Thanks Tim.
I want to retro-fit an AUX port, as the car did not come with one. It is a 2011 S40 T5 with the standard Performance sound system (single CD player), no AUX option. So no AUD amp, just the IAM (Integrated Audio Module).
Comparing with the diagrams for the High Performance/Premium sound system, it appears that the AUX port plugs directly into the IAM. So, I just want to physically check if the IAM on my car has the necessary plug/pins or wiring that I can use to add the AUX port.
The above diagram was a random page. I'll post the pages I am referring to below. 126, 127, 130, 131