I'm not exactly sure when it started. It's been a long time. First, the light under the headlight doesn't work. Second, the automatic headlight doesn't work normally. Sometimes it works and sometimes it doesn't. This just happens on the passenger side of the Suburban. I can give it a light tap and it will go on. It's very annoying! My husband got pulled over for having a headlight out the other day. He just got a warning beacause he tapped it and it came on. We have taken it to the dealership and they couldn't get it to do it. I don't know if it's a wiring problem or what, but the dealership couldn't figure it out. I see a lot of Suburbans driving down the road that have one headlight out too. I think my husband has even replaced the light once. I don't know if other people have this problem but it sure is aggravating!