I recently took the rear seat out of my '86 300E to vacuum the car out. I was lifting the foam to see if there was any junk under it and I noticed that there was a disconnected wire under the seat. The wire goes to a cylindrical box that measures about 6 inches in diameter and it's about 5 inches tall. It has 3 copper wires coming out of it that connect to the harness. What is this device and what does it do? Is it ok that the wires were disconnected?