Pinpoint Test AJ: DTC U0184 Or DTC U0184:00
Information and Entertainment System
Pinpoint Test AJ: DTC U0184 Or DTC U0184:00
Refer to Wiring Diagram Set 130 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), Audio System/Navigation for schematic and connector information. Diagrams By Number
Normal Operation
Several audio system modules receive network messages from the Audio Control Module (ACM) via the Medium Speed Controller Area Network (MS-CAN). These messages consist of various audio system related information.
As more than one module receives these messages, all modules receiving a particular message should exhibit a symptom if the message is missing.
- DTC U0184 (Lost Communication With Radio ( ACM)) - set by the Front Controls Interface Module (FCIM) (Fusion, Milan) or the Front Display Interface Module (FDIM) when network messages are missing from the ACM for greater than 5 seconds with the ignition in RUN.
- DTC U0184:00 (Lost Communication With Radio: No Sub Type Information) - set by the audio Digital Signal Processing (DSP) module, the Accessory Protocol Interface Module (APIM), the FCIM (MKZ), and the Global Positioning System Module (GPSM) when network messages are missing from the ACM for greater than 5 seconds with the ignition in RUN.
This pinpoint test is intended to diagnose the following:
- Communication network concern
- Audio system concern
- ACM
PINPOINT TEST AJ: DTC U0184 OR DTC U0184:00
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AJ1 CHECK FOR LOST COMMUNICATION DTCs
- Ignition ON.
- Clear continuous DTCs from all modules.
- Ignition OFF.
- Ignition ON.
- Wait at least 10 seconds.
- Retrieve all continuous DTCs from all modules.
- Is DTC U0184 or DTC U0184:00 set in any audio system module?
Yes
GO to AJ2.
No
The system is operating correctly at this time. The DTC may have been set due to an intermittent fault in the network wiring.
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AJ2 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs
- Carry out the self-test for the following modules:
- ACM
- Audio DSP module (if equipped)
- APIM (if equipped)
- FCIM
- FDIM
- GPSM
- Is DTC B1317, B1318, U3003:16, or U3003:17 recorded in any module?
Yes
REFER to DTC Charts. [1][2]Diagnostic Trouble Code Descriptions
No
GO to AJ3.
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AJ3 CHECK FOR DTC U0184 OR DTC U0184:00 SET IN MULTIPLE MODULES
- Review the recorded results from the self-test.
- Is DTC U0184 or DTC U0184:00 set in more than one audio system module?
Yes
GO to AJ4.
No
If there is an observable symptom, REFER to the appropriate Symptom Chart. Symptom Related Diagnostic Procedures
If there is no observable symptom, CHECK the MS-CAN wiring between the ACM and the module in question for an intermittent fault.
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AJ4 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.
- Is the concern still present?
Yes
INSTALL a new ACM. REFER to Audio Control Module (ACM) - Fusion, Milan Audio Control Module (ACM) or Audio Control Module (ACM) - MKZ Audio Control Module (ACM). CLEAR all continuous 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 all continuous DTCs. REPEAT the self-test for the module(s) that set DTC U0184 or DTC U0184:00.
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