Install guide

2.3 Audio Wires

The existing CD changer harness already contains three wires that take audio signals from the trunk

to the headunit. This installation will take advantage of them. The CDC plug is in the left side trunk

panel kind of tucked up behind the tool kit. It is a large plug wrapped in grey foam. Pull it out and

remove the foam cover. The custom wiring harness created in this step will have a female 13-pin DIN

plug that mates to the CDC trunk plug. The other end of the custom harness will be the connector

T8s. T8s is a small black 8-pin plug arranged in one row of 8 pins. This plug and new wire terminals

can be purchased from Audi. Refer to the wiring diagrams for a visual description of the proper wiring

pinouts described in this subsection. Prepare 3 lengths of wire with new wire terminals on one end

only. Solder the loose ends of these 3 lengths to Pins 1,3,4 of the Female 13-pin plug. Slide the outside

cover over the Female 13-pin plug. Connect the new wire terminal end of these 3 wires to the new

wire housing T8s in this order:

Female 13-pin DIN Pin 1 to Pin 7 of T8s (R CH sound)

Female 13-pin DIN Pin 3 to Pin 6 of T8s (L CH sound)

Female 13-pin DIN Pin 4 to Pin 5 of T8s (Spk GND)

Wrap the wires between the two ends of the harness with electrical tape. The custom wiring

harness that plugs into the CDC plug is complete. Plug the round 13 pin connector end into the

CDC plug in the trunk and wrap them with electrical tape to prevent them from separating.

There are two more wires to connect to T8s in the next subsection.