Pinpoint Test AK: DTC U0155 Or DTC U0155:00
Information and Entertainment System
Pinpoint Tests
Pinpoint Test AK: DTC U0155 Or DTC U0155:00
Normal Operation
The Audio Control Module (ACM) receives network messages from the Instrument Cluster (IC) via the Medium Speed Controller Area Network (MS-CAN). The following information is included in the messages:
- Transmission gear selected
- Vehicle speed
As more than one module (including modules outside of the audio system) 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) Control Panel) - set by the non-navigation Audio Control Module (ACM) when network messages are missing from the IC 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 navigation ACM, the Global Positioning System Module (GPSM), or the Accessory Protocol Interface Module (APIM) when network messages are missing from the IC 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
- IC
PINPOINT TEST AK: DTC U0155 OR DTC U0155:00
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AK1 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 module?
Yes
GO to AK2.
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.
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AK2 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs
- Carry out the self-test for the following modules:
- ACM
- APIM
- BCM-B (if equipped)
- Smart Junction Box (SJB)
- IC
- Is DTC B1317, B1318, U3003:16, or U3003:17 recorded in any module?
Yes
For an audio system module, REFER to DTC Charts. Diagnostic Trouble Code Tests and Associated Procedures
For all other modules, REFER to the Master Diagnostic Trouble Code (DTC) Chart in Body Control Systems. Diagnostic Trouble Code (DTC) Chart
No
GO to AK3.
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AK3 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 module?
Yes
GO to AK4.
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, DISREGARD the DTC.
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AK4 CHECK FOR CORRECT IC OPERATION
- Ignition OFF.
- Disconnect the IC connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IC connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
Yes
INSTALL a new IC. REFER to Instrument Panel, Gauges and Warning Indicators. 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.
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