hi guys just in case my amp totally fried and i get a replacement second hand can anyone let me know how you code it to the car ?
bobbobb
Coding a Bose Amp - How to...?
FWIW I’ve had a fault code on my Bose that won’t clear. I read that if you’ve replaced it, the code had to be cleared on the old one - it can’t be cleared on the new one.
good luck
good luck
This might be helpful. From the Knowledge Base -
www.ttforum.co.uk
FAQ - Bose Amp Technical Information and Repair Guides
Bose Amp Technical Information and Repair Guides - For anyone with questions about the various revisions of the Bose Amp over the Mk2 production years, or who wants to trouble shoot and repair their Amp, here's some additional information on those topics. As always, the workshop manuals can be...
www.ttforum.co.uk
Amplifier will be module #47, "Sound System". Coding, etc. will be done in there via VCDS, like any other module in the car.
Preferably you want to get the coding from the old amp and copy it to the new one, if you can. If the amp is completely dead and not communicating then you'll have to figure out the coding from what the replacement has already and what your vehicle is based on the "advice" in VCDS. There's really not that many things to change anyway--there's like coupe and convertible, cloth or leather seats, and that's really about it IIRC.
Preferably you want to get the coding from the old amp and copy it to the new one, if you can. If the amp is completely dead and not communicating then you'll have to figure out the coding from what the replacement has already and what your vehicle is based on the "advice" in VCDS. There's really not that many things to change anyway--there's like coupe and convertible, cloth or leather seats, and that's really about it IIRC.
After a bit of digging I found this old post.
According to Bose, coding is required by Audi Service as indicated in this recent email from Bose to myself while discussing Bose Amp circuit board damage...
"...after installing the new amplifier your radio/head unit has to be Bose coded, which can only be done by an Audi dealership."
"Based on the recent scan of your Audi TT we assume that you have software version 110. For amplifier generation C exists also a newer software version 120. Amplifier generation D have been improved with first software versions 150 and latest 160. If you order officially replacement by your dealership, he should only be able to get amplifier generation D with software version 160, since amplifier generation C is not any longer available at Bose."
As noted by TT'sRevenge, you can make some minor code changes with VCDS or OBDeleven under Address 47.
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According to Bose, coding is required by Audi Service as indicated in this recent email from Bose to myself while discussing Bose Amp circuit board damage...
"...after installing the new amplifier your radio/head unit has to be Bose coded, which can only be done by an Audi dealership."
"Based on the recent scan of your Audi TT we assume that you have software version 110. For amplifier generation C exists also a newer software version 120. Amplifier generation D have been improved with first software versions 150 and latest 160. If you order officially replacement by your dealership, he should only be able to get amplifier generation D with software version 160, since amplifier generation C is not any longer available at Bose."
As noted by TT'sRevenge, you can make some minor code changes with VCDS or OBDeleven under Address 47.
@ svtservices.co.uk - Thanks for your post. Any additional information you can provide on the Bose Amp would be greatly appreciated. 
However, I think the term "plug and play" needs to be clarified given there are a number of revisions of the Bose Amp and from the emails posted below from Bose, they are not interchangeable -
The email communication between myself and Bose Service can be found in an older post (link)
-- My email to Bose Customer Service -
Dear Sir,
I own a 2007 Audi TT Mk2 Roadster with the factory Bose sound system. Can you provide me with the service manual or any technical information for the Bose Amp, 8J0035223. Also, can you tell me the differences between the Revision a, c, d and e?
K/R - SJP
-- Their reply to me -
Thank you for your message. Different letters behind part numbers often advises change of hardware and/or software. Sometimes they are compatible backwards. Looking at the model year 2008 of your TT-Roadster, amplifier version 8J0035223 C and or D should be compatible. Could you please check if you find further numbers at the labels of the unit you have on hand?
-- I provided some specific data on my Bose Unit from the Address 47 Scan -
Address 47: Sound System Labels: 8J0-035-223.lbl
Part No SW: 8J0 035 223 C
HW: 8J0 035 223 C
Component: J525 Amp High H04 0110
Revision: PROD_01
Serial number: 00000000003111
Coding: 0246126
-- Here's their follow up email -
As far as we can see amplifier version 8J0035223 C is installed but also version D should work. Changes sometimes are necessary if components are changed (like radio/head unit) or improvement of performance. We remember there was an issue with navigation voicing with a certain type of radio which might have been the reason for the D version.
If your amplifier unit was damaged by corrosion you should make sure that location of water entrance will be found and corrected. Otherwise you might have an issue again with an exchanged amplifier some years later.
We checked our inventory and it seems that we still have on stock an amplifier version 8J0035223 D / 309388-001. If you like we can send it to you and if it works we will invoicing you later on EUR 170, - plus 19% (German) VAT, additionally EUR 29.99* handling and shipping, *if you are living in Switzerland.
But we have to let you know that after installing the new amplifier your radio/head unit has to be Bose coded, which can only be done by an Audi dealership. Otherwise you might not experience the Bose sound. (We do not know, if it is the coding mentioned on the data you provided.)
