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Pinpoint Test Q: Network Communication Concerns U0140:00, U0146:00, U0155:00, U023A:00 Or U0241:00

  1. Normal Operation and Fault Conditions 

    REFER to: Steering Wheel and Column Electrical Components - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    SCCM U0140:00 Lost Communication With Body Control Module: No Sub Type Information
    NOTE: This DTC sets in a module that is reporting a missing or invalid message from another module on the data bus. The module that reports the fault is not the problem module. Do not install a new SCCM as part of the repair unless directed to do so in a pinpoint test. This DTC sets when the SCCM detects a missing or invalid message from the BCM
    SCCM U0146:00 Lost Communication With Serial Data Gateway "A": No Sub Type Information
    NOTE: This DTC sets in a module that is reporting a missing or invalid message from another module on the data bus. The module that reports the fault is not the problem module. Do not install a new SCCM as part of the repair unless directed to do so in a pinpoint test. This DTC sets when the SCCM detects a missing or invalid message from the GWM
    SCCM U0155:00 Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub Type Information
    NOTE: This DTC sets in a module that is reporting a missing or invalid message from another module on the data bus. The module that reports the fault is not the problem module. Do not install a new SCCM as part of the repair unless directed to do so in a pinpoint test. This DTC sets when the SCCM detects a missing or invalid message from the IPC
    SCCM U023A:00 Lost Communication With Image Processing Module A: No Sub Type Information
    NOTE: This DTC sets in a module that is reporting a missing or invalid message from another module on the data bus. The module that reports the fault is not the problem module. Do not install a new SCCM as part of the repair unless directed to do so in a pinpoint test. This DTC sets when the SCCM detects a missing or invalid message from the IPMA

    Possible Sources 

    • Network communication concern
    • SCCM concern
    • BCM
    • GWM
    • IPC
    • IPMA
    • HCM

  2. Q1 U0140:00, U0146:00, U0155:00, OR U023A:00

    • Ignition OFF.

    • Using a diagnostic scan tool, carry out the Network Test.

    Does the BCM, GWM, IPMA,, IPC or the SCCM pass the Network Test? 

    Yes  GO to  Q2
    No  DIAGNOSE theBCM, GWM, IPC, IPMA or SCCM does not respond to the diagnostic scan tool. REFER to: Communications Network

  3. Q2 CHECK THE SCCM (STEERING COLUMN CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, carry out the SCCM self-test.

    • Clear the Diagnostic Trouble Codes (DTCs).

    • Ignition OFF.

    • Ignition ON.

    • Using a diagnostic scan tool, carry out the SCCM self-test.

    • Record the SCCM Diagnostic Trouble Codes (DTCs).

    Are DTC U0140:00, U0146:00, U0155:00, U023A:00 or U0241:00 retrieved again? 

    Yes  GO to  Q3
    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.

  4. Q3 REVIEW THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE SCCM (STEERING COLUMN CONTROL MODULE) SELF-TEST

    • Check the recorded Diagnostic Trouble Codes (DTCs) from the SCCM self-test.

    Are any non network DTCs present in the SCCM? 

    Yes  DIAGNOSE all non network Diagnostic Trouble Codes (DTCs) first. REFER to the appropriate DTC chart.
    No  GO to  Q4

  5. Q4 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) IN THE GWM (GATEWAY MODULE A)

    • Using a diagnostic scan tool, carry out the GWM self-test.

    Are any Diagnostic Trouble Codes (DTCs) present in the GWM? 

    Yes  DIAGNOSE the GWM Diagnostic Trouble Codes (DTCs). REFER to: Communications Network
    No  For U0140:00 GO to  Q5 For U0146:00 GO to  Q6 For U0155:00 GO to  Q7 For U0234:00 GO to  Q8

  6. Q5 U0140:00 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) IN THE BCM (BODY CONTROL MODULE)

    • Using a diagnostic scan tool, carry out the BCM self-test.

    Are any Diagnostic Trouble Codes (DTCs) present in the BCM? 

    Yes  DIAGNOSE the BCM Diagnostic Trouble Codes (DTCs). REFER to: Body Control Module (BCM)
    No  GO to  Q9

  7. Q6 U0146:00 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) IN THE GWM (GATEWAY MODULE A)

    • Using a diagnostic scan tool, carry out the GWM self-test.

    Are any Diagnostic Trouble Codes (DTCs) present in the GWM? 

    Yes  DIAGNOSE the GWM Diagnostic Trouble Codes (DTCs). REFER to: Communications Network
    No  GO to  Q9

  8. Q7 U0155:00 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) IN THE IPC (INSTRUMENT PANEL CLUSTER)

    • Using a diagnostic scan tool, carry out the IPC self-test.

    Are any Diagnostic Trouble Codes (DTCs) present in the IPC? 

    Yes  DIAGNOSE the IPC Diagnostic Trouble Codes (DTCs). REFER to: INSTRUMENTATION, MESSAGE CENTER AND WARNING CHIMES .
    No  GO to  Q9

  9. Q8 U023A:00 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) IN THE IPMA (IMAGE PROCESSING MODULE A)

    • Using a diagnostic scan tool, carry out the IPMA self-test.

    Are any Diagnostic Trouble Codes (DTCs) present in the IPMA? 

    Yes  DIAGNOSE the IPMA Diagnostic Trouble Codes (DTCs). REFER to: Lane Keeping System
    No  GO to  Q9

  10. Q9 CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERN

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

    • Check the vehicle service history for recent service actions related to the BCM, GWM, IPC, IPMA or SCCM. If recent service history is found:

      • verify the correct replacement module was installed.

        • HVBOM may be used to verify correct part fitment.

      • verify the configuration of replacement module was correct.

        • re-configure the module using as-built data if prior configuration is suspect.

      • verify the module was not obtained from a like vehicle and installed into customer vehicle.

        • return the swapped module to source vehicle and obtain new replacement module.

    • Operate the system and determine if the observable symptom is still present.

    Is the observable symptom still present? 

    Yes  GO to  Q10
    No  The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

  11. Q10 CHECK FOR CORRECT SUSPECT MODULE OPERATION

    • Ignition OFF.

    • Disconnect and inspect all suspect module connectors.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary

    • Reconnect the Suspect Module connectors and all other previously disconnected connectors. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new Suspect Module. For U0140:00 INSTALL a new BCM. REFER to: Body Control Module (BCM) . For U0146:00 INSTALL a new GWM. REFER to: Gateway Module A (GWM) . For U0155:00 INSTALL a new IPC. REFER to: Instrument Panel Cluster (IPC) . For U023A:00 INSTALL a new IPMA. REFER to: Image Processing Module A (IPMA)
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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