2003 Caravan harness under fuse box not connected

2003 Base Caravan - I had to replace the bracket that holds the fuse box in place due to a dealer who broke it when repairing a short. They also improperly installed the relays so I decided to replace it myself before they break something else! Why is there a extra blue wiring harness plug left hanging under the fuse box? When I removed the fuse box from the bracket all of the harness plugs were connected to the underside of the fuse box with the exception of 1. I do not see any open female recepticles where this can be plugged into on the underside of the box. Could this be for an accessory that the base model does not have? I have had several electrical problems that are now fixed and I wondered if this was a cause for concern. Thanks a lot!

Does anyone know where I can get this information on the web?
Thanks
PFE

think you need to buy the manual. it will explain what wire colors do what in that harness. very likely for a option you don't have since they are all pre wire for all options. good luck