Automatic heater pushbutton control module position/function

P83.20-0272-11

1 Temperature selection wheels

2 Blower switch

3 Air distribution switch

4 Recirculated air pushbutton

P83.25-0423-01

Shown on residual engine heat recirculation (Codes 450, 670)

4 Rest pushbutton (is combined with the recirculated air pushbutton)

Function

The control and operating module (N18) is the centerpiece of the automatic heater (HEAT). It permits performance, of adjustments required by the driver, such as:

 Temperature by using the temperature selection wheels (1)

 Air quantity by using the blower switch (2)

 Air distribution by using the air distribution switch (3)

 Recirculated air by pressing the recirculated air pushbutton (4)

 Activation of the residual engine heat recirculation, with ignition turned off, by pressing the Rest button (4) (special request)

Furthermore the control module integrated into the control and operation module (N18) takes over the comparison of specified / actual temperature values and adjustment of the preselected passenger compartment temperature.

The control and operation module (N18) can be diagnosed so that faults arising are stored in a fault memory, which the on board air conditioning system (DMNL Air conditioning 1.5) can be read out.