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Old 01-11-2013, 06:08 AM   #1 (permalink)
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DIC automatic control

I have an Opel GT 2007. In most of Europe it is now prohibited to drive with the headlights on. All cars sold new in Norway, where I live, are therefore set up with headlights ON as default. You can actually not turn the light completely OFF while the engine is running.

Some months ago a problem with the automatic sensor, diming the DIC and the stereo occurred. First it started when driving through tunnels – DIC and stereo dimmed down as normal when I entered tunnels, but after exiting the tunnel it took 20 seconds or so before it turned back to normal mode. Now it has gradually become worse – lights in DIC and stereo don’t turn to normal at all, not even in bright daylight. Today, I tested the sensor by putting my iPhone in flashlight mode and lay it upon the sensor. Then it worked like it should, but it dimmed down immediately after I removed the iPhone.

This problem is really a pain in my ***, because I also have the “overheating problem”. So while driving in daylight I really need to keep an eye on the temperature.

Any suggestions?
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Old 01-11-2013, 06:32 PM   #2 (permalink)
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left of your steering wheel there is a brightness control knob.
on the over heating air in the system .
use the search tons of info .
Norway beautiful country .
welcome to the fourm .
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Old 01-11-2013, 06:44 PM   #3 (permalink)
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by chance..the sensor could be dirty.
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Old 01-11-2013, 09:13 PM   #4 (permalink)
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Originally Posted by lllfly View Post
left of your steering wheel there is a brightness control knob.
on the over heating air in the system .
use the search tons of info .
Norway beautiful country .
welcome to the fourm .
LLLFLY
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Old 01-11-2013, 10:08 PM   #5 (permalink)
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No this is not a poem .lol
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Old 01-12-2013, 09:49 AM   #6 (permalink)
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Originally Posted by peter View Post
Some months ago a problem with the automatic sensor, diming the DIC and the stereo occurred. First it started when driving through tunnels – DIC and stereo dimmed down as normal when I entered tunnels, but after exiting the tunnel it took 20 seconds or so before it turned back to normal mode. Now it has gradually become worse – lights in DIC and stereo don’t turn to normal at all, not even in bright daylight.

This problem is really a pain in my ***, because I also have the “overheating problem”. So while driving in daylight I really need to keep an eye on the temperature.

Any suggestions?
Certainly sounds like your light sensor is flaking out. Obviously you can replace it. Or you can bypass it with a low-ohm resistor to make it think it's bright and sunny all the time - but then you'd have to switch the 'brighter' (non-DRL) headlights on manually at night.

As for your overheating problems this could be one of two things depending on the symptoms. If it overheats at any time (even driving along the highway) then it's probably air in the system (or possibly a failed thermostat). If it only happens when stopped in traffic or driving slowly, then check that your radiator fan is operational.
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Old 09-17-2013, 08:13 PM   #7 (permalink)
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light sensor

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Originally Posted by TomatoSoup View Post
Certainly sounds like your light sensor is flaking out. Obviously you can replace it. Or you can bypass it with a low-ohm resistor to make it think it's bright and sunny all the time - but then you'd have to switch the 'brighter' (non-DRL) headlights on manually at night.

As for your overheating problems this could be one of two things depending on the symptoms. If it overheats at any time (even driving along the highway) then it's probably air in the system (or possibly a failed thermostat). If it only happens when stopped in traffic or driving slowly, then check that your radiator fan is operational.
Where in the light sensor circuit would the resistor be placed?
What ohm resistor should be used?
Thanks, Jerry
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Old 09-18-2013, 07:07 AM   #8 (permalink)
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Does anyone know the sensitivity of the sensor as a function of light intensity and angle? I've noticed the sensor seems to be less sensitive (proportionally) when the sun/light is at an angle. It appears to be plenty of "light" to the human eye, but not for the sensor, due to the angle.

The DIC response will have a bigger degradation period as you go further North in the Winter. The OP lives in Norway and mentioned the problem "gradually got worse". Note the Sun's declination gradually got lower heading into Winter.

Solstice owners should be well acquainted with the extremes of this phenomenon.
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