Yogi

I have checked for bad bulbs, connections and grounds in the circuit for the rear driver side tail light, turn signal, and backup light. The passenger side lights work fine. Why and how can I fix the condition? There are no breaks in the connections and the wires leading to the fuse box are showing no corrosion and they are not loose. All fuses are good. Would the Body control module be my problem? The vehicle is a 2008 Chevrolet Suburban LT3 4WD.