Diagnostic Functions

Diagnostic functions

General
The climate control module (CCM) has a built-in diagnostic system, the Volvo on-board diagnostic (OBD) system, which continuously monitors itself and the 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. Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.

Reading off the control module identification
The diagnostic tool identifies control modules by reading off a number of codes from the control module memory.
The codes contain information about the control module:
- hardware P/N (control module without software)
- hardware serial number (control module without software)
- software P/N
- diagnostic software P/N

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 more information, see Vehicle communication information in Specifications, other.

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 more information, see Vehicle communication information in Specifications, other.

Description of programmable parameters, 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 for the equipment levels of the vehicle (passenger compartment ventilation filter, parking heater).
- adapt the function of the control module to the requirements of the driver (customer adaptation).

Programmable parameters depend on vehicle model and selected options:
- seat heating, adjusting the different levels
- seat ventilation, adjusting the different levels
- the time that seat heating shall be on after it has been activated.
Setting the seat temperature, value
Enter the setting for the high and low temperature levels for heating the front seat.

Identifying components on the LIN network - Climate control module (CCM)
This function is used to identify components on the LIN network, for example after replacement of a Damper motor module (DMM). 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).

Checking the LIN bus
This function is used to check the components communicating with the climate control module (CCM) via LIN bus 1 and LIN bus 2. A number of diagnostic trouble codes (DTCs) will be stored, depending on the fault, if there is a fault in one of the LIN buses. The LIN buses must be calibrated after downloading new software and after replacing the climate control module (CCM).