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Pinpoint Test S: U0121:87 Or U0415:00

  1. Refer to MODULE COMMUNICATIONS NETWORK for schematic and connector information.

    Normal Operation and Fault Conditions 

    The IPMB communicates with the ABS module on the HS-CAN2.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    IPMB U0121:87 Lost Communication With Anti-Lock Brake System (ABS) Control Module "A": Missing Message Sets in continuous memory in the IPMB if expected messages from the ABS module are not received for 5 seconds or more when the ignition is on.
    IPMB U0415:00 Invalid Data Received from Anti-Lock Brake System (ABS) Control Module "A": No Sub Type Information Sets in the IPMB when the IPMB received invalid network data from the ABS module through the GWM for 5 seconds or longer.

    Possible Sources 

    • Communication network concern
    • ABS Module
    • IPMB

  2. S1 VERIFY THE CUSTOMER CONCERN

    • Ignition ON.

    • Verify whether an observable symptom is present.

    Is an observable symptom present? 

    Yes  GO to  S2
    No  CLEAR the DTC. The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

  3. S2 CHECK THE COMMUNICATION NETWORK

    • Using a diagnostic scan tool, perform the network test

    Does the ABS module pass the network test? 

    Yes  GO to  S3
    No  REFER to: Ethernet Module Communications Network

  4. S3 PERFORM THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST

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

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

    Yes  DIAGNOSE all non-network Diagnostic Trouble Codes (DTCs). REFER to: Anti-Lock Brake System (ABS) and Stability Control
    No  GO to  S4

  5. S4 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  DIAGNOSE all non-network Diagnostic Trouble Codes (DTCs). REFER to the Diagnostic Trouble Code (DTC) Chart .
    No  GO to  S5

  6. S5 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, retrieve the IPMB Continuous Memory Diagnostic Trouble Codes (CM DTCs).

    Is DTC U0121:87 or U0415:00 still present? 

    Yes  GO to  S6
    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.

  7. S6 CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERN

    • CHECK the vehicle service history for recent service actions related to the ABS module 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

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

    Is the observable symptom still present? 

    Yes  GO to  S7
    No  The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

  8. S7 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION

    • Ignition OFF.

    • Disconnect and inspect all ABS module connectors and related in-line 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 ABS module connectors and related in-line 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 ABS module. REFER to: Anti-Lock Brake System (ABS) Module
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
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