The most common problem here is the for the fuse that is in the top of the green relay to fail. To check you will have to take the top off of the fuse panel. You will have to take off the lid and the 6 screws that hold the cover on. Replace the 15a fuse with a 20.
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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope

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