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Thread: Rear fog light operation

  1. #1
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    Question Rear fog light operation

    Just fitted a new (second hand) Light Switch unit to my 04 Vectra Design and been 'testing' it to make sure it's operating properly.

    With the light switch on Dipped Beam, both the Front & Rear Fog lights work (ie switch on/off) completely independently. However, with the light switch on Parking Lights, the Rear Fog light will only come on if the Front Fog light is already on. With the Front Fog on, the Rear Fog can be switched on/off independently. But if both Fogs are on then switching off the Front Fog also switches off the Rear Fog. Hope that's clear - the main point is that the operation of the Fogs is interconnected when the light switch is set to Parking Lights.

    Now, in a way this all sounds reasonable - eg why would you want only the Rear Fog on if on Parking Lights ?

    But my question is : is my new (second-hand) Light Switch unit working correctly ? Any views ? Thanks.

  2. #2
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    Vehicle : Vauxhall Astra-J

    Trim : Elite

    Engine : 2.0 CDTi

    Year : 2013

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    Yes, that's exactly how it should work.

    Rear fogs can only be switched on (if you've got front fogs) if:-

    Dip or main beam headlights are on,

    or,

    sidelights and front foglights are turned on.


    If however you didn't have front fogs then I believe the rear fogs will work with sidelights on.

  3. #3
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    Thumbs up Fog lights

    Great - thanks for the confirmation.

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