Diagnostic Trouble Code (DTC) Information ICM-6C71

Condition

Fig 1: Identifying Audio Control Module

Courtesy of VOLVO CARS CORPORATION

The serial number for each control module in the infotainment system is stored in the central electronic module (CEM). The stored numbers are compared with the serial numbers of the control modules at start up. If any number does not correspond, that particular control module is blocked and the function is not available. The blocking function for non-approved control modules is designated security on MOST.

The infotainment control module (ICM) checks whether the Audio module (AUD) is in the approved list stored in the central electronic module (CEM).

Diagnostic trouble code (DTC) ICM-6C71 is stored if the Infotainment Control Module (ICM) registers that the Audio module (AUD) is not on the approved list.

Diagnostic trouble code (DTC) ICM-6C71 can be detected when the ignition is on for at least 12 seconds and the battery voltage is > 11 V and security on MOST is activated.

Substitute Value

None.

Possible Source

Replacing an Audio module (AUD) which is not approved in the list stored in the central electronic module (CEM)
Software not downloaded when replacing the Audio module (AUD)
Failed or incomplete software download for the Audio module (AUD).

Fault symptom[s]

No sound from the loudspeakers
The headsets are not functioning.