Diagnostics
Diagnostics
The Climate control module diagnostic system continuously diagnoses the function of the system components and stores any diagnostic trouble code (DTCs). The diagnostic trouble codes (DTCs) can then be read off via VIDA. The principles for presentation of information are the same as the cars other on-board diagnostic (OBD) system.
Diagnostic function is carried out automatically by the Climate control module or is activated by VIDA.
The diagnostic function is the same for all climate control systems (ECC/MCC/STD). The functions are the same while the in and output signals are dependent on the type of climate control.
The diagnostic function checks the sensors, stepper motors, blower fan, air conditioning system (ECC, MCC) and wiring.
The diagnostic function can be carried out when the climate control module has supply voltage. The Climate control module has this when the ignition key is in position II and for 50 minutes after the ignition has been switched off. (because of blower fan run on).
The identity of the Climate control module, and the installed software can be read off via the VIDA station.
Diagnostic functions
The following functions can be used via VIDA:
- Reading off stored Diagnostic trouble codes (DTCs).
- Erasing stored Diagnostic trouble codes (DTCs).
- Reading off customer parameters.
- Changing the customer parameters.
- Reading off input and output signals.
Diagnostic trouble codes (DTCs)
There are diagnostic trouble codes (DTCs) for all the climate control system in and output signals. The diagnostic trouble codes (DTCs) are stored by the climate control system diagnostic system if a fault occurs during normal operation. Diagnostic trouble codes (DTCs) are defined in the respective climate control systems.
- There are 27 diagnostic trouble codes (DTCs) for the Electronic climate control (ECC).
- There are 22 diagnostic trouble codes (DTCs) for the Manual climate control (MCC).
- There are 20 diagnostic trouble codes (DTCs) for the Standard climate control (STD).
Substitute value
The climate control system has built in substitute values which are activated automatically by the Climate control module when a fault on a certain component occurs. The Climate control module takes corrective action in case of faults in the following components:
- When there is a fault in the fan the Climate control module switches it off.
- When there is a fault in the evaporator sensor the temperature is set to 0°C (32°F).
- When there is a fault in the temperature sensor in the climate control panel the temperature is set to 22°C (71.6°F).
- When there is a fault in the sun sensor a substitute value is set.
- When there is a fault in the stepper motor it is taken out of function.
The Climate control module guides a return to normal function when the fault is remedied.
Customer adjustment
The parameters for customer adjustments are data that can be adjusted when the customer is not happy with a particular function or when the system is supplemented with an optional component. The parameters are designed around the car equipment and are implemented in the factory.
Note! When installing or replacing the climate control module the parameters must be updated according to the previous setting.
The following parameters can be programmed if adjustment is required:
- Blower fan run on.
- Timed recirculation.
- If the climate control system air intake has a passenger compartment ventilation filter or not.
- Adjusting blower fan speed in relation to the blower fan switch position.
- Adjusting passenger compartment air temperature in relation to temperature controls.
- Adjusting passenger compartment air temperature in relation to temperature sensors signal.
- Adjusting passenger compartment air temperature in relation to sun sensors signal.
- Adjusting the air distribution between the floor and defroster vents.
Note! Other parameters which are dependent on the car equipment are stored in the central electronic module (CEM).