Test A: The Entire Audio System Is Inoperative
PINPOINT TEST A: THE ENTIRE AUDIO SYSTEM IS INOPERATIVENormal Operation
With the key in RUN or ACC, the audio system can be powered on. When the ON button is pressed on the front controls interface module (FCIM), a wake-up signal is sent to the audio control module (ACM), the front display interface module (FDIM), the accessory protocol interface module (APIM) (if equipped), and the satellite digital audio receiver system (SDARS) module (if equipped).
When a button is pressed on the FCIM, there is a corresponding display on the FDIM. The FDIM displays both base audio system information, SYNC information (if equipped), and satellite radio information (if equipped). The information is sent to the FDIM via the medium speed controller area network (MS-CAN).
- DTC U0184 (Lost Communication With Radio [ACM]) - set by the FCIM when it does not receive status messages from the ACM for greater than 5 seconds. When the ACM status message is lost, FCIM button functionality is lost, rendering the system completely inoperative.
- DTC U0255 (Lost Communication With Front Controls Interface Module) - set by the ACM when it does not receive status messages from the FCIM for greater than 5 seconds. When the FCIM status message is lost, FCIM button functionality is lost, rendering the system completely inoperative.
This pinpoint test is intended to diagnose the following:
- Communication network concern
- FCIM
- ACM
A1-A3:
A4-A5:
