AC button, function - GF83.30-P-2103-01GH

Function 

Pressing the AC button ( ) switches on the cooling mode.

AC button ( ) pressed

Diode is illuminated, cooling mode/air dehumidification, refrigerant compressor ON

AC button ( ) not depressed

Diode not illuminated, no air dehumidification/no cooling mode, refrigerant compressor OFF 

The AC button ( ) is connected to the A/C control module, which regulates the refrigerant compressor through the all-activity module. The refrigerant compressor is only active when the engine is running and the blower switched on. To be able to determine the cut-in point for the electromagnetic coupling on the refrigerant compressor, the all-activity module must receive additional data from the CAN bus, such as, e.g. the engine speed.