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Open bonnet warning / open door alarm gone

Discussion in 'Electronics' started by 2003clk240, Oct 18, 2016.

  1. 2003clk240

    2003clk240 New Member

    Messages:
    25
    Joined:
    Aug 1, 2016
    Car:
    Clk240
    A few seconds after starting my car the main circular display in my dashboard went red saying the bonnet was open. I got out pressed down on the bonnet and checked it was closed. Got back in, warning was off, proceeded journey. A few seconds later the car starts beeping for a few seconds. No other problems.

    The day after I checked the front bonnet sensor and cleaned out a little black dirt on it. No warning lights on now, even when they should be on because bonnet/doors/trunk are open and engine is running. Alarm for any open doors seems to be gone.

    I checked the fusebox instructions but there is no mention of any fuses for these systems.

    Any ideas? Any help appreciated. Thanks
     
  2. Dec

    Dec Hardcore MB Enthusiast

    Messages:
    3,990
    Joined:
    Jul 28, 2004
    Car:
    C180,A. September '97 48k
    Faulty car alarm?

    Dec
     
  3. andy27168

    andy27168 Hardcore MB Enthusiast

    Messages:
    4,190
    Joined:
    Nov 27, 2004
    Location:
    Southampton
    Car:
    1997 C230K, 1999 C43/55 AMG
    Hi,
    On my CLS the dash only goes red when the car is moving with the door/boot/bonnet open, I think that is the way it is supposed to work.
    Have you tried driving slowly forward with door/bonnet/boot open and seeing what if anything it is doing now?
     
  4. PobodY

    PobodY Hardcore MB Enthusiast

    Messages:
    1,525
    Joined:
    Aug 23, 2016
    Location:
    Stoke-on-Trent
    Car:
    CLK350 Sport, Nissan GTiR
    I can't say I've ever noticed a warning message about the doors or boot being open, but as above they're generally not open when the car is moving (so with engine running, let wife out and press boot release button).
     
  5. OP
    OP
    2003clk240

    2003clk240 New Member

    Messages:
    25
    Joined:
    Aug 1, 2016
    Car:
    Clk240
    Hi, thanks for your contribution. I tried opening the door when driving at about 40km/h and the open door warning did show up. I also opened the bonnet whilst driving into the garage and the warning also showed up. So everything seems to be working now. Maybe the original open bonnet warning just happened because the metal sensor was a little dirty (or maybe because it had been raining a little - I have a feeling that humidity sometimes has strange consequences to the car's electrical system). Based on what you say and what I tried today, maybe these warnings only happen if you are driving at a minimum speed (no idea which).
     

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