Could someone please identify this.....

...two-pin connector for me? This is underneath the front passenger side floor carpeting on my '91 300E. It is 2 white wires connecting to a brown and a black/red wire. The part #'s that house these pins are 012-545-84-28 and 012-545-86-28. Found standing water down here and this connector got corroded, have no clue what it is. Car runs fine in this state, but could be the cause of my check engine light illuminating.

TIA