Pinpoint Test 8: The Audio System Does Not Operate Correctly From The Front Controls Interface Module (FCIM)
PINPOINT TEST 8: THE AUDIO SYSTEM DOES NOT OPERATE CORRECTLY FROM THE FRONT CONTROLS INTERFACE MODULE (FCIM)
Normal Operation
When a button is pressed on the front controls interface module (FCIM), a signal is sent over the medium speed controller area network (MS-CAN) to the modules in the audio system.If the FCIM can no longer communicate on the MS-CAN (due to loss of power, ground, etc.), the audio system remains in the operating state it was in prior to the failure. The steering wheel controls (if equipped) continue to operate.
- DTC B2924 (Audio Button Stock) - set by the FCIM if a button is detected as active for greater than 3 seconds during the self-test, or for greater than 2 minutes during normal operation. When this occurs, the FCIM disables the button until it detects the button as no longer active.
- DTC U0184 (Lost Communication With Radio [ACM]) - set by the FCIM when it is missing status messages from the audio control module (ACM) for greater than 5 seconds with the ignition in the RUN position. If the status message is missing, the FCIM controls may be inoperative for controlling audio system functions.
- DTC U0255 (Lost Communication With Front Controls Interface Module) - set by the ACM if it is missing status messages from the FCIM for greater than 5 seconds with the ignition in the RUN position. If the status message is missing, the controls on the FCIM do not operate, as the signal never gets to the designated module.
Possible Causes
- Communication network concern
- FCIM
Diagnostic Procedure
CAUTION:Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
