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Auto dimming rear view mirror help needed

Miles5600
Miles5600
in Ford Fiesta Club

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I bought a new rear view mirror for my fiesta mk8 and it’s an auto dimming one, my car doesn’t have the loom to plug this mirror in so I tapped into my interior light for the 12 volt.

the problem I have is that I can’t get the mirror to work, it’s not doing anything, I’m assuming red is live and grown is ground right?

here are a couple pictures of the mirror.

 

IMG_0844.png

IMG_0846.png

IMG_0847.png

  • Quote


    There should be 3 wires. The mirror is controlled from the BCM, it's not just a case of connecting a positive and negative supply.

    These are the connections for a 2021 Mk8 Fiesta.

    inside mirror.JPG

  • Quote
    • Author
    1 hour ago, unofix said:

    There should be 3 wires. The mirror is controlled from the BCM, it's not just a case of connecting a positive and negative supply.

    These are the connections for a 2021 Mk8 Fiesta.

    inside mirror.JPG

    Why can’t I just use the ground and 12 volts though? I saw another thread where someone only had to connect the ground and live, the third one was for temporary turning the mirror off when reversing.

  • Quote

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