I recently bought a 2002 CLK 320 with 39,000 miles. The only problem with the car is the radio head display did not work. I just replaced the audio head unit with another MB head bought off e-bay. Everything works fine, except 3 things: 1) Does not shut off when the car is turned off and key is removed 2) Display does not illuminate when headlights are turned on 3) Audio screen on multifunction dash display does not work. If just has 4 dashes under the Audio title.

Any ideas on what is wrong? The system works and sounds great, just seems to need to sync with car somehow.