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Thread: rain/headlight sensor

  1. #1
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    Default rain/headlight sensor

    When it is raining and I have the wipers on in either intermittent or continuous mode the headlights now don't come on. It would seem to be a faulty sensor. Is this the case and is it easily replaced, any idea how much a new sensor is? Any advice would be appreciated, Thanks.

  2. #2
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    Vehicle : Vauxhall Astra-J

    Trim : Elite

    Engine : 2.0 CDTi

    Year : 2013

    Default

    The headlights don't come on with the wipers, or am I not understanding your question correctly?

  3. #3
    Regular Member lofty's Avatar
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    Vehicle : Vectra C Estate

    Trim : Elite

    Engine : 1.9 CDTi


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    Depends on how fast them wipers are working. Sometimes mine (lights that is) don't come on unless it's really chucking it down and quite overcast.

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    I've an 06 Design spec and the wipers have always actuated the headlights after a period of time, usually only a few minutes. I was on the A1 yesterday and it was raining heavily and the headlights simply didn't come on and I had to switch them on manually. I gave them a good ten minutes and previously they have come on after a lot less time than that hence my assumption that the sensor is faulty. They come on with no problem if it is overcast or if you go into a multi storey car park so the light sensor seems to be OK.

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    Vehicle : Vectra

    Trim : SRI

    Engine : 3.0 V6 CDTI

    Year : 2007

    Default

    The way to test it is to start the engine, put the lights into Auto and then cover the sensor at the top middle of the windscreen, to test the wipers put them into the auto mode (one position up) and poor some water down the screen.
    If the wipers are working from the speed adjuster then chances are your sensor has gone.

  6. #6
    Regular Member lutonmatt's Avatar
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    i had this monday the lights would not come on when it was raining
    but then was not very dark

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    Vehicle : Vauxhall Astra-J

    Trim : Elite

    Engine : 2.0 CDTi

    Year : 2013

    Default

    I thought it was two separate sensors.

    One for the lights, one for the wipers.

    Hence my earlier comment of the lights shouldn't come on when you switch the wipers on, unless it's dark enough or overcast enough for the light sensor to switch them on.

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