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Rear demister kills radio signal

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Old 26 October 2017, 07:51 PM   #1
Jon T
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Default Rear demister kills radio signal

Hi all ever since i had the car if i turn on the rear demister when listening to the radio all signal is lost and all i get is static. Turn the demister off and all good again. Got a new head unit coming tomorrow to replace oem one. Was just wondering if anyone knew what was causing it so i can fix it while putting the new head unit in.
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Old 26 October 2017, 08:07 PM   #2
Don Clark
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The rear demister acts as the aerial as well via a powered amp along with a noise suppresion unit
Sounds as if the noise suppression unit may be dead.
Details all here..........
http://opposedforces.com/parts/impre...llustration_2/

When fitting a new HU make sure you connect to the powered amp (usually the blue powered aerial wire)

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Old 26 October 2017, 08:40 PM   #3
Jon T
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Is the noise suppressor in the boot ?
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Old 27 October 2017, 10:07 AM   #4
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Looking at the diagram in opposedforces I would think its on the RH side tucked up under the rear parcel shelf.

from the MY07 workshop manual




Noise suppressor is choke coil on wiring diagram below


Last edited by Don Clark; 27 October 2017 at 10:12 AM.
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Old 27 October 2017, 11:03 AM   #5
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Thanks will have a look over the weekend
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Old 13 November 2017, 04:23 PM   #6
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Don't know if you ever fixed this but I had the same problem on a bmw years ago. I tinted the rear window and when I ripped the tint off it must have damaged the demister/aerial matrix on the glass because it did exactly as you say... static.
I presumed the voltage was leaking from the defogger track across into the aerial track on the glass.
I '''fixed''' it by fitting a new aerial.
Maybe its the same thing here?
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