If you are interested to get the part from us, please let us know. Then we would check if really available.
-- Here's another follow up email -
Thank you for your further messages. We verified our data and found following information:
Amplifier 8J0 035 223 A is a different generation of amplifier - not compatible with your car.
Amplifier 8J0 035 223 C and D, same hardware but different software versions.
Based on the recent scan of your Audi TT we assume that you have software version 110. For amplifier generation C exists also a newer software version 120. Amplifier generation D have been improved with first software versions 150 and latest 160. If you order officially replacement by your dealership, he should only be able to get amplifier generation D with software version 160, since amplifier generation C is not any longer available at Bose.
(With regards to water ingress) We have only heard that sometimes leakage was discovered near the antenna, the rear window washer system or rear light and that dealers could find information in the dealer intranet portal DISS. Might be that improvements have been made by changing/adding sealings. Honestly, we do not have any detail since modifications have to be executed at authorized dealerships.
However, I think the term "plug and play" needs to be clarified given there are a number of revisions of the Bose Amp and from the emails posted below from Bose, they are not interchangeable -
• A was superseded by C on 01/04/2007
• C was superseded by D on 01/02/2008
• D was superseded by D 001 on 01/04/2015
The email communication between myself and Bose Service can be found in an older post (link)
-- My email to Bose Customer Service -
Dear Sir,
I own a 2007 Audi TT Mk2 Roadster with the factory Bose sound system. Can you provide me with the service manual or any technical information for the Bose Amp, 8J0035223. Also, can you tell me the differences between the Revision a, c, d and e?
K/R - SJP
-- Their reply to me -
Thank you for your message. Different letters behind part numbers often advises change of hardware and/or software. Sometimes they are compatible backwards. Looking at the model year 2008 of your TT-Roadster, amplifier version 8J0035223 C and or D should be compatible. Could you please check if you find further numbers at the labels of the unit you have on hand?
-- I provided some specific data on my Bose Unit from the Address 47 Scan -
Address 47: Sound System Labels: 8J0-035-223.lbl
Part No SW: 8J0 035 223 C
HW: 8J0 035 223 C
Component: J525 Amp High H04 0110
Revision: PROD_01
Serial number: 00000000003111
Coding: 0246126
-- Here's their follow up email -
As far as we can see amplifier version 8J0035223 C is installed but also version D should work. Changes sometimes are necessary if components are changed (like radio/head unit) or improvement of performance. We remember there was an issue with navigation voicing with a certain type of radio which might have been the reason for the D version.
If your amplifier unit was damaged by corrosion you should make sure that location of water entrance will be found and corrected. Otherwise you might have an issue again with an exchanged amplifier some years later.
We checked our inventory and it seems that we still have on stock an amplifier version 8J0035223 D / 309388-001. If you like we can send it to you and if it works we will invoicing you later on EUR 170, - plus 19% (German) VAT, additionally EUR 29.99* handling and shipping, *if you are living in Switzerland.
But we have to let you know that after installing the new amplifier your radio/head unit has to be Bose coded, which can only be done by an Audi dealership. Otherwise you might not experience the Bose sound. (We do not know, if it is the coding mentioned on the data you provided.)
If you are interested to get the part from us, please let us know. Then we would check if really available.
-- Here's another follow up email -
Thank you for your further messages. We verified our data and found following information:
Amplifier 8J0 035 223 A is a different generation of amplifier - not compatible with your car.
Amplifier 8J0 035 223 C and D, same hardware but different software versions.
Based on the recent scan of your Audi TT we assume that you have software version 110. For amplifier generation C exists also a newer software version 120. Amplifier generation D have been improved with first software versions 150 and latest 160. If you order officially replacement by your dealership, he should only be able to get amplifier generation D with software version 160, since amplifier generation C is not any longer available at Bose.
(With regards to water ingress) We have only heard that sometimes leakage was discovered near the antenna, the rear window washer system or rear light and that dealers could find information in the dealer intranet portal DISS. Might be that improvements have been made by changing/adding sealings. Honestly, we do not have any detail since modifications have to be executed at authorized dealerships.
I suspect Audi has coding access to the Bose Amp which is not possible with VCDS or any aftermarket OBDII device. Also, Bose probably has to say that as "boiler plate" to keep Audi off their back for making any service related comments.
LOL I dunno why they told you it "had to be done by a dealership" when clearly you sent them scans that originated from VCDS. Coding the radio for Blose is easy with VCDS, as is physically grounding the Bose pin on the HU.
As for the software revision on the amp, then it makes more sense they'd say that could only be upgraded by a stealer. Even that is technically not true for most modules--if you can source the software/code/update and have something like VCP, you should be able to do it. But not "easy with VCDS" type of thing. But obtaining the software may prove quite difficult, if not impossible.
And to top it all of the "threat" is that if you don't go to a stealer you "may not experience the Blose sound" 🤣 That sounds like a pretty good reason not to go to a stealer, if you ask me! LOL.
