This has been an on going problem. With engine running, driver's door locked, the car shuts off fine. With the door unlocked (knob up) she'll keep running. At which point if I push down the lock, it takes a few seconds but she slowly dies. Now, I have looked at the factory CD and there is no diagram of the system and how it is connected to the engine shut off valve. The Haynes manual had a diagram of just the central locking system. The diagram in the Performance Products catalog is even more vague. I took the door panel off and under the dash panel off to trace the lines. The only thing I can see that the 2 system share is a rubber "tree" where by one line goes in and 3 come out. The incoming line is right off the main trunk from the pump. The 3 coming out are 1 green/yellow line, that disappears into the dash somewhere. The second one goes to some sort of check valve/splitter It's yellow and has 2 or 3 lines coming off of it. One of those lines (all yellow) goes to the driver's door lock. And the third shoots up to the ignition which of course has another line that goes directly to the shutoff valve. Anyone have ideas. I don't want to just throw parts at it. I think the actuator for the driver's door is like $29 and it's just a 2 inch long plastic tube with a metal plunger in it.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member