HI PLEADSE HELP I HAVE AN MERCEDES E200 03 EVRYTING WAS FINE UNTIL TODAY MORNING I WHENT TO THE CAR AND THE RADIO WAS ON PLAYING MIUSIC SO I TRAID TO TURN ON THE ENGINE AND THE BATTERY WAS FLAT SO I PUT ON THE JUMPINGLEADS AND MY CD RADIO STOPPED WORKING I PUSH THE BUTTON ON/OFF AND NOTHING IS HAPPENING I WAS WORKING FINE TILL TODAY MORNING AND ON THE LEFT HAND SIDE OFF THE BACK LIGHT ORANGE LIGHT IS ON ALL THE TIME SO PLEASE HELP THANK YOU

SOURCE: 1998 beetle radio buttons

The face plate buttons actually activate small buttons on a printed circuit board behind the face plate. When I removed the radio and then the face plate many small pieces of plastic fell from behind the face plate. These small plastic pieces align the face plate button to the printed circuit board buttons. My Beeetle is almost 10 1/2 years old so I imagine the plastic is just becoming brittle with age. I could not set the radio to FM, so I removed the face plate button and now slide a toothpick in the slot to toggle between FM1 & FM2. Not he best solution, but probably the most inexpensive one. I also made my on tool to remove the radio from a diagram found at: http://www.alientech.net/nbinfo/stereo.html

SOURCE: Toyota RAV 4 1.8 A - engine doesn't start after battery exchange

may sound like a dumb question but you didnt by chance hook up the battery or jumpstart the car with polarity reversed by accident at some point during this process? i would check all the underhood main fuses and interior fuses as well, what is the condition of the battery post clamps? if they are badly corroded be sure to clean them very well and wash them with a baking soda and water solution im thinking one of the cables or smaller wires that hook up at the battery is broken or possibly some freak accident happend and the computers need to be flashed at a dealer. either way i wish you luck please rate -jeff

SOURCE: Mercedes S320 central lock

The Key Fob needs to be syncronised to the car........Try this it works for many Mercs1....ensure the battery in the "Key Fob" is OK............Press either Lock or Unlock button for more than 1 second, the lamp on the fob will light if OK. Change battery if it does not illuminate!  2.....if battery on fob OK.......Re Syncronise the key fob to the car by:.... a brief press on either button twice and within 30 seconds turn Key to position 2 on the ignition lock 
Hope that fixes it...let me know?

SOURCE: After dead battery, radio won't work. lights...

you need to call your local dealership and they will give you the code to reset you radio.. good luck keith..p.s. remeber to write down the codes, that way if it happens again you will have the code for the radio..

SOURCE: After dead battery, radio won't work. lights flashing

First I would try to disconnect the negative cable and then reconnect the cable. See if it resets.