Pinpoint Tests AT: DTC U0257:00

Instrumentation, Message Center and Warning Chimes

Pinpoint Test AT: DTC U0257:00

Normal Operation
- DTC U0257:00 (Lost Communication With Front Controls / Display Interface Module: No Sub Type Information) - sets in continuous memory in the Instrument Panel Cluster (IPC) if data messages received from the Front Control/Display Interface Module (FCDIM) over the High Speed Controller Area Network (HS-CAN) are missing for 5 seconds or more. For a complete list of all network messages, refer to Module Communications Network Testing and Inspection.

This pinpoint test is intended to diagnose the following:

- FCDIM
- IPC

PINPOINT TEST AT: DTC U0257:00

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AT1 VERIFY THE CUSTOMER CONCERN

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

Yes
GO to AT2.

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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AT2 CHECK THE COMMUNICATION NETWORK

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

Yes
GO to AT3.

No
REFER to Module Communications Network Testing and Inspection.

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AT3 RETRIEVE THE RECORDED DTCs FROM THE FCDIM SELF-TEST

- Check for recorded DTCs from the FCDIM self-test.
- Is DTC U3006:16 or DTC U3006:17 recorded?

Yes
REFER to Information and Entertainment Systems Testing and Inspection.

No
GO to AT4.

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AT4 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Check for recorded DTCs from the IPC self-test.
- Is DTC U3006:16 or DTC U3006:17 recorded?

Yes
For DTC U3006:16, GO to Pinpoint Test AU. For DTC U3006:17, GO to Pinpoint Test AV. Pinpoint Tests AU: DTC U3006:16 Pinpoint Tests AV: DTC U3006:17

No
GO to AT5.

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AT5 RECHECK THE IPC DTCs

- Clear the DTCs.
- Wait 10 seconds.
- Repeat the IPC self-test.
- Is DTC U0257:00 still present?

Yes
GO to AT6.

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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AT6 CHECK FOR DTC U0212:87 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 U0257:00 set in the Audio Control Module (ACM)?

Yes
INSTALL a new FCDIM. REFER to Information and Entertainment Systems Front Controls/Display Interface Module (FCDIM). CLEAR the DTCs. REPEAT the self-test.

No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Service and Repair. TEST the system for normal operation.

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