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Rear heated screen not working


cocog
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Working through few repairs on my Audi A4 and one outstanding problem I have is the rear heated screen is not working.

The heated mirrors work when heated screen button pressed on centre console.

I have checked the 40A fuse and relay and they are okay. The screen isn't oxidised or any signs of delamination.

I have also checked battery voltage which is 12.3V when static.

Any ideas on what it may be before I start to strip trim out to chase things?

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The points most susceptible to damage are the terminals where the supply connects to the heating element. Have a good look at them first. If possible, test for power at those terminals with a volt meter.

It would also be worth inspecting the wires that pass through a rubber bellows between body and boot lid. They have been known to break with the repeated flexing as the lid is opened.

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