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B6 Forum 2002-2005 Audi A4 & Audi A4 Cabriolet / 2004 Audi S4. (Audi A4 Forum, Audi S4 Forum, Audi RS4 Forum)

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Old 01-27-2008, 07:11 PM   #1 (permalink)
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Default Audi A4 2002 radio

I dont know whats up with my stereo. I can only get about 2-3 good radio stations in a city and even only 1 when i travel. When i scan, hardly anything is found! Is there something wrong with my transmitter/antenna...I need some help...and I'm not about to go to the dealer! Please...any suggestions what it could be?
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Old 02-04-2008, 08:30 AM   #2 (permalink)
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if you have an after market radio you will need an aerial amp cost around 15 quid and simple to fit.
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Old 02-04-2008, 10:11 AM   #3 (permalink)
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The factory radio is still installed....I wonder if it has something to do with the antenna on the back window. Maybe i need a new one. ?
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Old 02-04-2008, 10:47 AM   #4 (permalink)
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did you tint the back window?
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Old 02-06-2008, 02:22 PM   #5 (permalink)
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I'm having the same exact problem in my '03. Its been fine since new, until a few months ago. Its as if there's no antenna - just gets a few strong stations on FM, nothing on AM. Tape and CD are fine.

Where does the antenna cable run?
Is there an antenna amp? If so, where is it?
How do you remove the radio (to check the antenna connection on the back?).

Thanks
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Old 03-29-2008, 02:49 AM   #6 (permalink)
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I have the same problem guys. Stock stereo, was fine for a few years, then started to have buzzing / ignition noise and somewhat bad reception, now the buzzing is gone but the reception has gotten worse.

I had my car in the shop for a week and had a rental. The same stations I can't get more then 25 miles from home come in clear up to 100+ miles away when I drove from LA to San Diego.

Someone in the forums suggested this:

Scosche Industries : Car Audio Accessories, iPod Accessories, Bluetooth Wireless Accessories, EFX Hyperformance, Accumat Sound Damping, Soundkase audio backpacks, CD and DVD storage systems

I will do some looking around in the trunk to see if I can find out where the existing part is and if that is it.

The Dealer charged me $145 to tell me my antenna booster is bad, and wanted another $345 to fix it. Highway Robbery! They tell me this now after I had them check it twice when under warranty and they said they couldn't find any problem.

If anyone finds the answer please pm me.
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Old 03-29-2008, 06:27 AM   #7 (permalink)
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The aerial booster on saloon is behind the trim between the "C" pillars and connects to the rear screen aerials, a common failure but easy fix.
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Old 03-29-2008, 08:11 AM   #8 (permalink)
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Badger61- What is the "easy fix"?

I determined that it is the diversity antenna that's bad in my car.
If I remove it, and simply put a length of wire into one of the coax connectors running back to the radio, the reception comes back.

The unit is located behind a trim panel that runs across the cabin just above the rear window. It snaps off. You'll see a black rectangular box clipped to the rear window, and 3 coax connectors. Two are for antennas and one is a data/power wire. The radio sends signals to the amplifier to switch between the 2 antennas, and then chooses whichever one gives the best signal. It is not a simple "antenna booster", although depending on where you're located, a simple booster might work.

Apparently, a common problem is that the rubber that encases the electronics crack and damages the board. Mine has the cracks. I carefully peeled back some of the rubber and found at least one surface-mount component had been pulled apart by the shrinkage of the rubber. But that rubber is impossible to remove without damaging more parts. I design and build circuit boards, so I could repair it if I had a schematic.
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Old 03-29-2008, 12:41 PM   #9 (permalink)
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So jonnies I take it you are saying that the part mentioned earlier is not the problem?

Is it something more like this that is broken? eBay Motors: Audi A4 S4 Antenna Radio Booster Amplifier B5 96-01 (item 180226951387 end time Apr-23-08 15:59:30 PDT)

That looks to be for the 96-01 models so I'm curious if you found that on an 02 B6 model.

I'm sure there's an easy fix for this, we gotta be able to figure it out.
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Old 03-29-2008, 02:46 PM   #10 (permalink)
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Nhouk- That is not the part on a U.S. '05 A4. Here are pictures of the diversity antenna amp from my car. Its about 12 x 2 x .5 inches. You can see the crack in the black rubber casing near the 3 coax connectors. The part costs a couple hundred dollars from a dealer, and I have not been able to find one online.

I'm prepared to solder in new surface mount components if I could identify the proper parts. Also, its VERY difficult to remove the rubber backing without pulling more parts off the PCB.

That's why I was curious about Badger61's "easy fix"... unless he just mean it was easy to replace the unit (which it is, but very expensive).
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