Hey everyone, I've got a Bighorn and I recently noticed that when I drive at night, my driver's side and rear view mirror dim correctly and on the driver's side mirror, I can clearly see the outline of the area where the dimmer is working. I noticed on my passenger side however, that it doesn't dim at night and I can't even see the outline of the area where the mirror would be dimmed. I'm taking it in for service next week to have this checked out but I was wondering if based on your trucks all three mirrors have the dimming effect or not?