XC90 AWD L6-3.2L VIN 98 B6324S (2007)
Communications Control Module: Description and Operation
Integrated Audio Module (IAM)
The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output
Diagnostic trouble codes (DTCs)
If the control module detects a fault, a diagnostic trouble code is generated. The control module can store up to 10 trouble codes. A fault that is detected
during the most recent operating cycle is defined as permanent. Other faults that 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
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)
diagnostic software P/N
The integrated audio module (IAM) handles functions for:
Radio reception (AM and FM)
The integrated audio module (IAM) communicates with directly connected components as well as with other control modules and components via the
MOST network, which is a fiber-optic communication network.
The integrated audio module (IAM) is a slave module on the MOST network. The infotainment control module (ICM) is the master module.
The integrated audio module (IAM) is mounted in the center console. It is integrated with the audio unit and they are replaced together.
In order to function in the MOST network, the infotainment control module (ICM) checks that the integrated audio module (IAM) has a correct serial
number. If the number is incorrect, the integrated audio module (IAM) does not work.