The dashes are probably your prompt to enter the four digit code to enable the radio. Once the 12V battery power is removed, you have enter a code that came with the radio to enable it. The dealer should have the code if you don't!
The faults codes for the radio display E1 thru E5 and refer to specific faults in the radio system.
Just added the DTCs to my page: http://pages.prodigy.net/jforgione/MB_S500.html
Click on #9. These are good for Becker radios between 1991 and 1993.
Tnx for the info, Steve.
[Edited by JimF on 04-29-2001 at 01:11 PM]