The pump could have killed the pushbuttons. The other thing that will render one inop is the lack of vacuum. Check under the hood near the fuse box and make sure that there is vacuum there.

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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