I have 1995 S420. My auto door shut and power antenna stop working. I am able to unplug the fuse #9 in the trunk for 10 to 20 seconds and Auto door shut for a while and problem start back again. But my power antenna doesn't raise any more. I also noticed that driver side door doesn't unlock with remote.
Any advice and suggestion will be greatly appreciated.

Thank you

The vacuum pump that runs that system has likely failed, and disabled itself. That is why resetting the fuse will get it to work again briefly.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

any idea how to fix Vacuum pump?

I don't believe it can be repaired, you need a new one ($$$$$) or a good used one (a bit less $$$)

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)