The shape and color of the connector in the bottom pic, the 6 wire one, is the same as connector S24 and S25 in the 2007 EWD. If that is the same connector, then you should have 2 of them and they are for the LH and RH seat heaters and would power the harness to the seat. The wire colors are different than my EWD, but that could be just a year to year difference as your is a 05 and the EWD is for the 07. I thought it might be the air suspension but the connector shapes don't match up at all.
Maybe someone with the 05 EWD can see if the colors changed.