funtion of part???

[911ballin]

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Ok i trying like crazy narrow a problem! basic I think my interior light is always on if I put them in automatic setting after closing door
i THINK PROBLEM IS MAIN LATCH or sensor
TRY TO UNDERSTAND SYSTEM !!!
BUT BEFORE ORDER NEW latch !!!
i'M TRING TO UNDERSTAND HOW SYSTEM OF LIGHT AND DOOR OPEN AND CLOSE WORKS! So looking and diagrams i found this part!
98663212112 said light ignition combine switch??? I will like to know what is function of this part?

second bad part or clue of the probklem with interior light and door lights are not going off after 10 seconds of closeing the doors, I was thinking could be a bad window micr chip>> I noted my passanger window don't come dow evrything i opne the door , i have to some times slamp the door I see window moving up down 2 mm , so maybe that microchip is telling door is openopne is not getting signal when door is close and that whay lights stay on if i leaving auto botton switch?
is a bad microchip can cause this porblem with interior light the window regulator microchip>