Interior Lights don't come on when side

Electrical problem 6 cyl Front Wheel Drive Automatic 71400 miles

When either the passenger or driver's sliding side doors are opened, no middle seat or rear interior lights come on. Very occasionally, the lights flicker and I can hear a noise similar to a contact trying to connect. Where would I look for this contact or switch that controls the interior lights? For reference, all lights turn on when I use the inside 'all lights' switch, and the light illuminate when individually pressed with the doors closed, so I know they all work


Thanks