LongPete

Posting here since the I figure the A4s (sedan, wagon and Allroad) have the same or similar radio control units.
Have a 2015 A4 Allroad and was told by the dealer than the radio control unit needs to be replaced. I

Here is some background info so a knowledgeable person here can give me advice:
- Was getting a "low battery" warning (last 6 months) when I shut the car off but kept the radio on. One day, the MMI blacked out, then came back on. Ran for a few days, then balcked out again.
- Currently with a reset, I can get an occasional flash from the screen. I see a display for a second, then it goes black. Has been 1 month now.
- CD player inserts and ejects CDs. Can hear the mechanism turning
- Checked all fuses
- Lighting around the controls near the gear shift is off
- Battery was low 12.3 V to 12.5 at rest but the repair shop (not the dealer) charged it overnight and said it was still good
- Amp in the trunk is dry

First question - Where do I find the radio control unit? I the trunk or in the dash with the CD player? Is it what I think is the amp - behind the driver's side rear trunk panel?
No guidance online.

Finally took it to the dealer said last week. Radio is defective they said. Said they put the ringbreak jumper on the radio module to diagnose it.
Replacement is $2400 taxes included ($1800 for the radio + $300 labour + taxes).

If radio replacement is the only option, I have a few other questions:
Can it be repaired at an elecronics shop?
If I replace it, will it need to be recoded?

Thanks for any thoughts on any further troubleshooting, testing AND for feedback on compatible units if that is the only choice.
Thanks Pete

SMac770

The radio tuner and sound amplifier are in the left rear in an MMI vehicle. The unit in the dash in an MMI 3G vehicle is the J794 MMI control module, with the SD card slots, hard drive, DVD drive, etc.
If you have the standard sound system (no tweeters in the front door mirror corners) PR 9VD, then the speakers are using the 6 amp channels built into the radio unit R. If you have the B&O sound system (1" tweeters with silver rings in the front door mirror corners) PR 9VK, then you have one radio tuner R and one separate J525 amplifier.

https://audi.7zap.com/en/usa/audi+a4...0/035-35044/#3
Here's one example listing. Without your PR code for your radio localization (PR 8xx), it's guesswork at what part number is on your radio.
US PR code is 8DY, thus why I picked that page. We see for 8DY+9VD + QV0/QV9, the part is 4G0035056J. For 8DY + 9VK + QV0/QV9, the part is 4G1035053J.
If I look up a 2015 A4 allroad in the US and search for radio control unit, we see the same:
https://parts.audiusa.com/productSea...imlevel=150526

There's also the entry for 8DY+QV8, if satellite radio capable. What we see is a single unit without regard for 9VD vs 9VK.
https://parts.audiusa.com/p/51128847/4G0035080G.html
Got me. This is the point where you look at your unit in your vehicle and run with that. Unless you happen to have the complete PR code dump for your VIN from your dealership. Because that PR code sticker Audi puts on the cars is very incomplete.


But once you have the part number, you just need to source one and then pay the dealership an hour to remove the component protection.
Even if you needed the more expensive one for the 9VD system, it's only $1100 new from a dealership level source:
https://www.genuineaudiparts.com/oem...nit-4g0035056j
But I guess that's almost $1500 if you're talking Canadian dollars. So if that dealership is charging $1800 CAD, that's not all that bad. Though do you really need a brand new one?

LongPete

Wow SMac. Awesome info! You know this car well.
Thanks for the links and details on figureing out the sound system. The 7zap diagram was very helpful. I only have 1 unit in that location so likely just the radio unit; no amp and no TV tuner.
You are right. I don't need a brand new one. Even the dealer said, "It's pretty pricey, you can probably find an aftermarket, but don't ask me where, we don't have any contacts in that department."

One question - A Note in the 7zap list said - left rear 4G0 035 082 G in the (1) PR-8DY+QV8 category. Do you know that that note and part ID number means? Is it an equivalent?
I have sourced a 4G0 035 082 radio locally. If it fits, I'm going to jump on it asap.
Thanks again.

SMac770

There's nothing more valuable information wise than pulling the screws and looking on the bottom/side/wherever of your current radio unit to know what your legitimate options are. Because you are in Canada and not the US, though both are always close as they are the NAR market, but any specific variation can mean nothing or everything.

What you're seeing there with 080 vs 082 is there's one part number one actually orders and the cars are built with according to Audi. But the unit might also have a different number marked on the actual device.