That said, it's nice they gave you such a detailed reply instead of just purely passing you off to Audi and saying nothing else (which they def. could have).
@ TT'sRevenge - The scans did not originate from the Bose Amp, just the Address 47 data. As noted, VCDS can not interrogate the software in the Bose Amp, which is why Bose deferred to Audi.
I've run into a similar situation with the convertible top manufacturer, wind guard company and Haldex (Borg Warner) here in Germany. They'll either say nothing at all, or they might be friendly enough to answer a few questions but stop before saying too much and referred me to Audi.
Honestly it's pretty typical so I don't take it personally. OEMs don't want their suppliers talking to the end users for obvious reasons as it could violate non-disclosure agreements or become a way for suppliers to work around the OEM which OEMs like Audi definitely do not want happening.
I've run into a similar situation with the convertible top manufacturer, wind guard company and Haldex (Borg Warner) here in Germany. They'll either say nothing at all, or they might be friendly enough to answer a few questions but stop before saying too much and referred me to Audi.
Honestly it's pretty typical so I don't take it personally. OEMs don't want their suppliers talking to the end users for obvious reasons as it could violate non-disclosure agreements or become a way for suppliers to work around the OEM which OEMs like Audi definitely do not want happening.
Ok .. leds shed some light on this ... first off - I think the original question was in relation to whether the unit would need component protection removed - to enable it to function fully ( and not just on the passengers side )
svtservices.co.uk = Bose Repair Experts .co.uk
We repair circa 300 - 400 of these a year .. and have for the last 10 years - there's not much that we don't know about them. The software versions relate to how the DSP ( onboard digital sound processor ) controller processes the sound .. the last version is v160 .. it sounds the best in relation the the revision of the board .. Software is held on the processor and right enough VCDS can't change or modify this . The EEproms store the variables - VCDS can be used to adjust SOME of the data , but not all. Thes in no reason why you can't use a v160 unit to replace ANY other software version ... if there was then the hundreds that we've upgraded to v160 wouldn't work.
I think there's a bit of miss-information above .. the 8J0 035 223 B is a completely different unit - it's manufactured by Lear and not Bose - it's only a 5 channel amp and only has one plug - it's a much cheaper unit to source but 100% waste of time as you won't get any sound from it.
Think I've started a ' knowledge war ' ... but the response intended was that they're not ' coded ' as such .. to work , unlike the A6 or Q7 . There are coding variables that will give a different Bass / Treble response curve , these are used for setting the sound in relation to interior ( leather interior variable has a lower Bass response) and also whether it's a diesel or petrol , due to background engine noise,also the clarity of the voice guidance on the RNS-e unit
svtservices.co.uk = Bose Repair Experts .co.uk
We repair circa 300 - 400 of these a year .. and have for the last 10 years - there's not much that we don't know about them. The software versions relate to how the DSP ( onboard digital sound processor ) controller processes the sound .. the last version is v160 .. it sounds the best in relation the the revision of the board .. Software is held on the processor and right enough VCDS can't change or modify this . The EEproms store the variables - VCDS can be used to adjust SOME of the data , but not all. Thes in no reason why you can't use a v160 unit to replace ANY other software version ... if there was then the hundreds that we've upgraded to v160 wouldn't work.
I think there's a bit of miss-information above .. the 8J0 035 223 B is a completely different unit - it's manufactured by Lear and not Bose - it's only a 5 channel amp and only has one plug - it's a much cheaper unit to source but 100% waste of time as you won't get any sound from it.
Think I've started a ' knowledge war ' ... but the response intended was that they're not ' coded ' as such .. to work , unlike the A6 or Q7 . There are coding variables that will give a different Bass / Treble response curve , these are used for setting the sound in relation to interior ( leather interior variable has a lower Bass response) and also whether it's a diesel or petrol , due to background engine noise,also the clarity of the voice guidance on the RNS-e unit
@ svtservices.co.uk - Great information and thanks very much for clarification on what can and can't be programmed.
From your vast experience with the Mk2 TT Bose Amps, is there anything you can recommend to help resolve the water ingress problem so many TTs are suffering from?
We have a post on various attempts on keeping water off the Amp, including the OEM "shield" Audi offers and some basic information on conformal coatings.
Your thoughts or comments are appreciated!
www.ttforum.co.uk
From your vast experience with the Mk2 TT Bose Amps, is there anything you can recommend to help resolve the water ingress problem so many TTs are suffering from?
We have a post on various attempts on keeping water off the Amp, including the OEM "shield" Audi offers and some basic information on conformal coatings.
Your thoughts or comments are appreciated!
Bose Amp Circuit Board Conformal Coating Protection
The Bose Amp issue of PCB failures has a long history with years of complaints posted in the Forum going all the way back to just a year or two after the Mk2 was introduced in 2006. Unfortunately, the Coupe stands out as being more prone this problem since it's more likely to get water in the...
www.ttforum.co.uk
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