Originally Posted by willwren
Bingo. The blue tint is a dead giveaway on the Bonnevilles. I've never seen blue tint without the heat option.
I agree. As for SSEs and SSEis with heated rear windows and non-heated mirrors, I don't know what to say. All I can tell you is that the service manual lists no separate RPO code for heated mirrors alone, and the wiring diagrams do not show them as optional parts of the defogger circuits, so...?
Maybe they were separate options in years other than 1993; otherwise I have no idea.