Do you have the service CD.??? IF not you need one to attempt this type of repair. We sell them in the partsshop. Usually it is in the memory control unit (the problem) or it can be as simple as 30 circuit power failure.

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM