My car had a problem with the drivers side window not going up. Sounded like a switch problem to me. I thought about buying a new switch but ran across a DIY which I'm sure you've seen.
http://www.grill.org/rodney/mclass/mlswitch/index.html

Anyway, I was having the famed machine gun lock issue, too. The rear passenger door lock was not functional. After doing the DIY, it works again.
Might be a coincidence, but I thought I'd let you know.

It's a $100 switch assy. from Mercedes Benz I would just replace it.

You must be kidding... I fixed it for free. If I spent $100 for everything I could get for free I would be a poor man.
I just was trying to let people know that this MAY also fix machine gun lock issues.

How much is your time worth ????

How much is the satisfaction of having fixed it yourself worth?

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1973 280SE 4.5 (Sold)
1984 LWB 280GE (Sold)
2000 G500 NMLE - "Deep Throat"
2007 ML320 CDI (Sold)
2010 Porsche Cayenne S Transsyberia TipTronic (Sold)
2010 Audi Q7 3.0 TDI (Sold and Sorely Missed)
2014 ML350 BTC
2015 Audi Q7 3.0 TDI (On Order)

Priceless

I totally agree... it's priceless fixing it yourself.
Also, it takes 10 minutes more time to fix the switch than to replace it.
It takes an hour to get to the dealer and back.

I replaced the switch module in my 99ML and the 99ML that my girl friend has. It is a fairly easy job. A friend of mine went the repair route, pulling the copper contacts back into proper contact position and he was happy with that. Just a note, the switch module is available from Phil at Fastlane, our parts source here -- and there is no shipping. The price is quite a bit lower than standard MB dealer pricing....... Ben Carter

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Ben Harrison Carter
1999 Mercedes ML320 87K
1992 Mercedes 300CE 89K
1995 Corvette 29K -- Sold Dec 09
1989 Mercedes 420SEL 99K -- (Sold 4/08)
1968 Mercedes 230S (106K) (Sold 9/06))
1976 Mercedes 450SEL 130K (Just sold - 06)
1961 Mercedes 220Sb (sold years ago)

I vote for coincidence. I don't believe the window switches are in anyway related to the door lock issue. I had the machine gun lock issue and i just can't make a connection between the two. Then again, i am highly mechanically DISinclined.