184000350 - INTRODUCTION - CLIMATE CONTROL - MISCELLANEOUS
INTRODUCTION
This vehicle is equipped with two passenger compartment climate control systems:
- manual climate control
- dual zone climate control system
The difference between both system types, i.e. manual and automatic, lies solely in the way the system is managed:
- manual climate control: the user adjusts certain air temperature, distribution and flow settings. These remain the same until they are re-adjusted by the user
- automatic climate control system: the user can set parameters and instruct the system to manage them automatically. The user retains the ability to manage the system, if required.
MANUALLY OPERATED CLIMATE CONTROL
The figure below depicts the manual climate control system
Operating strategy
The manual air condition allows the user to manage passenger compartment air temperature and intake by mean of the control wheels and knobs.The following parameters/functions can be modified manually:
- Temperature
- Distribution pattern to 5 settings
- Fan speed.
- Compressor enabled
- Demist/defrost function.
- Recirculation.
AUTOMATIC CLIMATE CONTROL
This system may be managed automatically by an electronic control unit known as the ''Climate Control System Node'' (NCL) that is responsible for maintaining climate control system settings entered by the user (or users) unchanged.The NCL is connected to the B-CAN network of the vehicle electrical system.The NCL is built into the climate control system panel installed in the middle of the instrument facia.The following figure depicts the back of the control unit showing connections to the electrical system and then the connector pin out.
| PIN | OPERATION |
|---|---|
| 01 | CAN L line |
| 02 | CAN H line |
| 03 | N.C. |
| 04 | Heated rear windscreen operation |
| 05 | Fan control |
| 06 | N.C. |
| 07 | Solar radiation sensor supply |
| 08 | Frost sensor |
| 09 | Right VENT treated air temperature sensor |
| 10 | Left solar radiation sensor |
| 11. | Analogue earth |
| 12. | Open recirculation control |
| 13 | Heated rear window led |
| 14 | Hazard warning light led |
| 15 | Hazard warning light control |
| 16 | Misting sensor |
| 17 | Left FLOOR treated air temperature sensor |
| 18 | Left VENT treated air temperature sensor |
| 19 | Right solar radiation sensor |
| 20 | Right FLOOR reated air temperature esnsor |
| 21 | Compressor control |
| 22 | Closed recirculation control |
| 23 | N.C. |
| 24 | Right mixer actuator shared |
| 25 | Left mixer actuator feedback |
| 26 | Right mixer actuator feedback |
| 27 | Right distribution actuator feedback |
| 28 | Left distribution actuator feedback |
| 29 | Fan feedback |
| 30 | Battery power supply |
| 31 | External 5v supply |
| 32 | Left mixer actuator control |
| 33 | Right distribution actuator shared |
| 34 | Right distribution actuator control |
| 35 | Right mixer actuator control |
| 36 | Left distribution actuator control |
| 37 | Left mixer actuator shared |
| 38 | Left distribution actuator shared |
| 39 | Signal + key |
| 40 | Electronic earth |
 | If the control unit or one of the actuators are replaced, the flap positions must be initialised using an Examiner. |
Operating strategy
The following figure depicts the front of the control panel:
The management control unit is capable of producing and maintaining the desired comfort in two areas of the passenger compartment by controlling the following parameters and functions:
- Air temperature at the driver/passenger vents;
- Speed of the fan (varies continuously);
- Air distribution;
- Compressor engagement;
- Recirculation;
The following parameters/functions can be modified manually:
- Driver/passenger side temperature
- Fan speed.
- Distribution pattern via 5 positions (driver/passenger side)
- Compressor.
- Demist/defrost function.
- Recirculation.
Operating status display
Climate control system operating status is shown through LEDS and DISPLAYS.
- RECIRCULATION function: key with car outline and amber led indicates recirculation function on when lit A symbol on the display also showing the car and an arrow indicating recirculation status;
- Compresor Enablement Function led: key with snowflake symbol and amber led and logo on display indicating Compressor status.
- AUTO/FULL AUTO ( messages on driver and passenger side displays): indicate that all functions are managed, zone by zone, by the control system. The FULL icon goes out if there is at least one manual Flow rate, Distribution, Compressor or Recirculation command. The FULL AUTO icon (or the AUTO icon if FULL is already off) goes out if the system is not capable, due to specific manual operations, of guaranteeing the required temperature for the zone being reached/maintained.
- MAX DEF function LED: key with amber led, indicates MAX DEF function on, when lit.
- HEATED REAR WINDOW LED: YELLOW, indicates heated rear window on.
- Function led OFF: key with OFF wording and amber colour, indicates control off status when lit.
- Distribution status led: amber, indicates passenger compartment air distribution status.
- DISPLAY: NEGATIVE TRANSFLECTIVE type displays passenger compartment fan air flow, temperature settings in both passenger compartment zones (E1 and E2) by means of bars, compressor status (I), recirculation status (F), AUTO system management mode, FULL AUTO (A1, A2).
Comes on after car stops.
When the system is switched on the various parameters are checked manually or automatically depending on the selections made by the user before it was switched off.All the manual interventions made before the engine was switched off are stored in the memory until the next time the engine is started up.This also applies to the OFF function; if the system was OFF before shut-down, the system will again be OFF upon start-up.If at the previous key off the Max Def function was on, then at the key on the condition memorized before the Max Def condition is implemented.Temperature control
Selecting a temperature settingThe passenger compartment temperature is set by the control unit each time the battery is connected at 22 °C. The user can modify the temperature setting by means of the appropriate keys.Changes take place in 0.5 ºC stepsThe temperature adjustment range is between 16 and 32 ºC; below 16. °C the value set becomes ''LO'' whilst above 32. °C the value set becomes ''HI'',When the control unit is switched off, the temperature setting, shown on the display, is stored in the memory and renewed at the next key on.Winter starting transitionIn order not to create problems that could disturb the user, such as cold air jets and/or front window misting, the system must activate a ''TRANSITORY START-UP PERIOD'' management procedure when the control unit is activated under certain temperature conditions.The control unit ensures that the following conditions occur simultaneously:
- engine coolant temperature below -4° C
- outside temperature below 19° C
When these conditions persist, the control unit implements the ''winter starting transitory'' procedure and sets:
- air flow rate to the first bar
- distribution to DEF
- mixing to AUTO conditions
This user request involves the following actions:
- Mixer: the air mixer flap is controlled in FULL COLD position
- Distribution: the distribution flap is positioned (by default) on VENT and the led comes on (visible to the user)
- Ventilation: the air flow is displayed as 12 bars
- Recirculation: remains as set by the user with all the set recirculation rules
- Compressor: enabled (led on if previously off).
Max cooling status management function is interrupted by one of the following functions that is given priority over max cooling management (LO)
- +KEY OFF status management function;
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