Does anyone know what this MAS switch is for??

[KLP 92]

Can anyone tell me what this switch does?
Its located in the ECU compartment on the passenger side next to the windscreen.

The car is a early 90's 500SL R129 shape. there is no air mass sensor that i could find in the air system but i found this switch and wandered what its for?

 

[uumode]

MAS control Unit
http://www.webinsiteserver.com/Merc..._Code=011545853288&Category_Code=Control+Unit
I 'would have' thought it is air/mass related
(Mass Airflow Sensor..the acronym is kinda shouting it)

 

[teky]

nothing in the book about it apart from it being a AIR MAS METER control unit, i cant understand why it has a switch on it apart from it could be something to do with performance to enrich air flow, interesting ill have to look into it

 

[V12]

Its main job is a fuel pump relay...
If you twist it, the outer metal casing will push the unit out, it is basically just to lock it down into the plug securely...AFAIK

 

[teky]

that sounds like a good enough answer to me, a lock ... dont get many of them engines to play with