Sure...luxury car...luxury service...luxury price.
I mean...they're in business to make money. How were they dishonest? You have to understand that they can't just "check to see if a fuse is out" , they have to take it back into the shop, pull a tech off of something else to have him look at it, etc. There's a schedule, they have vehicles back there that are being worked on that need to be delivered when they were promised, they have to schedule you into that schedule, and when they use time in that schedule...they need to be paid. The service writers a lot of times don't know anything about cars. I've found maybe 1 in 5 service writers would even know where to find the fuses.
The question would be if they looked and saw that the switch was just off, would they still charge you a diagnostic fee? My guess is no. My dealer wouldn't. Even if they did though, thats not dishonest. You told them the system wasn't working, they diagnosed a problem...they're owed a diagnostic fee. If I owned the dealer I wouldn't charge for something like that, because its an opportunity to build trust and that trust is worth more than $80 to me. But...not everybody sees it that way.
I don't mean to sound like I'm raining on your parade, but I've found you wind up much more satisfied with things in your life when your expectations are set properly. I think people are overly harsh on the dealers and what they cost. In order to have the fancy TVs, marble floors, leather chairs, free cafe, movie lounge, mini golf course, indoor driving range (my dealer has all this stuff), a fleet of $40-60k loaner cars (my dealer has ES, GS, IS, HS, RX, GX & LS loaners, including a few IS-Cs)...someone has to pay for that, and the price of the service is going to be higher.
My independent mechanic charges like half what the dealer does, but its one bay with his little office next to the train tracks and the NTB, and I get a ride to the subway...in my own car. Dealer has a $140 labor rate...he is $85. So...its a different thing.