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Opel Astra: Dim Dashboard Lighting When Car Lights Are Turned On - Possible Reasons?

Elpollaczek 12162 9
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Why does the dashboard lighting in an Opel Astra get dimmer when the car lights are turned on?

The dashboard dims when the lights are turned on because the instrument backlight is normally reduced by the dimmer under the light switch, so the clocks are weaker in night mode [#16445838][#16446143] If the dimming seems excessive or started recently, the dimmer itself may be damaged [#16446143] A useful check is to compare it with another Astra to see whether it behaves the same [#16446143] In the thread, the original poster later confirmed that the problem was with the dimmer [#16447418]
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  • #1 16445826
    Elpollaczek
    Level 4  
    Posts: 80
    Rate: 5
    Hello, my aunt has a problem. Recently, she noticed that when she starts the car, turns on the lights, the dashboard shines dimmer. What could be the reason for this?
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  • #2 16445838
    decybel91
    Level 43  
    Posts: 8003
    Help: 1022
    Rate: 4220
    Adjusting the dimmer under the light switch.
  • #3 16445839
    Elpollaczek
    Level 4  
    Posts: 80
    Rate: 5
    The dimmer has not been moved, and this has been happening for some time: / When the lights are turned off, the board shines normally, and when the lights are turned on, it goes off slightly.
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  • #4 16445902
    jacekwwy
    Level 19  
    Posts: 395
    Help: 39
    Rate: 108
    You will not do anything about it, unless you remake the installation yourself, it is a night mode, the car thinks that when you turn on the lights, it is night and dims the board so that it does not dazzle (distract the driver), only the car does not know that in Poland you also drive traffic lights during the day. :) I suggest you install daytime running lights rather than intervene in the electrical system somehow and the problem will automatically disappear. :)
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  • #5 16446002
    Elpollaczek
    Level 4  
    Posts: 80
    Rate: 5
    It's just that a week ago the car didn't think like that and didn't have any night mode turned on: v
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  • #6 16446128
    jacekwwy
    Level 19  
    Posts: 395
    Help: 39
    Rate: 108
    Elpollaczek wrote:
    It's just that a week ago the car didn't think like that and didn't have any night mode turned on: v

    If you want someone to help you, write a little more about the car because I only know that it's Opel because newer cars can have such functions. Or maybe someone accidentally turned it on with a key or via VAG?
  • #7 16446143
    grala1
    VAG group specialist  
    Posts: 9817
    Help: 1495
    Rate: 5050
    This is normal symptom. She probably didn't notice it before or she has a damaged dimmer, but the backlight will always be weaker on the lights.
    Disconnect the wire from the meter that informs him that the lights are on - then there will be no difference in the backlight of the meter whether the lights are on or not.

    To be sure that your aunt is not dark, see how it is in another Astra.
  • #8 16446185
    Hajna
    Level 24  
    Posts: 478
    Help: 69
    Rate: 145
    grala1 wrote:
    This is normal symptom
    I have an astra from 2000 and it is like the author writes with meters

    Added after 10 [minutes]:

    It dims when the lights are turned on, regardless of the time of day
  • #9 16446424
    tensor125
    Level 8  
    Posts: 42
    Rate: 4
    I also have Astra and they are slightly darker for me. Check the battery voltage, maybe the voltage regulator in the alternator goes down. It shouldn't dim the clocks very much.


    Moderated By T5:


    As a colleague will explain the regulator-board dimming relationship, I cancel the warning.
    3.1.11. Don't post messages that add nothing to the discussion. They are misleading, dangerous or do not solve the user's problem.

  • #10 16447418
    Elpollaczek
    Level 4  
    Posts: 80
    Rate: 5
    The problem was with the dimmer, thanks so much for your help. Topic is closed
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Topic summary

✨ The discussion revolves around a problem with the dashboard lighting of an Opel Astra, which dims when the car lights are turned on. Initial suggestions included adjusting the dimmer switch, but it was noted that the dimmer had not been moved. Some users explained that this dimming is a normal feature in newer models, designed to reduce glare at night. Others speculated that the issue could be related to a malfunctioning dimmer or electrical system. A user with a 2000 Astra confirmed similar behavior, while another suggested checking the battery voltage as a potential cause. Ultimately, the problem was identified as a faulty dimmer.
Summary generated by AI based on the discussion content.
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