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whats that buttom like thingy?

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by deano1978, Jul 8, 2013.

  1. deano1978
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    deano1978 different gear

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    [Jul 8, 2013]
    upfront on the front dash speaker,there's like a little button. anyone know more?
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  3. Cabbyfan
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    Cabbyfan Member

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    [Jul 8, 2013]
    If its what I think you are referring to it is a sensor that detects sunlight in the car and helps the heating / air con work.
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  4. deano1978
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    deano1978 different gear

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    [Jul 8, 2013]
    really. well i never knew that.
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  5. Az
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    Az Hard slammed!

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    [Jul 9, 2013]
    I always thought the climate control worked off of the outside temp sensor? and the sensor on top of the dash was for the dashboard display to dim when it's low light outside?
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  6. Greeny233
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    Greeny233 Active Member

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    [Jul 9, 2013]
    I always thought it was something to do with the alarm. Either a infrared movement sensor or a sensor for the key remote.
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  7. AlexGSi2000
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    AlexGSi2000 Well-Known Member VCDS Map User

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    [Jul 9, 2013]
    Yeah, think its the RF antenna for the alarm.

    The instrument dimming sensor is within the speedo dial.
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  8. SmoothAssault
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    SmoothAssault Will design for mods

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    I just took my whole dash out, the Haynes described it as a light sensor.
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  9. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    [Jul 9, 2013]
    Just to check? Blimey, that's dedication! lol
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  10. SmoothAssault
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    SmoothAssault Will design for mods

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    Haha, yes, of course! ;)
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  11. GeoffDunk
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    GeoffDunk Active Member

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    [Jul 9, 2013]
    Is it the item circled in the picture?

    If so its the sunlight sensor, along with the outside temperature and the sun sensor the system calculates the correct temperature to issue from the climate system.

    Its to combat the greenhouse effect caused by the glass.

    All modern vehicles have them and they are only for cars with climate, not simple air conditioning, I seem to remember its something Saab implemented first.

    sun-sensor.jpg
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