Design

Design

Parking heater




The start time of the heater is programmed by the driver selecting the desired function using the stalk on the steering wheel module (SWM) and the driver information module (DIM). The driver information module (DIM) transmits the information on to the central electronic module (CEM).
Approximately 50 minutes before the desired departure time, the central electronic module (CEM) transmits information to the combustion preheater module (CPM) about:
- outside temperature
- quantity of fuel
- the operating status of the vehicle
- a request to calculate the start time of the heater.
The combustion preheater module (CPM) calculates the start time, based on information from the central electronic module (CEM), and starts the heater at the calculated time.
The climate control module (CCM) is activated when the engine coolant temperature (ECT) is greater than +30 °C. The blower fan starts and distributes the air in the passenger compartment.
When the heater is started directly using the control stalk, it runs until it is shut off or for a maximum of 60 minutes. The heater fan remains activated for 10 minutes after the set time to allow for the driver getting to the car late.
When the heater is activated, the information lamp in the driver information module (DIM) lights. The lamp goes out when the heater is deactivated. If the heater is activated and the driver locks the vehicle, the information lamp will go out approximately 25 seconds after the vehicle is locked. If the heater or the timer are activated and ignition is switched on, a text message will be displayed in the driver information module (DIM).
Certain conditions must be met before the heater can start. These are:
- outside temperature below +25nbsp;°C (at 25 °C the heater switches off)
- quantity of fuel more than 4.5 liters for the parking heater and 7.5 liters for the engine coolant heater
- no diagnostic trouble code (DTC) preventing the heater from starting are stored in the control module
- an airbag has not deployed.
When the conditions are met, the heater glow plug is activated for 1 minute.
A diagnostic trouble code (DTC) is stored in the combustion preheater module (CPM) if the heater makes two failed start attempts. The combustion preheater module (CPM) will not attempt to start the heater again until the next operating cycle. A diagnostic trouble code (DTC) is stored in the combustion preheater module (CPM) after ten operating cycles with failed start attempts. The heater cannot then be started until the diagnostic trouble code (DTC) has been erased.
If the combustion preheater module (CPM) registers too low battery voltage or too low fuel level, the heater will be deactivated and a warning message displayed in the driver information module (DIM).

Engine coolant heater (diesel engines only)





Control of the engine coolant heater on cars with standard (STD) and manual climate control (MCC)
The climate control module (CCM) requests that the heater is started.
Certain conditions must be met before the heater can start. These are:
- outside temperature below +5 °C (at 8 °C the heater switches off)
- engine speed (RPM) greater than 500 rpm
- quantity of fuel more than 7.5 liters for the engine coolant heater and 4.5 liters for the parking heater
- no diagnostic trouble code (DTC) preventing the heater from starting are stored in the control module
- an airbag has not deployed.
When the conditions are met, the heater glow plug is activated for 1 minute.
A diagnostic trouble code (DTC) is stored in the combustion preheater module (CPM) if the heater makes two failed start attempts. The combustion preheater module (CPM) will not attempt to start the heater again until the next operating cycle. A diagnostic trouble code (DTC) is stored in the combustion preheater module (CPM) after ten operating cycles with failed start attempts. The heater cannot then be started until the diagnostic trouble code (DTC) has been erased.
When the heater is activated the information lamp lights and a message is displayed in the driver information module (DIM).

Control of the engine coolant heater on vehicles with electronic climate control (ECC)
In cars with electronic climate control (ECC) the engine coolant heater is activated when required. In addition to the above conditions, the climate control module (CCM) also takes the outside temperature, engine coolant temperature (ECT) and the temperature selected into account before a request for the heater to start is made.