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Not sure what part you are talking about... the Door control Module (DCM) is located behind the door panel, between the panel and the door skin.
It is not visible with the panel on and doesn't have any lights on or on it.
Could be several things including bad switch or no power inside the door for the switch light circuit or bad ground. Not as likely that all the bulbs are bad but could be. They can be replaced.
Can help you later with diagnostics but rather busy and not at home now.