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Some early Seat Leon 1P Facelift cars with Media-In functionality (AUX, USB & iPod support) suffer from a problem where the mid-tones on the left channel are missing when listening to analog audio through the AUX input, which includes listening from an iPod with the iPod adapter cable. This can be resolved in a couple of minutes by replacing the old AUX port with a new and fixed revision.

The problem is a faulty circuit board in the combined USB/AUX port (CUP) panel, where the lines of the 3.5mm stereo plug are incorrectly wired. The left channel is flipped with the right channel, and even worse, the right channel is flipped with ground.

To solve this problem, you need to replace the original panel (part# 1P0035726 GB1) with a new revision that you can order from your dealer under part# 1P0035726A GB1 (make sure it’s the revised “A”-version) for about 35€. This can be done relatively easily and quickly, which I’ll show you step by step:

Step 1 (Picture 1): Remove the right cover of the center console by pulling down the underlapping part marked with the orange arrows until it snaps out. Then, pull at the yellow circled area to free it from two plastic clips.

Step 2 (Pictures 2-4): Insert a flat screwdriver into the magenta colored hole (2a). You need to press and release a hook on the panel that is located behind the green circled area (2b). The hook can be seen in picture 4 and locks the panel into the center console. You don’t need to apply strong force.

Step 3 (Picture 5): Once the hook is released, pull out the panel starting from the right edge. Again, do not brute force, it comes out very easily.

Step 4 (Picture 6): Unplug the two cords from the panel by releasing their locks, plug in the new panel and put everything together the other way round.

Enjoy your newly gained high fidelity!


Comments
Posted at 15:22 February 10, 2016
Alan
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Author

Brilliant info as i had exact problem highlighted and now sorted thank you so much

Posted at 22:49 February 28, 2016
Ahmed
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Author

Hi. I’m having an issue in my 59 plate Leon. The USB function works, but when the auxiliary is plugged in, it says media loading then gives up and reverts back to radio. Any ideas? Thanks

    Posted at 11:04 February 29, 2016
    Mario
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    Author

    Mine has the same issue, and that’s because for reasons unknown, it doesn’t support ordinary AUX input. The AUX socket can only be used in conjunction with an iPod through the adapter cable, and “media loading” means it’s searching for an iPod but can’t find one and thus switches back to radio.

      Posted at 01:40 March 1, 2016
      Ahmed
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      Author

      Hi Mario. Thanks for the reply. Does this mean that my Seat doesnt accept direct aux in for example through my samsung phone? and is this the same for all the Leons in this year/model. Thanks

        Posted at 17:29 March 1, 2016
        Mario
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        Author

        Yes, that’s what it means.

        Here’s a rather complicated workaround that I’ve use for some time: Get an iPod adapter cable (from Seat or BMW) and an old iPod with at least 1 song on it, connect it to the USB, and then you can connect you phone to the AUX IN. This will work but display the track title of the iPod on the car displays.

          Posted at 15:20 March 30, 2016
          Ahmed
          Author

          Hi mario, thanks for the reply, i will give this a try. Is it possible to add Bluetooth for music to the original head unit?
          Also could you recommend a BMW/seat cable please?

          Thanks

          Posted at 02:23 April 30, 2016
          Mario
          Author

          Hi, there are no easy ways to add Bluetooth to the original headunit… I built a custom Bluetooth adapter for the ipod interface where I connect my Android phone to, but that requires some electronics tinkering and I haven’t published the build instructions yet. As for the cable, just search for “bmw ipod cable” on Amazon, there’s already plenty of cheap aftermarket cables available… they have the iPod dock connector on one end and a USB and 3.5mm audio jack on the other end.

Posted at 15:18 March 30, 2016
Ahmed
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Author

Hi mario, thanks for the reply, i will give this a try. Is it possible to add bluetooth for music to the original head unit?

Thanks

Posted at 21:38 November 2, 2016
Luke
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Author

Mario, great to find an actual solution to this problem on your page! Can you advise where I can buy this part from? As I have tried looking on the web with no joy! Thanks, luke

    Posted at 23:54 November 2, 2016
    Mario
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    Author

    Hey, I couldn’t find it on the internet either, so I got it from a local car dealer… you can also try VW or Audi dealers, they should be able to order Seat parts too.

Posted at 21:33 August 18, 2017
@alv1ra
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Author

Ohhhh!!!i have this problem! It’s fantastic! Now aux is perfect! Thank you

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