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[grifter]

As per title, the radio signal goes fuzzy when rear screen on. Take it some sort of earth problem perhaps. Am i right in saying the rear element is the aeriel?

[Lincs Robert]

It is indeed. I had this problem on a number of Omega saloons, never did cure it - although it never occurred in a strong signal area.

I just got used to switching the radio off until after the rear screen had done its stuff.

[Andy B]

My Merc does the same ..... not always though   

And my Omega also had the same problem  ..... I checked connections etc but didn't cure it

[Doctor Gollum]

Moisture in the amplifier module... Once symptoms start, only cure is new replacement.

Another unintended consequence of not using aircon

[Andy B]

Moisture in the amplifier module... Once symptoms start, only cure is new replacement.

Another unintended consequence of not using aircon

My air/con is always on  ..... always has been

[Doctor Gollum]

Being an estate, the amplifier is probably buried in a soggy spot in a rear quarter 

[VXL V6]

First step is to clean the inside of the window.

[Lincs Robert]

Moisture in the amplifier module... Once symptoms start, only cure is new replacement.

Another unintended consequence of not using aircon

And poor design! There is actually a general issue with ageing electronics being susceptible to moisture- apparently some of the black resin used to encapsulate chips etc can become porous with age!

[Marks DTM Calib]

From personal experience I cant say I have noticed the electronics being a common cause, the few I have seen were either a loose ground connection or an element fault.

With the heated rear screen on, are all bar showing signs of heating/clearing and all to a similar level?

[grifter]

From personal experience I cant say I have noticed the electronics being a common cause, the few I have seen were either a loose ground connection or an element fault.

With the heated rear screen on, are all bar showing signs of heating/clearing and all to a similar level?

I think so but will double check

[grifter]

Being an estate, the amplifier is probably buried in a soggy spot in a rear quarter 

It's a saloon

[Doctor Gollum]

Being an estate, the amplifier is probably buried in a soggy spot in a rear quarter 

It's a saloon

The R Class isn't 

[Kevin Wood]

From personal experience I cant say I have noticed the electronics being a common cause, the few I have seen were either a loose ground connection or an element fault.

With the heated rear screen on, are all bar showing signs of heating/clearing and all to a similar level?

Yep - most likely arcing at a small fracture in the screen element or a poor connection where the window attaches to the vehicle loom.