Pinpoint Test AH: DTC U0155 Or DTC U0155:00
Information and Entertainment System
Pinpoint Tests
Pinpoint Test AH: DTC U0155 Or DTC U0155:00
Refer to Wiring Diagram Set 130 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Audio System/Navigation for schematic and connector information. Diagrams By Number
Normal Operation
The Global Positioning System Module (GPSM) receives network messages from the Instrument Cluster (IC) via the Medium Speed Controller Area Network (MS-CAN).
- DTC U0155 (Lost Communication With Instrument Panel Cluster ( IC) Module) - set by the non-navigation Audio Control Module (ACM) when the messages are missing from the IC for greater than 5 seconds. When the signal is lost, the ACM turns the speed sensitive volume feature off.
- DTC U0155:00 (Lost Communication With Instrument Panel Cluster (IC) Control Module) - set by the ACM, GPSM and APIM when the messages are missing from the IC for greater than 5 seconds. When the signal is lost, the ACM turns the speed sensitive volume feature off.
This pinpoint test is intended to diagnose the following:
- Communication network concern
- Audio system concern
- IC
PINPOINT TEST AH: DTC U0155 OR DTC U0155:00
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AH1 CHECK FOR LOST COMMUNICATION DTCs
- Ignition ON.
- Clear continuous DTCs from module.
- 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 modules?
Yes
GO to AH2.
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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AH2 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs
- Carry out the self-test for the following modules.
- ACM
- APIM
- FDIM
- GPSM
- IC
- Are any low or high voltage DTCs recorded in any module?
Yes
For an audio system module, REFER to the DTC Charts. Diagnostic Trouble Code Tests and Associated Procedures
For the IC, REFER to Instrumentation, Message Center, and Warning Chimes Testing and Inspection.
No
GO to AH3.
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AH3 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 AH4.
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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AH4 CHECK FOR CORRECT IC OPERATION
- Disconnect the IC connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IC connector and make sure it seats correctly.
- Is the concern still present?
Yes
INSTALL a new IC. REFER to Instrumentation, Message Center, and Warning Chimes Instrument Cluster (IC). 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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