Air conditioning (Control system): Description and operation
- Make
- Land Rover
- Model
- Discovery II (UK)
- Section
- Description and operation › Control system
Control system
The control system operates the refrigerant system and the control flaps in the heater assembly to control the temperature and distribution of air in the vehicle interior. It also outputs signals to the fresh/recirculated air servo motor and the blower to control the volume and source of inlet air. The control system consists of: l An Air Temperature Control (ATC) ECU. l A dual pressure switch. l An evaporator temperature sensor. l An in-car temperature sensor. l A sunlight sensor. l A heater coolant temperature sensor. l An ambient temperature sensor.
ATC ECU The ATC ECU is installed in the centre of the fascia, below the radio. An integral control panel on the ATC ECU contains switches for system control inputs and a LCD to provide system status information.
Inputs from sensors and the control panel switches are processed by the ATC ECU, which then outputs the appropriate control signals.
ATC ECU connectors
ATC ECU connector pin details
| Connector/Pin No. | Description | Input/Output |
|---|---|---|
| C0791 | ||
| 1 | Battery power supply | Input |
| 2 | Ignition power supply | Input |
| 3 | Sensor power supply | Output |
| 4 | Earth | - |
| 5 | Display illumination | Input |
| 6 | Not used | - |
| 7 | Not used | - |
| 8 | Sensor earth | - |
| C0792 | ||
| 1 | Night lighting/dimming | Input |
| 2 | Vehicle speed | Input |
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