Pinpoint Test E: DTC U0257:00
Body Control Module (BCM)
Pinpoint Test E: DTC U0257:00
Normal Operation
- DTC U0257:00 (Lost Communication With Front Controls/Display Interface Module: No Sub Type Information) - sets in the Body Control Module (BCM) if data messages received from the Front Control/Display Interface Module (FCDIM) are missing. 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:
- Communication network concern
- FCDIM
- BCM
PINPOINT TEST E: DTC U0257:00
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E1 VERIFY THE CUSTOMER CONCERN
- Ignition ON.
- Verify that there is an observable symptom present.
- Is an observable symptom present?
Yes
GO to E2.
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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E2 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 E3.
No
REFER to Module Communications Network Testing and Inspection, The Front Control/Display Interface Module (FCDIM) Does Not Respond To The Scan Tool.
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E3 RETRIEVE THE RECORDED DTCs FROM THE BCM SELF-TEST
- Check for recorded BCM DTCs from the self-test.
- Is DTC U3003:16 or DTC U3003:17 recorded?
Yes
For DTC U3003:16, GO to Pinpoint Test F. For DTC U3003:17, GO to Pinpoint Test G. Pinpoint Test F: DTC U3003:16 Pinpoint Test G: DTC U3003:17
No
GO to E4.
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E4 CHECK FOR DTCs U3006:16 AND U3006:17 FROM THE FCDIM SELF-TEST
- Retrieve the continuous memory DTCs from the FCDIM.
- Is DTC U3006:16 or DTC U3006:17 recorded?
Yes
REFER to Information and Entertainment Systems Testing and Inspection.
No
GO to E5.
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E5 RECHECK THE BCM 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 BCM self-test.
- Is DTC U0257:00 still present?
Yes
GO to E6.
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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E6 CHECK FOR DTC U0257:00 OR U0257 SET IN OTHER MODULES
- Clear the 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 or DTC U0257 set in any other module?
Yes
INSTALL a new FCDIM. REFER to Information and Entertainment Systems Front Controls/Display Interface Module (FCDIM). CLEAR the DTCs. REPEAT the BCM self-test.
No
INSTALL a new BCM. REFER to Body Control Module (BCM) Body Control Module (BCM). TEST the system for normal operation.
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