How to Install a Radio for an Audi A4

1. Remove the existing radio. In most cases, an Audi radio removal will require the use of European radio removal tools. These can be purchased from many auto parts stores, and may be ordered from the dealership as well.
2. Inspect the factory wiring harness. Make sure that the factory harness will plug into the aftermarket radio harness with ease. Also, check the antenna adapter to ensure a proper fit.
3. Connect the aftermarket radio harness to the vehicles radio replacement harness. Solder all connections and insulate them with heat shrink tubing or electrical tape.
4. Mount the dash kit to the vehicle using the hardware provided. In some Audi models, the dash kit will secure itself using plastic clips, and no additional hardware is required. In other models, screws are necessary. Any necessary hardware will be included in the kit.
5. Plug the aftermarket harness and antenna adapter into the vehicle. Connect the remaining end into the radio. Place the radio into the dash kit and slide the unit into place. Test the new radio thoroughly for function to ensure a proper installation.