I am having Bose amp problems in a 2003 A4. Does anyone have a pinout diagram for an older Bose amp, like p/n 8D0 035 225 from a B5? I found an amp out of a 2002 TT (p/n 8N8 035 223), but when I put it in the car only the front speakers work. My initial research suggests the pins aren't the same like I was told.

I've heard the 8D0 035 225 from B5's will work and they are certainly more plentiful out there, but I would like to verify the pin diagram before buying.

Thanks

 

Hopefully this post helps.

https://www.audiforums.com/forum/diy-do-yourself-55/adding-sub-amp-bose-system-37033/

Doug

 

Thanks, Doug. I found the diagram in that post yesterday (incidentally for a 2000 S4). It seems to match up completely with this diagram:

http://www.audicrazy.com/B6A4/Bentle...4_B6_Radio.pdf

...with one exception: terminals 11 and 24 seem to be switched. Is this an error in one of the diagrams? It's hard to believe Audi would keep the A4 connectors the same between B5 and B6 except for ONE wire.

I haven't examined the colors of the wires in the car yet, but I will this weekend. Also, I remain skeptical/frustrated that the TT amp doesn't work in the system, but I suppose the TT might not have as many speakers (?).

Ryan

 

OK so comparing all diagrams from all sources, diagrams 1 and 2 are from B5 sources and diagram 3 is from a B6 source. So from these diagrams, I would have to assume that on the amp, 11 is open, connecting to nothing and 24 is ground according to the first 2 diagrams and not switched as you have stated, unless your definition of switched is different than mine. Switched to me is 12V +ve when the ignition is switched on.

From what I can tell, all you should have to do to make the B5 amp work with your B6 harness is move wire 11 to position 24 in your harness.

It would make sense than nothing is powering up because the ground is missing not allowing the amp to complete the circuit.

Now to throw a wrinkle into the fray, you have a Bose amp from an Audi TT so this may all go out the window. Without the harness diagram for the TT we have no way of knowing if these all match up so with that said, just as a disclaimer, please use this info at your own risk. I won't be held responsible if something goes pop.

Good luck and let us know how you do.

Doug

 

Yep, I agree with that assessment. I bought a B5 amp, so we'll see what happens when it gets here. I'm considering the TT amp a lost cause. The pinout for those amps doesn't have anything coming out of pins 20-24 (rear speaker power on the A4).

I'll post what happens with the B5 amp. Thanks.

Ryan

 

The B5 amp works without modifying the B6 harness at all. Based on the diagrams discussed above, I'm not sure why, but I am not complaining.

Thanks for the help.