Pinpoint Test AD: DTC U0184 Or DTC U0184:00
Information and Entertainment System
Pinpoint Tests
Pinpoint Test AD: DTC U0184 Or DTC U0184:00
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 mainly of audio setting information.
As more than one module receives each of these messages, all modules receiving a particular message can exhibit a symptom if the message is missing.
- DTC U0184 (Lost Communication With Radio ( ACM)) - set by the Front Controls Interface Module (FCIM) 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 Accessory Protocol Interface Module (APIM) 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 AD: DTC U0184 OR DTC U0184:00
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AD1 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 AD2.
No
The system is operating correctly at this time. The DTC may have been set due an intermittent fault in the network wiring.
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AD2 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs
- Carry out the self-test for the following modules:
- ACM
- FCIM
- FDIM
- APIM (if equipped)
- Are any low or high voltage DTCs recorded in any module?
Yes
REFER to DTC Charts. [1][2]Diagnostic Trouble Code Descriptions
No
GO to AD3.
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AD3 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 AD4.
No
If there is an observable symptom, GO to Symptom Chart - General Audio System to diagnose the observed symptom. Symptom Chart - Audio System
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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AD4 CHECK FOR CORRECT ACM OPERATION
- Ignition OFF.
- 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 determine if 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 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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