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Thread: What's This......

  1. #1
    Regular Member Ben H's Avatar
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    Default What's This......

    Have only had the car now for 18 months but today I was stood infront of it chatting to someone and at a glance I noticed something which was white recessed and off to the nearside in the back casing of the auto dipping mirror.
    Have never noticed it before and tbh I forgot to have a closer look later on so I'm just being lazy & wondered if anyone on here knew what it was

  2. #2
    Regular Member 3.2_V6_VXR's Avatar
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    Ive wondered what that is too lol

  3. #3
    Regular Member danlat1415's Avatar
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    Quote Originally Posted by Ben H View Post
    Have only had the car now for 18 months but today I was stood infront of it chatting to someone and at a glance I noticed something which was white recessed and off to the nearside in the back casing of the auto dipping mirror.
    Have never noticed it before and tbh I forgot to have a closer look later on so I'm just being lazy & wondered if anyone on here knew what it was
    It's the sensor for the auto dimmer. It senses the brightness, and turns the mirror blue when dark.
    Try covering it for a couple of seconds with your finger next time you're in the car.

  4. #4
    Regular Member graham a's Avatar
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    was it for automatic garage door openning,i seem to remember in my last vec c reading the manual about this

  5. #5
    [Ex]Admin Duncan's Avatar
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    Quote Originally Posted by danlat1415 View Post
    It's the sensor for the auto dimmer. It senses the brightness, and turns the mirror blue when dark.
    Try covering it for a couple of seconds with your finger next time you're in the car.
    Yep, as Dan said. It senses the outside brightness (or darkness! lol) and won't dim the mirror unless the front sensor detects it's dark outside and the sensor on the glass side detects brightness.

  6. #6
    Regular Member Ben H's Avatar
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    I knew the sensor on the front was to dip the mirror if headlights from behind dazzle you, just presumed it worked when the lights were on but then that sounds about right for the Vectra

    "lets have yet another pointless sensor instead of using the light circuit to activate it"

    I bet the boffs said when they designed it.

  7. #7
    Full Member Big Sig's Avatar
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    Its because some peeps drive round with their lights on all the time. It also gives better rear vision at night when no one is behind you at night as it changes state, as Duncan said, when the light difference front to rear is over a set limit.
    Now I need a turbo to keep up!

  8. #8
    [Ex]Admin Duncan's Avatar
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    Quote Originally Posted by Ben H View Post
    "lets have yet another pointless sensor instead of using the light circuit to activate it"
    Quote Originally Posted by Astrase20 View Post
    Its because some peeps drive round with their lights on all the time.
    Yep, that'd be why they didn't do it - I'm one of those said drivers. As has been said, it's activated depending on the difference between the front and rear brightness.

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