Requested air flow rate potentiometer

Wiring diagram

Requested air flow rate potentiometer

This potentiometer is connected to the air ventilation knob and detects the various angular positions, sending a signal to the electronic control unit: there are four possible air flow rates which are set manually (1, 2, 3 e 4), plus an "AUTO" position and "0".

It receives a 5V supply from the control unit and has a controlled earth and gives off a signal corresponding to the position of the knob:

R1-R7=1500 Ohm±1%

Recirculation function switch

Pressing this switch engages the recirculation function which is managed completely manually:

Compressor enablement switch (air refrigeration circuit)

Pressing this switch enables the operation of the compressor (air refrigeration circuit).

Passenger compartment temperature sensor

1. Recirculation function switch
2. Compressor enablement switch
3. Passenger compartment temperature sensor

This is located in the climate control control panel between the recirculation and compressor switches.

It consists of an NTC sensor (R at 25°C = 2.2 kOhm), with an operating range of between +5°C and +45°C. The sensor is "ventilatated", in other words it incorporates a small fan which is always supplied so that the temperature reading is not affected by stagnant air inside the dashboard giving a misleading picture.

These last three components make up a single element which is connected by a single connector.