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The blue plug, I do believe is for the back up sensor on/off.
I pulled that specific switch plate out of an 03 Eddie in the junk yard that had back up sensors, when I pulled the plate off of my 00 Limited I to had the blue plug that fit the the switch for the back up senors switch that came from the 03 Eddie
Look in the tech folder for how to get your door code.
You cannot see it unless you use a small mirror attached to a stick about 14" long. The sticker has 5 numbers on it the you will view in a reverse order of how the will need to be put in.
There is that white batting that needs pushed aside and it is on the vicinity of the stereo up under the dash.
I was able to get mine by putting cell phone up there and taking a pic. It took about 3 times to get it postioned correctly, but it did work. And I think the other plug would be for backup sensors.
Dealer.
