I had almost the same problem with my E420. Most likely your wires are fired together like mine were in the rear of the car. I had to rewire everything from the Convience Comfort Unit under the rear seat to the trunk. Take the time and expose the wires that runs on the driverside rear deck to the trunk. Im sure you will discover that the wires that runs to the trunk light, rear interior roof light, tail lights and power antenna will all be fired. Mine was so bad that it keep burning out a fuse before my eyes. It will take a while but take your time and cutout all the bad fired wire and replace it with new wire. Dont take any chance by trying to use the bad wire at all, save yourself the headache and just cut it out. After running new wire to the trunk light and etc.. your E will be as good as new with no electrical issues.

In addition, you will need to buy another Convience Control Unit because most likely your circuit board inside is fried.

Good luck!