Pinpoint Test AT: DTC U0184 Or DTC U0184:00
Information and Entertainment System
Pinpoint Test AT: 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 should exhibit a symptom if the message is missing.
- DTC U0184 (Lost Communication With Radio (ACM (Audio Control Module)))- set by the non-navigation Front Controls Interface Module (FCIM) or the Front Display Interface Module (FDIM) when network messages are missing from the ACM (Audio Control Module) for greater than 5 seconds with the ignition in RUN.
- DTC U0184:00 (Lost Communication With Radio: No Sub Type Information)- set by the navigation FCIM (Front Controls Interface Module), the Accessory Protocol Interface Module (APIM), the audio Digital Signal Processing (DSP) module, or the Rear Entertainment Module (RETM) when network messages are missing from the ACM (Audio Control Module) 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 (Audio Control Module)
PINPOINT TEST AT : DTC U0184 OR DTC U0184:00
AT1 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 AT2.
No
The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
AT2 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs
- Carry out the self-test for the following modules:
- ACM (Audio Control Module)
- APIM (Accessory Protocol Interface Module)
- Audio DSP (Digital Signal Processing) module
- FCIM (Front Controls Interface Module)
- FDIM (Front Display Interface Module)
- RETM (Rear Entertainment Module)
Are any low or high voltage DTCs recorded in any module?
Yes
REFER to DTC Charts. Accessories and Optional Equipment
No
GO to AT3.
AT3 CHECK FOR DTC U0184 OR 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 AT4.
No
If there is an observable symptom, GO to Symptom Chart - General Audio System to diagnose the observed symptom. Symptom Chart - General Audio System
If there is no observable symptom, CHECK the MS-CAN (Medium Speed Controller Area Network) wiring between the ACM (Audio Control Module) and the module in question for an intermittent fault.
AT4 CHECK FOR CORRECT ACM (Audio Control Module) OPERATION
- Ignition OFF.
- Disconnect all the ACM (Audio Control Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the ACM (Audio Control Module) 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 (Audio Control Module). REFER to 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.