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  #1  
Old 06-15-2005, 06:38 PM
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Join Date: Apr 2005
Location: FL
Posts: 71
what's this box?

behind the plastic cover in the battery box there is what looks like the control unit, the op relay, a couple of other connectors. and a silver box with what looks like a knob on top with markings for on and off (o and |). just curious what this is for. anyone know?

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1991 190e, 2.6 (helga)
91,000 mi
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  #2  
Old 06-15-2005, 07:11 PM
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Is this it?

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1EQ0PTV2S1JL14YSTK&year=1991&make=MB&model=190-E-005&category=P&part=MAS+Control+Unit


Is called a MAS. Several circuits integrated into it. Before 1990, fuel pump relay, KLIMA(a/c) and other stuff had separate relays. They are all now in this gadget and boy does it hurt your wallet when this baby dies!
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Old 06-15-2005, 08:42 PM
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Join Date: Apr 2005
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yes, that's it. boy, judging by the price, i hope i never need one. wonder what the stealership charges.......

what exactly does it control? what's the switch on top for?
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1991 190e, 2.6 (helga)
91,000 mi
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  #4  
Old 06-16-2005, 12:44 AM
carson356
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mas relay

the two basic thing it does are:
it replaces the fuel pump relay, and the a/c klima relay. so it controls the fuel pump and the a/c compressor, i am sure it does more, i have only had issues related to the a/c and fuel pump control.

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