So https://parts.audiusa.com/productSea...erm=4G0035082G brings up nothing because Audi doesn't sell such an inventory number.
https://parts.audiusa.com/productSea...erm=4G0035080G brings up the radio unit
But on the used market, you're not likely to find people selling 4G0035080G, because what's on the actual unit is 4G0035082G. I have no idea why this scenario exists, but it's common with Audi infotainment components.

I have some concern with the unit. Notice the prices of the units:
080G aka 082G -> https://parts.audiusa.com/p/51128847/4G0035080G.html -> $1040
053J -> https://parts.audiusa.com/p/51129761/4G1035053J.html -> $1041
056J -> https://parts.audiusa.com/p/51128754/4G0035056J.html -> $1454

The 056J unit, which would be with the standard sound system and without satellite radio is a lot more. What we know is that configuration, the 6-channel amp is built into the radio. Is that the price difference? So if you put in an 080G or 053J, you won't have any sound because you don't have an external J525 amp (part 2 in the ETKA diagram).

Also, you say 082 without any revision letter. The letter, if present, is always equally important as all the other numbers. Notice this eBay listing for an "4G0 035 082", https://www.ebay.com/p/1822204829, the date stamp on the unit is Jun 2010. I wouldn't put that in my 2015; I have no idea the complications that might arise. Additionally, this is for an A6 from the MMI 3G days. You have MMI 3G+. Here's the version I would pick, rev G, the one that would be in your car if your car had an 080/082 unit: https://www.ebay.com/p/1779842685

I think you need to know the part number on your current unit to better gauge your options.

LongPete

Again, thanks for the great advice.
I pulled the unit and it's a a 4G0 035 082 G. I found a few used ones online. The one below looks like a close match. LKQ is selling it (a known company), plus it's in Canada already so no border fees. Although not new, I'm willing to try it out for 90 days to see if it fixes my MMI issue.
The post says it doesn't fit the A4 Allroad but the unit numbers all match and it comes from a 2014 A4. Manufactured 9 1/2 months before my current unit. The seller promises 30-day returns (not incl. shipping and restocking fee) and a 90 day warranty.


Old unit on top - new unit number on bottom

SMac770

They are both the same part number and revision, I see no reason for it not to be the exact same unit and to slot in without issue.
Yeah, we have LKQ here (one of their locations is across town here), though I never thought about them beyond engines and transmissions.

That's really interesting that you have the 080/082 radio and no external amp. So the 080/082 must have the built in 6-ch amp section for the 9VD sound system. But why then would the 056 be so much more expensive than the 053 and 080/082? Maybe they all are amp equipped and the 056 price is just an economy of scale issue?

LongPete

Just so I understand better.
If that unit is radio and amp, there is only 1 other unit - MMI and CD unit in the dash, correct? And that is where all the other functions are? Nav/GPS, bluetooth/cellphone, media
To note the 080/082 unit was used for many models including the VW Touareg. Maybe it is economy of scale.

FYI - my car does have speakers in the front near the mirrors - they don't have 1" silver rings - they are triangular .

speaker near the mirror

SMac770

No, no you don't have speakers in the sail cards. That's the cover for when there is no tweeter there: https://www.audizine.com/forum/showt...1#post14142700

So you would have the 9VD standard sound system, with 10 speakers and 6 amp channels: https://www.audizine.com/forum/showt...1#post14156251

Well, in the US at least. I don't know if Canada would actually have the low end Basic or Basic Plus sound systems, which have no center channel in the dash and no subwoofer.

Yeah, in such a config, there's the J794 MMI 3G(+) control module in the dash and the R radio/amp unit in the rear. All the rest that one might have such as in my MMI 2G system, it's all integrated into the J794. Similar to how they integrated a number of modules into the J519 at the B8.5 refresh.

RRHMJ23

I'm not Sure if you're looking for a aftermarket replacement radio, but look into RSnav, they make replacement units for audi a4. I have one and it works well.

4lane

This is a great recap of part numbers @SMac770 - I'm hoping to get your help on a similar topic. My radio tuner went on my 2013 Premium Plus Allroad with B+O audio with front tweeters, Nav, Sirius sat radio. I'm having trouble determining the right part number. I pulled the unit and I can see it was replaced before since it is stamped 2014: 4G0035080D. However, if I look up the part on VW Parts it gives me a number of 056 options: https://tinyurl.com/mbfzwnyn. There seem to be a lot of revisions in the Y2012 which is adding to the confusion. Do I stick with the part number on the old unit (4G0035080D) even though it's from 2014 and for a A6/S6 per VW parts (this part is difficult to find), or else, how can I determine the original part number? Thanks all!