C-Class (W204) 2008 - 2014: C180K, C200K, C230, C280, C300, C350, C200CDI, C220CDI, C320CDI

Radio stops working when rear defroster is turned on

Old Jan 17, 2014 | 01:10 PM
  #1  
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2013 C300 4MATIC Sport with P1, Bi-Xenon headlights, Navigation with backup camera, Sport Plus
Radio stops working when rear defroster is turned on

Guys,

I have a 6 month old CPO 2010 W204. I noticed today that when i turn the rear windshield defroster on my radio stops working...like static interference. Some station still worked but there was interference.

Is this just me or has anyone else noticed it? I installed a backup camera in my car a month or so ago but haven't notice any issues from it. Can that be causing the issue?

I guess one way to be sure is to disconnect power to the backup camera and see if it resolves it but I figured I ask here.

- Ken
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Old Jan 17, 2014 | 06:14 PM
  #2  
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2013 C300 4MATIC Sport with P1, Bi-Xenon headlights, Navigation with backup camera, Sport Plus
Tried disconnecting power to the backup camera to see if it makes a difference and it doesn't. Time to use the warranty.
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Old Jan 17, 2014 | 09:40 PM
  #3  
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2012 C300 4Matic
The radio antenna is part of the rear window - it looks just like the defroster 'wires' on the glass. Sounds like there's a short between the two, or the defroster is putting out too much power, or the antenna is somehow damaged. Sorry I can't be more specific. Sounds like it's going to have to be inspected / tested to find out.
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Old Jan 18, 2014 | 06:54 AM
  #4  
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2012 C250
Is the rear window tinted? If so did the installer use a nonmetallic tint? I believe that's why you're supposed to.
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Old Jan 18, 2014 | 07:35 AM
  #5  
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Possibly damaged by applying or trimming a tint or water from doing a tint.

Does your remote unlocking from a distance work reliably?

While very rare what you describe can mean a new rear window.
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Old Jan 18, 2014 | 07:36 AM
  #6  
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S213
acr2001 is right, you have a break in your rear window heater causing the radio interference.
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Old Jan 18, 2014 | 12:52 PM
  #7  
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2013 C300 4MATIC Sport with P1, Bi-Xenon headlights, Navigation with backup camera, Sport Plus
Dam that would be crazy. I don't have tints. Rear defroster works but generates interference. Good thing I am still in warranty and hopefully this is covered.
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Old Jan 18, 2014 | 04:25 PM
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2013 C300 sport 4matic
arc201's theory make sense. The backup camera which is recently install may be a coincident, but i don't think that is the actual cause. Take it to the dealer while it's under warranty and have it checked out.

Last edited by tonyteetime; Jan 18, 2014 at 04:33 PM.
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Old Jan 20, 2014 | 12:22 PM
  #9  
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Thanks have a appointment for this coming Friday. Hopefully i dont need a new windshield. Those things never go back the same as original.
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Old Jan 27, 2014 | 04:03 PM
  #10  
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2013 C300 4MATIC Sport with P1, Bi-Xenon headlights, Navigation with backup camera, Sport Plus
So MB is replacing the rear windshield to repair the issue. I told the manager that I was a bit concerned about it because I didnt want to end up with wind noise or any other issues because most of the time things never go back together like it came out of factory.

He assured me that they do it all the time and the work would be done on site by MB technicians who are very familiar with it.

Hoping it gets done right.....will update again.
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Old Jan 27, 2014 | 05:33 PM
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
They should have no problem glueing in a new rear screen.
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Old Jan 27, 2014 | 09:20 PM
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2013 C300 4MATIC Sport with P1, Bi-Xenon headlights, Navigation with backup camera, Sport Plus
Originally Posted by Glyn M Ruck
They should have no problem glueing in a new rear screen.
Cool. Never had a car which needed the rear windshield replaced. This will be the first.
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Old Jan 31, 2014 | 02:00 PM
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2013 C300 4MATIC Sport with P1, Bi-Xenon headlights, Navigation with backup camera, Sport Plus
Got my car back Thursday. Looks like they did an excellent job of replacing the windshield. I cant tell it was replaced. No wind noise or issues.

I had also complained about my front suspension making a noise over bumps, so they replaced the front struts and installed "upgraded dampers". NICE!
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