Phone Module (PHM)

Phone Module (PHM)

Diagnostic functions

General
The control module 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 if the control module detects a fault. There are approximately 18 diagnostic trouble codes (DTCs) for standard carphones, approximately 25 for carphones with Volvo On Call. A fault which is detected in the most recent operating cycle is defined as permanent. Other faults which are detected are defined as intermittent.

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
VIDA 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 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.

Reading off the parameter values
Using this function, the status or value of parameters can be read off. The status/value is presented digitally.

Checking the Volvo On Call service
This test can be used to check the status of the reserve battery for Volvo On Call.

Resetting the reserve battery
This service is used when the reserve battery has been replaced to reset the value to 100%. The algorithm of the battery must be reset if the reserve battery in a phone module (PHM) with Volvo On Call is replaced.

Resetting the carphone code
This function is used to reset the carphone code to the original code when it has been changed.