cdplayer
I have a 2001 S500. Can not explain your rear light problem. However I do know that if you disconnect the battery without plugging in a reserve(or backup) battery device into the cigarette lighter, you will have to have a dealer or mechaninc with knowhow to reprogram your assessories back into the car's computor. Ie navigation, cd player, etc etc.
Do a search on my series of mishaps a while back with my S500. Search "S500 home at last ". Maybe something might click for you.
Good luck.
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