need help with a cables ?

That is what the red connector is for in your picture... it connects the RNS-E to the 20-pin radio plug... and that 20-pin radio plug contains the wires that run to the back for your CD changer or phatbox.

It looks like you are just missing the connector "B" in the Quad-lock. You can simply buy the connector "B" housing and wire pins from audi and plug them in yourself.

Also included in the connector "B" are the BOSE pin and K-line connections. I'm not sure how this is supposed to work without the K-line connection for diagnostics.

Also, if your '02 S4 is a B5 chassis, you will need to connect the V-signal wire that is also part of connector "B". If it is a B6 S4, this connection is not required.

You can see a chart of which pins to connect where by downloading the install guide from my website (just click my sig).

Alternatively, you can return your PNP harness and swap it for one that includes the CDC wiring.

Never trust the pictures you see in those online shops. In most cases they use the picture for all variants of the adapter.

When you order the adapter, always mention that you want an adapter with support for a CD changer and for a phone kit. Also specify if you have Bose or not and which Audi model the adapter is for. This way you should get at least the correct connectors.

If you order a Bose adapter you won't get the brown 8 pin connector (front speakers). If you order with CD changer support then the 20 pin red connector must have pins in all three sections (there are some pins unused in the middle section but the left and right section should be fully populated). If you order phone support you should get an 10 pin black connector with 3 pins installed. And of corse the 8 pin power connector which also carries the k-line and Bose-wire.