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Just did a full build out on my 21. All door speakers are the same as the 2020. I have a wiring diagram if anyone needs it. Actually very simple job and my system is WAY better. Had to do an under seat sub though just couldn't squeeze it behind the seat (well not a good sub). Fair warning I was...

Was anyone able to find a wiring diagram for the Sync 4?

SO did you replace your rear speakers too? same mounting kit and accessories?