[Qsilver7]

I would assume that the issue you’re having has something to do with the switch contact that is discussed in the paragraph about PREREQUISITES near the top of the TIS info about functional description.

Read/reread the description of how the light comes on when the contact switch in the visor is within the conditional range…and then the cover of the mirror is opened. See if you adjust the position of the visor while the mirror cover is open to see if the light comes on. It sounds like the contact switch in either the visor or the mirror cover is wonky.

Good luck. If the contact is bad in the visor…you may need a new visor. It may have been damaged by the previous owner who may have been rough on the visor. I remember a thread a decade or so ago…where a forum member had a friend in the front passenger seat that handled the visor so roughly they broke it off the hinge. Personally, if that was someone I knew…they would never be allowed in the front seat…or perhaps my car if they did something like that.