Pinpoint Test AG: DTC U0155 Or DTC U0155:00
Information and Entertainment System
Pinpoint Test AG: DTC U0155 Or DTC U0155:00
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 Instrument Panel Cluster (IPC) via the Medium Speed Controller Area Network (MS-CAN). The following information is included in the messages:
- English/metric units
- Vehicle Identification Number (VIN)
- Transmission gear selected
- Vehicle speed
As more than one module receives these messages, all modules receiving a particular message should exhibit a symptom if the message is missing.
- DTC U0155 (Lost Communication With Instrument Panel Cluster ( IC)) - set by the non-navigation (Fusion, Milan) Audio Control Module (ACM) or the Front Display Interface Module (FDIM) when network messages are missing from the IPC for greater than 5 seconds with the ignition in RUN.
- DTC U0155:00 (Lost Communication With Instrument Panel Cluster ( IPC) Control Module: No Sub Type Information) - set by the non-navigation (MKZ) or navigation (all) ACM, the audio Digital Signal Processing (DSP) module, the Global Positioning System Module (GPSM), or the Accessory Protocol Interface Module (APIM) when network messages are missing from the IPC 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
- IPC
PINPOINT TEST AG: DTC U0155 OR DTC U0155:00
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AG1 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 U0155 or DTC U0155:00 set in any audio system module?
Yes
GO to AG2.
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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AG2 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)
- FDIM
- GPSM
- IPC
- Is DTC B1317, B1318, U3003:16, or U3003:17 recorded in any module?
Yes
For an audio system module, REFER to DTC Charts. [1][2]Diagnostic Trouble Code Descriptions
For the IPC, REFER to Instrumentation, Message Center, and Warning Chimes Testing and Inspection.
No
GO to AG3.
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AG3 CHECK FOR DTC U0155 OR DTC U0155:00 SET IN MULTIPLE MODULES
- Review the recorded results from the self-test.
- Is DTC U0155 or DTC U0155:00 set in more than one audio system module?
Yes
GO to AG4.
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 wiring between the SJB and the module in question for an intermittent fault.
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AG4 CHECK FOR CORRECT IPC OPERATION
- Disconnect the IPC connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IPC connector and make sure it seats correctly.
- Is the concern still present?
Yes
INSTALL a new IPC. REFER to Instrumentation, Message Center, and Warning Chimes Instrument Panel Cluster (IPC). 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 U0155 or DTC U0155:00.
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