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2002 Chevy Express 5.7 3500 dome/ box light

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Anybody have experience with this?The dome & box lights wont work manually or with door switch. I have replaced headlamp combo sw because it needed it anyway, still no fix. Checked voltage at door jamb sw. 12v+/- present. Found what is either lighting control module or illumination control mod. under center dash on firewall, but cant find it in my Haynes repair manual, so my question (s) is , is this a possible cause or is there some advice as to direction to go from here? Thanks

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No stupid questions when it comes to asking for help. Yes, I checked bulbs, pigtails, I even jumpered direct to dome to make sure, and it came on. So I'm thinkin lost a ground between it all , but I'm more guessing than knowing.

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