Diagnostic Functions

Diagnostic functions

General
The Convertible Roof Module (CRM) has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.

Diagnostic trouble codes (DTCs)
A diagnostic trouble code (DTC) is stored in the control module if the Convertible Roof Module (CRM) detects a fault. Every diagnostic trouble code (DTC) has a counter which records the number of cycles which have been "fault-free" since the diagnostic trouble code (DTC) was stored. A fault which is detected in each 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 extended diagnostic trouble code (DTC) 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.

Reading the control module identification
The control module can be identified by means of reading off a number of codes.
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 the parameter values
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 on the different parameters, see Vehicle communication information under Specifications, other.

Calibration of position sensor
Use this option to calibrate the Convertible Roof Module (CRM) to the position of the position sensors. So that the roof sections do not collide during operation, this option must be run after:
- downloading software to the Convertible Roof Module (CRM)
- replacing the position sensors
- replacing the entire roof
- replacing the Convertible Roof Module (CRM).