This part is mounted in the cavity behind the passenger side tail light housing (you remove the tail light for access)- When mounted correctly, these are supposed to plug in downward, but occasionally people remount them so that the control unit faces upward- If you find yours mounted with unit facing upward, correct it as moisture tends to collect in them when installed incorrectly. New ones disappeared a few years ago. We are pleased to be offering these rebuilt units. These rebuilt units have been inspected to determine if they are a suitable candidate for rebuild, disassembled, repaired, "hardened", assembled, and re-tested. The folks rebuilding these use new components as needed - and they have added a silicone coating to the rebuilding process to reduce the likelihood of future water damage.