Pinpoint Test A: The Entire Audio System is Inoperative
Information and Entertainment System
Pinpoint Tests
Pinpoint Test A: The Entire Audio System is Inoperative
Normal 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), and the Accessory Protocol Interface Module (APIM) (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. The information is sent to the FDIM via the Medium Speed Controller Area Network (MS-CAN).
This pinpoint test is intended to diagnose the following:
- Communication network concern
- FCIM
- ACM
PINPOINT TEST A: THE ENTIRE AUDIO SYSTEM IS INOPERATIVE
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A1 CHECK FOR SCAN TOOL COMMUNICATION
- Carry out the network test with the scan tool.
- Do either the ACM or the FCIM 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 FCIM Does Not Respond To The Scan Tool.
No
GO to A2.
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A2 CHECK FOR LOST COMMUNICATION DTCs
- Using the scan tool, clear the ACM and FCIM continuous DTCs.
- Ignition OFF.
- Ignition ON.
- Wait at least 10 seconds.
- Repeat the ACM and FCIM self-tests.
- Is DTC U0140, U0184, or U0255 present in either module?
Yes
REFER to DTC Charts. [1][2]Diagnostic Trouble Code Descriptions
No
GO to A3.
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A3 CARRY OUT THE SPEAKER WALK TEST
- Enter the following diagnostic mode on the scan tool: Speaker Walk Test.
- Is the speaker walk test successful?
Yes
GO to A4.
No
GO to A5.
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A4 CHECK FOR CORRECT FCIM OPERATION
- Disconnect the FCIM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the FCIM connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new FCIM. REFER to Front Controls Interface Module (FCIM) Front Controls Interface Module (FCIM). CLEAR any ACM DTCs. TEST the system for normal operation. If the concern is still present, GO to A5.
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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A5 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 FCIM DTCs. 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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