A3 saloon 2015 1.6 Tdci ultra s line.  Rear demister doesn’t work, and the radio reception is terrible.  Checked fuse f7 and f53, and they are good.  Rear demister button lights when pressed, but stays on constant. Can anyone help 🙏 

21 hours ago, JimJnr72 said:

A3 saloon 2015 1.6 Tdci ultra s line.  Rear demister doesn’t work, and the radio reception is terrible.  Checked fuse f7 and f53, and they are good.  Rear demister button lights when pressed, but stays on constant. Can anyone help 🙏 

I'd recommend a diagnostic check to see if any fault codes flag up. It could be a broken wire on the demister. The radio could be a failing antenna 

On 10/22/2022 at 3:37 PM, Steve Q said:

I'd recommend a diagnostic check to see if any fault codes flag up. It could be a broken wire on the demister. The radio could be a failing antenna 

Thanks Steve.  I’ve got an ancel vd500 VAG code reader.  Should it come up in there somewhere?

I'd like to think it'd come up.witg fault codes. If not then it might need to go.to.an auto electrican 

On 10/26/2022 at 6:05 AM, Steve Q said:

I'd like to think it'd come up.witg fault codes. If not then it might need to go.to.an auto electrican 

Yep, came up with the fault code B126514

Signal for triggering heated rear window interruption/short circuit to ground.

On 10/27/2022 at 6:22 PM, JimJnr72 said:

Yep, came up with the fault code B126514

Signal for triggering heated rear window interruption/short circuit to ground.

Definitely sounds a wiring issue then. Might be worth removing the trim in the boot to inspect the wires

On 10/29/2022 at 1:59 PM, Steve Q said:

Definitely sounds a wiring issue then. Might be worth removing the trim in the boot to inspect the wires

So I removed the trims, and everything was disconnected.  I’ve reattached everything and all is working.  I noticed there are amplifiers on both sides, but there is only a suppressor on one side.  Don’t know if that’s right or not.  Not sure why they have been disconnected. Can only assume it was done when the back window was tinted.

At least it was a simple fix 🙂

What is the history of the car James, that may explain the disconnections? 
Kind regards,

Gareth.