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Pinpoint Test Ac: U0140:00 Or U0422:00

  1. Normal Operation and Fault Conditions 

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    IPMB U0140:00 Lost Communication With Body Control Module: No Sub Type Information Sets in continuous memory in the IPMB if data messages received from the BCM through the GWM are missing for 5 seconds or longer.
    IPMB U0422:00 Invalid Data Received From Body Control Module: No Sub Type Information Sets in the IPMB when the IPMB received invalid network data from the BCM through the GWM for 5 seconds or longer.

    Possible Sources 

    • Communication concern
    • GWM concern
    • BCM
    • IPMB

  2. AC1 VERIFY THE CUSTOMER CONCERN

    • Ignition ON.

    • Verify there is an observable symptom present.

    Is an observable symptom present? 

    Yes  GO to  AC2
    No  CLEAR the DTC. The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

  3. AC2 CHECK THE COMMUNICATION NETWORK

    • Using a diagnostic scan tool, perform the network test.

    Does the BCM pass the network test? 

    Yes  GO to  AC3
    No  REFER to: Communications Network .

  4. AC3 PERFORM THE IPMB (IMAGE PROCESSING MODULE B) SELF-TEST

    • Using a diagnostic scan tool, perform the IPMB self-test.

    Are any non-network Diagnostic Trouble Codes (DTCs) present? 

    Yes  REFER to Diagnostic Trouble Code (DTC) Chart .
    No  GO to  AC4

  5. AC4 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, check the GWM Continuous Memory Diagnostic Trouble Codes (CMDTCs).

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to: Communications Network .
    No  GO to  AC5

  6. AC5 PERFORM THE BCM (BODY CONTROL MODULE) SELF-TEST

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

    Are any non-network Diagnostic Trouble Codes (DTCs) present? 

    Yes  REFER to: Body Control Module (BCM) .
    No  GO to  AC6

  7. AC6 RECHECK THE IPMB (IMAGE PROCESSING MODULE B) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, clear the IPMB Diagnostic Trouble Codes (DTCs).

    • Ignition OFF.

    • Ignition ON.

    • Wait 10 seconds.

    • Using a diagnostic scan tool, perform the continuous memory self-test.

    • Check the IPMB Diagnostic Trouble Codes (DTCs).

    Is DTC U0140:00 or U0422:00 present? 

    Yes  GO to  AC7
    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.

  8. AC7 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 or IPMB. If recent service history is found:

      • verify correct replacement module was installed

        • vehicle parts build may be used to verify correct part fitment

      • verify the configuration of replacement module was correct

        • re-configure 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

        • if a new replacement module is installed, PERFORM PMI using as-built data

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

    Is the observable symptom still present? 

    Yes  GO to  AC8
    No  The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

  9. AC8 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect the BCM 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 BCM 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 BCM. REFER to: Body Control Module (BCM) .
    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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