Rear air conditioning pushbutton control module function - GF83.50-P-2000M

MODEL 220 with CODE (582) rear air conditioning 

Fig 1: Identifying Rear A/C Pushbutton Control Module And Air Distribution Controller

Function 

The rear air conditioning pushbutton control module (N22/3) allows the temperature to be individually adjusted for passengers in the rear:

• The blow-out temperature in the rear is controlled by pressing the left and right temperature buttons ( )
• Manual/automatic air quantity by pressing the blower button ( )
• Manual air distribution duct from the rear nozzle between the front seats or the rear footwell nozzle by adjusting the air distribution regulator (1)
• Activating the residual engine heat utilization system with the ignition switched off by pressing the REST button ( )
• Switch ON/OFFby pressing the ON/OFF button ( )

The control module integrated in the rear air conditioning pushbutton control module (N22/3) still directly regulates the following components: 

• Rear duo valves
• Rear heating water circulation pump
• Rear blower regulator
• Rear air distribution valve actuator motor
• Refrigerant shut-off valve

The following sensor signals are directly read in by the rear air conditioning pushbutton control module (N22/3) 

• Left and right rear heat exchanger temperature sensor
• Evaporator temperature sensor

Communication between the automatic air conditioning pushbutton control module and the rear air conditioning pushbutton control module. 

• Temperature control:  The automatic air conditioning pushbutton control module reads in all the rear air conditioning pushbutton control module set points and internally calculates the required blow-in temperatures for the entire interior. The values calculated for the rear left and right are sent to the rear air conditioning pushbutton control module, which regulates the blow-in temperatures itself.

  If the rear seats are unoccupied (detected via buckle), the temperature control is automatically set to 22 °C.

  As of 01.06.01  the temperature control will be taken over from the automatic air conditioning pushbutton control module if the rear seats are unoccupied.

• Blower control:  If the rear air conditioning pushbutton control module is in automatic blower mode, the front blower level is taken over.

  As of 01.06.01  the blower control in automatic blower mode will be directly controlled by the rear air conditioning pushbutton control module.

• Remote control of rear air conditioning pushbutton control module by automatic air conditioning pushbutton control module:  If the blower button on the automatic air conditioning pushbutton control module is held down in the AUTO position for approx. 1 second, a control module symbol appears in the front display together with the rear air conditioning settings. These settings can then be modified from the front. The rear air conditioning can also be switched off using the ON/OFF button ( ). The function is automatically exited if no adjustments are made for 3 seconds.