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Rear Fog lamp Mod

This is a discussion on Rear Fog lamp Mod within the Focus RS Discussions forums, part of the Focus RS Forums category; [QUOTE=apextheorem;1759266] I don't really consider the factory rear valence a "diffuser" even though it looks like one since it does not nearly have enough surface ...

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Thread: Rear Fog lamp Mod

  1. #31
    RS Rookie GOTMK3_RS's Avatar
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    [QUOTE=apextheorem;1759266]

    I don't really consider the factory rear valence a "diffuser" even though it looks like one since it does not nearly have enough surface area underneath the car to be a functional diffuser. On the other hand, an proper aftermarket diffuser, such as the BMSPEC diffuser I am currently running, would cover the underside of the car and ideally extend to the rear subframe and thereby actually reduce drag:

    Attachment 241818


    This diffuser looks sick! How much does this diffuser cost? And how much of a difference do you feel at the higher speeds?
    I think my back got scoliosis cuz I swerved the lane skkkkkkrt
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  2. #32
    RS Specialist phillofoc's Avatar
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    Back to the original topic, has anyone figured out how to wire this up to a stock (US or Euro) switch? I want to throw rear fogs in my light housings as there is an open spot for the USDM ones. I bought a UK light switch with the rear fog switch to throw in when I figure it all out, I want to the keep the car looking as OEM as possible. We at least have the indicator on the dash, so I imagine if it's figured out the BCM and the dash will acknowledge it and power them.

    I have a 2011 wiring diagram and it has an alternate use (secondary tail light IIRC) on the US market models. I imagine it's a FORScan option, or maybe I'll get lucky and the wiring to the controller is different (like the euro radio fascia for the DISP button).

    I haven't taken anything apart yet to look. But it seems that I'll have to take the interior apart and trace the wiring back to various connectors to figure this out. Not the first time I've done this type of thing on cars before, but it's one of my least favorite things to do on a car.
    If you buy one, drive it hard. Because thrills like these don’t happen often.

  3. #33
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    Quote Originally Posted by phillofoc View Post
    Back to the original topic, has anyone figured out how to wire this up to a stock (US or Euro) switch? I want to throw rear fogs in my light housings as there is an open spot for the USDM ones. I bought a UK light switch with the rear fog switch to throw in when I figure it all out, I want to the keep the car looking as OEM as possible. We at least have the indicator on the dash, so I imagine if it's figured out the BCM and the dash will acknowledge it and power them.

    I have a 2011 wiring diagram and it has an alternate use (secondary tail light IIRC) on the US market models. I imagine it's a FORScan option, or maybe I'll get lucky and the wiring to the controller is different (like the euro radio fascia for the DISP button).

    I haven't taken anything apart yet to look. But it seems that I'll have to take the interior apart and trace the wiring back to various connectors to figure this out. Not the first time I've done this type of thing on cars before, but it's one of my least favorite things to do on a car.
    Check out the other rear-fog light thread for all the info needed to wire the foglight and setup support in the BdyCM with forscan.

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  5. #34
    Supporting Member nicklulu's Avatar
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    @Barroux had done great leaps and bounds on this
    2018 NB Focus RS LE
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  6. #35
    RS Specialist phillofoc's Avatar
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    Quote Originally Posted by jefferysanders View Post
    Check out the other rear-fog light thread for all the info needed to wire the foglight and setup support in the BdyCM with forscan.
    Yup, I'm playing along there too. Thanks!
    If you buy one, drive it hard. Because thrills like these don’t happen often.

  7. #36
    RS Member White-RS2's Avatar
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    Rear fog light brake light strobe / flasher unit

    https://www.ebay.co.uk/itm/New-Relea...UAAOSwZltb4iAb

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