on the left side of the car (beside the seat at floor level, under the carpet) there is a sheet metal plate which protects wires running from front to back. They are spot welded to the floor on tabs. The plate can be bent out to gain access to the wiring, however on some cars, the tabs can break, however most of the time they are fine and can be used for years. You can also make one if yours is gone or you want something different.