2001 Honda Accord Tail light and back light (not a break li

My car tail light and back light are off. The display panel shows a red rectangular shape (symbol) and a dim "break light". All the break light are OK ( I replaced them and they work ok now). However the Tail l;ight and back light ( next to the break light areas) are still bad ( no lit up) even I replace them all.
How can I diagnose this off light problems .. What probably cause them.

Thanks.