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MAS Module

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by mikemartin1939, Dec 10, 2012.

  1. mikemartin1939

    mikemartin1939 Member

    Likes Received:
    Nov 29, 2012
    Palmyra, VA
    Your Mercedes:
    500SL/1991/8 cyl- SL500/1999/8 cyl
    1991 500SL has an MAS module in the right side electrics compartment. It has a rotary knob on top the allows a selection of I (in?) or O (out?). What is the modules use, what does MAS stand for and what effect does the I or O have?

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