Rotary Controls And Switches

Rotary controls and switches





Rotary controls
Left rotary control is used to control fan speed. The following alternatives are available:
- AUTO-function
- Off (ECC is turned off)
- Five different fan speeds (in these positions the automatic setting is disabled).
In AUTO, ECC will select the best fan speed to reach the desired temperature. The fan speed is variable and has 100 steps. The different speeds are controlled electronically.
If AUTO has been selected, fan speed is dependent on:
- set temperature
- current temperature
- car's speed
- coolant temperature.
The rotary control in the middle is used for air distribution. In AUTO, ECC selects the most effective air distribution to reach set temperature as fast as possible. If DEFROST is selected the AC is always turned on automatically and the fan starts with the highest speed. This rotary control can be turned 360°. Servo motors act on the dampers that are responsible for air distribution. These servo motors are connected directly to the ECC control module, which can read off their respective positions via feedback potentiometers. The damper RECIRC does not send back information since it is only open or closed.
Right rotary control is used to set desired passenger compartment temperature in °C (°F). To reach this temperature the AC button has to be set to Auto and the fan must be set to at least position 1 or AUT. If the red or blue marking is selected (highest or lowest temperature), the fan motor will start at the highest speed.

Switches
The recirculation button controls the recirculation dampers. They can be opened or closed, there are no intermediate positions. The dampers can also be controlled by the ECC control module.
The electrically heated rear window can be turned on together with heating of the outside mirrors using the button in the middle.
Position AUTO; ECC control module controls AC by sending a request to Engine control module (ECM) depending on different conditions. The AC compressor is controlled by Engine control module (ECM).
Position OFF; AC is off, but will be turned on if DEFROST is selected.

Note! The passenger compartment's temperature sensor is located behind the left ventilation grill. As long as the fan is on air will flow through this grill to ensure the sensor's function.Do not place decals, etc. over this grill. Then the ECC cannot control the temperature!