Diagnostic Functions

Diagnostic functions

General
The climate control module (CCM) has a built-in diagnostic system which continuously monitors internal functions and input and output signals.

Diagnostic trouble codes (DTCs)
Diagnostic trouble codes (DTCs) are stored in the control module if the climate control module (CCM) detects a fault. Each diagnostic trouble code (DTC) has a counter which records the number of operating cycles which have been fault-free since the diagnostic trouble code (DTC) was last stored. A fault which is detected in the present operating cycle is defined as permanent. A fault which is detected in one or more operating cycles (although not the present one) is defined as intermittent.
An operating cycle is the period from when the ignition has been off, then on for at least 10 seconds and finally off for at least 10 seconds.

Reading and erasing diagnostic trouble codes (DTCs)
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.

Reading off input and output signals
Using this function, the status or value of parameters can be read off. The presentation of the status or value can be graphic or digital.
For further information about the different parameters, see: Description of parameters Description Of Parameters

Reading off extended fault-tracing information
This function can be used to read parameters, status identifiers and counters stored at the same time as a diagnostic trouble code (DTC). These are called frozen values.
For further information, see: Description of frozen values Description of Frozen Values, CCM

Programming the climate control module (CCM), customer adaptation
Certain parameters for the climate control module (CCM) can be read off and programmed using this function. The purpose of this programming is to:
- read the programmed parameters before replacing the control module. This is so the same parameters can be entered into the new control module
- adapt the function of the control module to the requirements of the driver (customer adaptation)
- adapt the function of the control module for the equipment levels of the vehicle (passenger compartment ventilation filter, parking heater).

Blower fan run-on, status
Provides the status for activation of the blower fan run-on. The run-on dries the evaporator and prevents bad odors which may otherwise result from residual moisture in the system.
OFF = Run-on inactive
ON = Run-on active (preset)

Setting for air distribution for the floor / defroster residual heat, value
Indicates the setting of the air distribution between the floor and defroster.
10/90 - 90/10% (70/30% preset).

Programming the seat temperature
Enter the setting for the high and low temperature levels for heating the front seat.

Identifying the damper motors
This function is used to identify the damper motor module (DMM) after a replacement. When replacing the damper motor module (DMM), the new unit will have a general identity on the LIN bus. The damper motor module (DMM) must then be run to its limit positions. The number of steps the motor can be run between the limit positions is unique for each damper. This determines the functionality of the new damper motor module (DMM) for the climate control module (CCM).

Calibration of climate control module (CCM)
This function is used to check the components communicating with the climate control module (CCM) via LIN bus 1 and LIN bus 2. A diagnostic trouble code (DTC) between CCM-0070 and CCM-0072 will be stored, depending on the fault, if there is a fault in one of the LIN buses. These diagnostic trouble codes (DTCs) can only be stored for this diagnostic function.