GF83.10-P-2114-01C Valve block, function  

Function
Four switchover valves are integrated into the switchover valve block (Y11). A separate line from the pushbutton control module to the switchover valve block is present for each valve (Y11).
The voltage pulses are sent by the pushbutton control module (N19/1).
The electronic circuitry in the switchover valve block (Y11) recognizes the voltage pulses and actuates the corresponding switchover valve which supplies the corresponding vacuum element with vacuum.
 
The following vacuum elements are actuated:

Diverter flap center nozzle vacuum element
Vacuum element for fresh air/recirculated air flap
Vacuum element for left center nozzle blend flap
Vacuum element for right center nozzle blend flap