Pinpoint Test K: The Entire Audio System Is Inoperative

Information and Entertainment System

Pinpoint Test K: The Entire Audio System is Inoperative

Normal Operation

With the ignition in RUN or ACC, the audio system can be powered on. When the ON button is pressed on the Front Controls Interface Module (FCIM) (or the ignition is turned to RUN or ACC and the audio system was on when the ignition was turned off), a wake-up signal is provided to the Front Control/Display Interface Module (FCDIM) via the dedicated Local Interconnect Network (LIN) line. The FCDIM then broadcasts a message over the Infotainment Controller Area Network (I-CAN) to the other modules in the audio system.

When a button is pressed on the FCIM, there is a corresponding display on the FCDIM. The FCDIM displays base audio system information, warning message and icons, SYNC(R) information (if equipped), and satellite radio information (if equipped). The information is sent to the FCDIM via the MS-CAN.

This pinpoint test is intended to diagnose the following:

- Communication network concern
- FCIM
- FCDIM
- ACM

PINPOINT TEST K: THE ENTIRE AUDIO SYSTEM IS INOPERATIVE

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K1 CHECK FOR SCAN TOOL COMMUNICATION

- Carry out the network test with the scan tool.
- Do either the ACM or the FCDIM fail to communicate with the scan tool?

Yes
REFER to Module Communications Network Testing and Inspection to diagnose The ACM Does Not Respond To The Scan Tool or The FCDIM Does Not Respond To The Scan Tool.

No
GO to K2.

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K2 CHECK THE POWER SWITCH INPUT TO THE FCDIM

- Enter the following diagnostic mode on the scan tool: FCDIM DataLogger.
- Monitor the FCDIM power switch PID (BTN_POWER) while pressing and releasing the power switch on the FCIM.
- Does the PID display the correct the power switch positions?

Yes
GO to K3.

No
GO to Pinpoint Test Y. Pinpoint Test Y: The Audio System Does Not Operate Correctly From The Front Controls Interface Module (FCIM)

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K3 CHECK FOR LOST COMMUNICATION DTCs

- Using the scan tool, clear the ACM and FCDIM continuous DTCs.
- Ignition OFF.
- Ignition ON.
- Wait at least 10 seconds.
- Repeat the ACM and FCDIM self-tests.
- Is DTC U0140:00, U0193:00, or U0257:00 present in either module?

Yes
REFER to DTC Charts. [1][2]Diagnostic Trouble Code Descriptions

No
GO to K4.

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K4 CHECK FOR CORRECT ACM OPERATION

- Disconnect all the ACM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the ACM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new ACM. REFER to Audio Control Module (ACM) Audio Control Module (ACM). CLEAR any DTCs present. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR any DTCs present.

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