How to Install a CD Player in an S500

1. Lift the hood of the Mercedes to access the battery terminals. Loosen the bolt that secures the negative battery cable to the negative battery terminal with an adjustable wrench or pliers. Remove the cable from the battery to avoid shorting the S500's electrical system during installation.
2. Slide the two flat Mercedes stereo removal keys (also called DIN removal tools) into the slits at the bottom corners of the factory radio. Push each tool into the openings until they lock into place.
3. Place your fingers in the loops at the ends of each respective key and pull outward. Maintain the tension on the keys while pulling the factory unit from the dashboard stereo dock.
4. Disconnect the wiring connectors plugged into the outlets on the radio's rear panel. Unplug the antenna cable from the back of the unit.
5. Slide the aftermarket stereo kit or installation sleeve into the empty stereo mounting dock. Place a flat screwdriver under the metal tabs inside the sleeve and bend them outward to secure the sleeve within the dock. Pull the stereo wiring and antenna cable from the back of the dock to the front of the Mercedes' dashboard.
6. Connect the stereo wiring to the wiring harness adapter. Plug both wiring connectors into the appropriate leads of the adapter.
7. Connect the wiring harness adapter lead connectors to the corresponding outlets on the back of the new CD player. Plug the antenna cable into the FM antenna input on the back of the new unit.
8. Slide the CD player into the sleeve (inside the vehicle's stereo dock) until it locks into place. Return to the S500's engine compartment.
9. Place the negative battery cable clamp back around the negative battery lead post. Tighten the clamp to the post using the wrench. Close the hood.