Hi Cr,

The auxiliary pump in the SD controls the door locks. That has been dead since I've owned the car, about 4 years. The main vacuum pump in my car doesn't do the door locks, but virtually everything else.

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dannyf
1984 Mercedes 300 SD 214 K miles. Runs on WVO ~ 22 mpg over 8 K on WVO
1997 VW Passat TDI 156 K miles. Uses biodiesel and diesel. ~ 41 mpg
1996 Mercury Villager gasser. ~ 20 mpg