When do the rear lights behind the inside red lense ( nearest the liscense plate ) come on?

Reason I ask is my dash light monitor is on but all my lights are working, including the lisc plate lights,brake lights, turn signals side and rear running lights, but when I did the test the thought came to me that I've never seen these lights on! weird. Are they brake lights, running lights, 4 ways?

Thanks in advance for any tips/ advice.

Todd

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1990 420 SEL / 151K mi.