looking like they were bridged? And melted a bit ); Mabie stuff got to hot for the PO? I dont have a manual yet.
It's the ground block. Common point of failure. You can take it apart, clean it all with a wire brush then reassemble it with dielectric grease. Or you can cut it off and splice all the wires together.