Lost FM and DAB signal when heated rear window is switched on

[Colin Baillie]

Recently purchased a one year old Toyota CHR GR Sport. With the change in the weather I had occasion to use the heated rear window for the first time since purchased. When I switched it on the signal to the radio was lost on both FM and DAB stations. Fine on AM. 
Is this considered a fault (that should be covered by warranty) or just down to poor signal ?  My thinking is that the signal doesn’t deteriorate but disappears completely which doesn’t feel right.
Toyota want £109 for a diagnosis which will not be refunded if no fault is found.

Thoughts please.

[PCM]

Oh dear... that can't be right!?

If you recently bought it, I would expect the seller to fix it, free, unless it was privately bought? 

[FROSTYBALLS]

Well it isn't Toyota who are charging the diagnostic fee, but the dealer. The diagnostic fee is standard practice for most dealers, regardless of car marque. 

[Stivino]

It's not an unknown phenomenon, my Avensis has the aerial in the rear screen and it does it too.

A quick Google gave me this.

[flash22]

2 clip on ferrites as close to the radio on the dab and FM aerial cables

Search eBay for TDK clip on ferrite either 3-5mm or 4-7mm

that should stop the RFI from the heated screen

[forkingabout]

Hasn't got dash cams fitted by any chance?

 

[Derek.w]

Has the dealer warranty run out.

Check airial booster its inside tail gate look for corrosion of contacts you can also fit a tempory ground wire to see if it helps.

Check for Battery voltage supply to booster amp but you may have to fit a new module.

[flash22]

1 hour ago, Derek.w said:

Has the dealer warranty run out.

Check airial booster its inside tail gate look for corrosion of contacts you can also fit a tempory ground wire to see if it helps.

Check for battery voltage supply to booster amp but you may have to fit a new module.

CH-R has a shark's fin on the roof, the amp is built in to the base - high current circuit run near an RF coax (Poorly shielded) just picks up RFI/EMI and overwhelms the SDR