Door mirror controls.

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Can anyone advise me about the door mirror controls. The remote operation of my mirrors has stopped working ( some time ago). They did used to work, so I am suspecting the main controller unit has failed.

I'm not sure whats inside the divers door controlbox, so is it worth removing it - is there much in there to see / adjust / replace ??

Can it be fixed, or is it a part thats no longer available ??

Appreciate any suggestions / advice.

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Thanks for that - I am no electrician, so it may take me a while to absorb most of that information.

Looks like loads of good info.