How to Install an A4 Stereo

1. Pull the release handle under the dashboard on the drivers side of the Audi. Move to the front of the car and lift the hood. Turn the bolt on the negative battery cables clamp two full rotations with the 10mm wrench. Lift the cable from the battery and move it to the side. Return to the A4s cabin.
2. Insert the four stereo removal keys into the slots near the corners of the stereo deck. The keys are available through Audi or Volkswagen dealers, as well as through aftermarket car audio outlets.
3. Place two fingers from each hand inside the rings at the ends of the keys. Pull out on the tools to engage the release mechanisms on the sides of the stock radio while pulling the unit from the dashboard.
4. Pull the stereo wiring connectors by the plastic wire binders until they disconnect from the outlets on the back of the Audis head unit. Remove the antenna cable lead from the outlet on the factory radios rear panel.
5. Slide the installation cage into the A4s stereo mounting dock. Push the metal sleeve into the dashboard until the front edge is level with the face of the dashboard. Fold the metal tabs at the corners of the cage with the flat screwdriver to secure it into the dock.
6. Gather the stereo wiring and antenna cables from inside the stereo dock. Pull the cables to the front of the installation cage. Plug the stereo wiring leads into the wiring harness adapter. See the adapters manual for correct connection locations.
7. Connect the wiring harness adapter lead connectors to the outlets on the rear panel of the aftermarket stereo deck. The wiring harness leads can only connect to the stereo unit one way. Insert the antenna cable lead into the stereos antenna input.
8. Push the stereo unit into the installation cage until it locks into place within the Audis stereo dock. Return to the engine compartment.
9. Replace the negative battery cable clamp onto the A4s negative battery terminal. Tighten the bolt at the end of the clamp with the wrench and close the Audis hood.