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 ...