Pinpoint Test AY: DTC U0155

Seats

Pinpoint Test AY: DTC U0155

Refer to Wiring Diagram Set 14 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), Module Communications Network for schematic and connector information. Diagrams By Number

Normal Operation

The Driver Seat Module (DSM) and the Instrument Panel Cluster (IPC) communicate using the Medium Speed Controller Area Network (MS-CAN). Messages are exchanged between the modules on the MS-CAN for the purposes of determining what functions are being carried out.

- DTC U0155 (Lost Communication with Instrument Panel Cluster (IC) Control Module) - set by the DSM if ignition status message is present, the DSM supply voltage is greater than 10.5 volts, the ignition must be in the on position for a minimum of 5 seconds and if messages are missing for 15 seconds or longer from the IPC over the MS-CAN.

This pinpoint test is intended to diagnose the following:


- Module communication
- DSM
- IPC


PINPOINT TEST AY: DTC U0155

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AY1 VERIFY CUSTOMER CONCERN

- Ignition ON.
- Verify there is an observable symptom present.
- Is an observable symptom present?

Yes
GO to AY2.

No
The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

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AY2 CHECK THE COMMUNICATION NETWORK

- Enter the following diagnostic mode on the scan tool: Network Test.
- Carry out the network test.
- Does the IPC pass the network test?

Yes
GO to AY3.

No
REFER to Module Communications Network Testing and Inspection.

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AY3 RETRIEVE THE RECORDED DTCs FROM THE SELF-TEST

- Check for recorded DSM DTCs from the self-test.
- Is DTC B1317 or B1318 recorded?

Yes
For DTC B1317, GO to Pinpoint Test AV. Pinpoint Test AV: DTC B1317

For DTC B1318, GO to Pinpoint Test AW. Pinpoint Test AW: DTC B1318

No
GO to AY4.

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AY4 RECHECK THE DSM DTCs

NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during Programmable Module Installation (PMI) or the PMI may not have been carried out.

- Clear the DTCs. Repeat the DSM self-test.
- Is DTC U0155 still present?

Yes
GO to AY5.

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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AY5 CHECK FOR DTC U0155/U0155:00 SET IN OTHER MODULES

- Clear all DTCs.
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Enter the following diagnostic mode on the scan tool: Self-Test.
- Retrieve the continuous memory DTCs from all modules.
- Is DTC U0155/U0155:00 set in other modules?

Yes
INSTALL a new IPC. REFER to Instrumentation, Message Center, and Warning Chimes Instrument Panel Cluster (IPC).

No
INSTALL a new DSM. REFER to Driver Seat Module (DSM) Service and Repair.

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