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Home >> Mercedes Benz >> 2001 >> S430 >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Climate Control -- Basic Knowledge -- 215 & 220 Chassis >> Basic Knowledge >> AC OFF button, location/task/function - GF83.40-P-2107I >> AC OFF button function - GF83.40-P-2107-01IA

AC OFF button function - GF83.40-P-2107-01IA

Function 

When the AC OFF button (AC OFF BUTTON ) on the automatic air conditioning pushbutton control module is pressed an LED comes on, the refrigerant compressor is switched off and cooling operation therefore switched off. The air is no longer cooled and dried. All other functions are retained.

The pollutant-triggered recirculating air function is not available in AC OFF mode.

In order to switch the refrigerant compressor off, the automatic air conditioning sends the switch-off request and a specified value = 0 % to the left SAM via the CAN bus. At the same time, the refrigerant compressor torque is set to "0" and transferred to the engine electronics and the electronic transmission control via the electronic ignition lock control module. The left SAM sends the canceled load increase signal to the engine electronics via the electronic ignition lock control module and switches the refrigerant compressor off after a defined time delay (approx. t = 450 ms).

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