300SL (129.061) L6-3.0L (104.981) (1991)
Air Door Vacuum Solenoid Valve: Description and Operation
SWITCH OVER VALVE UNIT (Y11, 15-POINT):
Switchover Valve Unit (Y11, 15 Point)
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The 15 point switch over valve unit controls the air flap vacuum elements. In this first-ever application, the switchover valve unit is controlled by
serial data transmission via one circuit, also called multiplexing. A specific sequence of different voltage impulses are used to control the valves.
The electronic circuitry of the valve unit recognizes these voltage impulses and actuates the appropriate valve