SMac770

They perform no function for that specific electronic in that vehicle. Likely not connected to any PCB circuitry. But even if they were, doesn't mean the software load operating is going to use them. They're not going to make custom surface mount headers. That 32-pin is just an industry component for a buck a pop - example, https://www.ebay.com/itm/334752512190

lohikaarme8

8T0 035 223 AE pinouts?

SMac770

8T..., so that's going to be a B8 amp, not a C6 amp. With optical, so for MMI. Without 18-pin, so not B&O. But MMI 3G without B&O doesn't use a J525. So that must be for the MY08 and MY09 years with MMI 2G. But again, it's still a B8 unit, not a C6 unit. No idea if the C6 infotainment system will know how to talk to it.

1 and 2 are like all the B8 amp, 12v and ground.
sub is 3 (+) & 15 (-)
FL is 4 & 16
FR is 5 & 17
RL is 6 & 18
RR is 7 & 19
dash center is 8 & 20
ring break is 27
AUX left in is 24, left ground is 29, right in is 26, right ground is 31
mic in is 23 & 28

lohikaarme8

Is 1 pin permanent +12V and 2 pin ground?
Are 4 pin FL + and 16 pin FL -?
Are 5 pin FR + and 17 pin FR -?
Those are what I need to but rca converter.

lohikaarme8

The car is audi a4 b8 2009 and no bose or b&o sound system.

lohikaarme8

5 pin and 17 pin is empty🤔

SMac770

Oh, you're not the OP. And you must not be in the US, as it appears you have the basic plus sound system (no center, no sub).

Yes, pin 1 is term 30, direct from battery.
FL is 3/15
FR is 4/16
RL is 6/18
RR is 7/19
Yes, that's +/-