mirror illumination? check your mirror housings, see if there is moisture there...

how about the interior lights? do they work?

what about front fog lights? do they come on?

the lights in general do not have fused connections - all connections are reporting directly to LCM, and the lights are protected by transistors inside the LCM.

since a certain set of lights is not working, you have several possibilities:

something is shorted somewhere, not necesseraly light related, but as a result, the electricity finds a different path which cuts off the power to certain lights - a b!tch to find

you have a set of pins on the LCM connector that are displaced/corroded and those pins are all related to the lights that are affected - relatively easy to rule out, just get to the LCM pop the connectors, see if anything is out of ordinary

and something died inside the LCM - a b!tch by itself, as you will need to replace the LCM (might consider getting the latest applicable version) and have it programmed into the car with the mileage, otherwise the mileage tamper light will come on.

when you lock/unlock the car, do you get the visual from the turn signal lights? do they blink? do you get an audio chirp?