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Adding a Sub Woofer to Mk3 Focus.

Nathan Buffery
Nathan Buffery
in Ford Focus Club

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So I picked up a focus subwoofer for £20 a week ago and had a failed attempt at fitting it today. 

After studying the wiring diagram I managed to find a plug under the drivers side rear seat with the right wire colours in. Connected it up and changed the setting with Forscan, but it didnt work. So I took the ACM out and saw that there were no wires connected to the terminals on the back. I connected them direct, but still no luck. 

I have retro fitted a sync 2 into my car with a DAB so I thought I had the right ACM with the facilities for the woofer.

Any ideas? Or has anyone successfully added the woofer? 

  • Quote
    • 4 weeks later...


    • Author

    So looking into this a little further, it looks like there is a specific ACM for the sub woofer option with a separate connection F1BT- 18C185- Z**.

    20231024_201626.thumb.jpg.c30519ea4f157f0b43bb3e20fc974a48.jpg

    I was wondering if these are the only ACM's for the Sub option or is there an ACM that starts with BM5T that will work? 

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    • The Digestive Forum Roundup (24th May - 31st May 2026)

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