 When my husband and I bought this vehicle we were very excited. We thought we made the right decision on purchasing this 2015 Toyota Highlander. Now I'm afraid we made a big mistake. We started to notice this buzzing sound in the cabin. I thought I was the only one to noticed, until my 19 year old daughter sitting in the back seat asked me " mom what is that buzzing sound". Well now we all hear it, especially on long trips. I wrote an email to Toyota about this issue, haven't anything back yet.We are thinking about trading our Highlander for something else.