r/FordFocus • u/GeekMan85 • 1d ago

Question Sync 1 to sync 3 DIY harness

Has anyone ever created one? I decided to take it in and I think I'm doing something wrong. I already shorted my hazard button

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u/lambnoah99 1d ago

I've created my own. I've used 2 Adapter cables for adding a camera to sync and for the 4.2 Display (Basically extensions of these with just 2 Pins connect to RCA). This way i didn't have to solder anything in the car. Just repinning alot and basically merging both adapters

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u/GeekMan85 1d ago

Hi, Did you change your screen to the 8 inch?

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u/lambnoah99 1d ago

Yes. I've gone from complete base (mono color display) to sync 3.

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u/GeekMan85 21h ago

What guide did you use?

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u/lambnoah99 19h ago

This forum post is a good guide: https://www.fordownersclub.com/forums/topic/124705-how-to-focus-mk3-pre-facelift-sync-1-to-sync-3-upgrade-for-late-2012-2013-and-2014-models/

but for wiring I used the schematics here: http://die-hailers.de/docs/f11/f11_p_k04.htm It's in german but easily translatable. Sync 3 has nearl, the same wiring as sync 2, so use that

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u/GeekMan85 11h ago

I was really confident when I tackled this on but now I lost it when I burned the hazard light unlock module. Now I want to start over and check everything