Question about 2003 Audi A4 Cabriolet

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2004 audi a4 cabrio radio problem

Hi the radio in my a4 simply stopped working the cd plays fine but i dont get any signal from radio stations i also dont know where the ariel is mounted i would be greatful for any help

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  • dcmcjc Jun 21, 2008

    I am having the same problem with my 2003 A4 cab. The antenae must be in the trunk because the radio goes out any time I close the trunk and stay out fro several days. Any idea how to find it in the trunk




  • tohnan Oct 16, 2008

    exact same problem occurred, car had about 53K mileage, 5 years old

  • fdsafsdaf May 20, 2009

    A bit un orthodox but I wiggled the cable behind the warning triangle & it worked.
    I'll wait for a complete failure before I remove the trim

  • Anonymous Mar 29, 2014

    2008 volvo s80 cd works,aux works but no radio stations.is it the iam module in radio or the ariel amplifier in c pillar at fault ?

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The aerial is in the boot lid. A wire runs down through a thick corrugated tube. Many bends over time fatigue and break the wire. I simply found the break and repaired the wire , coax wire, repositioned the wire fine! Audi do a replacement around £100 that goes all th way to the radio!

NB handle in boot lining has a hidden screw that must be removed to pop off lining.

Posted on Oct 11, 2008

  • tomkassing2 Oct 17, 2010

    Can you further explain how to repair the antenna wire . Don't know what is a NB handle and finding the hidden screw..

  • phil Jul 14, 2012

    spot on ....stripped boot lid ...****** to find hidden screw by lifting handle .followed wires back n/s wires felt hard in places of movement ......being a tight **** ...cut and joined ...bad move !!! costs pence to replace coax wire....1m max and a bit of solder.......no more problems ....Rock on !!

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I have had the same problem on the Audi A4 Cab 53 plate, and discovered that if you remove the boot panel and then untangle the far left hand arial cable from the other cables you can isolate the fault. Disconnet the rubber cable protector between the boot lid and the boot shell. Turn the radio up high to diagnose the fault by pushing the arial cable along its length in an out until the tone changes on the radio, or you feel a kink in the cable. Switch off radio then use a craft knife to delicately remove the outer cable sleeving and reveal the outer screen wire, unravel but do not cut. This exposes an inner foil material which you can cut back , underneath this is a white plastic inner remove this with craft knife to expose broken copper core, solder and repair test radio and you have full frequency restored. Tape over inner copper repair and then twist and tape outer screen and resemble taking care with cables and save yourself £600. This took about 1.5 hours to diagnose and repair but by following these instructions probably take 40 minutes.

Posted on Jul 28, 2009

  • geddyged Apr 19, 2011

    Yes, this is all good stuff. Consistent with what I have just found. The coax, one of three of them
    is broken somewhere inside the rubber 'boot' where it joins the boot lid on the left. If I fiddle with the cables the radio kicks in for a second. I am going to have to search along each one to find where the break is. Pain in the pants. With movement at that point due to the lid opening and closing a repair will only last a while. My volume control is cattled too, but not completely yet !.

  • B188Y Apr 19, 2011

    Its worth the delicate military operation as the fix we made 2 years ago is still working perfectly and thats with opening the boot lid daily - fingers crossed it stays that way! Good luck!

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Hi Aqua 72,

I've had exactly this problem with a 2005 cabriolet.

The problem turned out to be a faulty cable running from the radio head unit to the amp/aerial.

This is a known manufacturing fault but don't expect any assistance from Audi.

The radios that Audi install are unusual because the aerial socket kicks out about 12volts which runs down the centre of a coaxial from the radio unit, around the passenger side of the vehicle to two little amplifiers which are located under the trim on the boot lid. It could be one of the amps is faulty but the culprit is nearly always the cable on Audi cabs.

If you want to check the radio is not at fault then get yourself 4 x radio removal keys (available from Halfords), remove the radio and stick a voltage meter into the aerial socket and check that there is 10 - 12 volts present - you will almost certainly find that when a voltage meter is connected that the radio will tune in.

The problem you will have here is that an upgraded loom will cost in the region og £170.00 from Audi with a statutory 4 hours to fit (mostly because the boot trim, passemger side trim, seats and gearbox tunnel need to be removed to install the new cable) which, overall will cost you about £600.00.

Personally, I took mine to Audi for a one hour diagnosis (about £80.00) then got an independant auto electrician to make and install a new lead - absolutely no probs since then.

Rgds

Lucky Ed

Posted on Oct 19, 2008

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The aerial on an audi 2004 cab definitely is not mounted behind the rear bumper.... It is inside the boot lid and the problem is in the rubber tubing just to the left of the left boot hinge. A sudden lack of radio signal is the exact problem I had. I made a small slice in the rubber tubing for easier access once I had found the kink... cut where the kink was, cut back the black plastic, then the steel enforcing wires until i got through to the white wire, cut through the white wire at the point of the kink to reveal the broken copper wire, used a bit of copper wire i had lying around to plat around the break at each end (as the wire would have been too shortened) carefully taped up each section with insulation tape, pushed it back in to the rubber tubing, used black insulation tape around the rubber tubing so you can barely notice anything has been done, and hey presto, radio is working great.... took about 20-30mins.... dont particularly see the point in soldering etc as surely these points of solder would be susseptable to breaking?!?! you may all think my version is a bodge job but works great now.... p.s. before you tape it all up/solder etc...make sure its actually working again and that youve found the right point!

Posted on Dec 29, 2010

  • nufc_24-7681 Jan 17, 2012

    Great easy fix, thanks very much.

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I had the same situation. I replaced the radio on my A4 Cabrio of 2004 because the radio was very simple and I already owned a Pioneer with a plasma screen.

After replacement the new radio did n't get any stations. After a few weeks the installer added an internal antenna under the co-driver's feet well hidden and now everything works fine. I also read elsewhere that the antenna of cabrio is on the rear glass (or something like that) and that sometimes the cable connecting it to the radio gets cuts and needs reconnection..

Posted on Sep 16, 2008

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  • Master
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Its most likely in the trunk on this model and some are connected right under the Gear shift control.

Posted on Jun 18, 2008

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Can someone tell me if I'm looking for correct areial on 2003 A4?
Is it same as pic below?
I've found both booster boxes under boot trim but no ariel
2004 audi a4 cabrio radio problem - 4_12_2016_12_40_35_pm.jpg

Posted on Apr 12, 2016

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The arial is mounted behind the rear bumper. The bumper has to be removed Therefore first go to an audi-garage. They can read out your computer if you have an serial audio fixed in your can to see what the real problem is. Sometimes the amplifer of the ariak is not wel connect enaymore or is not working correct.

Posted on Nov 27, 2009

  • Patsyno1 Aug 09, 2011

    It IS NOT BEHIND THE BUMPER - it is in the boot lid

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