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Pinpoint Test Ah: Abs (Anti-Lock Brake System) Module Communication Concern With IPMB (Image Processing Module B)

  1. Refer to Module Communications Network for schematic and connector information.

    Normal Operation and Fault Conditions 

    With the ignition ON, the IPMB sends messages to the ABS module over the HS-CAN2. If the ABS module does not receive these messages within the specified time frame, the ABS module sets Diagnostic Trouble Codes (DTCs). This can be due to a IPMB failure, a circuit failure on the CAN or an excessive load on the network. For information on the messages sent to the ABS module by the IPMB, REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    ABS U023B:00 Lost Communication With Image Processing Module B: No Sub Type Information If the ABS module does not receive messages from the IPMB within a pre-determined time frame, this DTC is set.
    ABS U023B:87 Lost Communication With Image Processing Module B: Missing Message If the ABS module does not receive messages from the IPMB within a pre-determined time frame, this DTC is set.

    Possible Causes 

    • Network communication concern
    • IPMB

  2. AH1 CHECK THE COMMUNICATION NETWORK

    • Ignition ON.

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

    Does the IPMB pass the Network Test? 

    Yes  RETRIEVE and RECORD all IPMBDTCs. REFER to: Parking Aid . If there are no DTCs in the IPMB, GO to  AH2.
    No  DIAGNOSE the no communication with the IPMB. REFER to: COMMUNICATIONS NETWORK .

  3. AH2 RECHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) DTCS

    available in the appropriate service information

    • Put the ABS module in sleep mode by performing the following steps:

      • With ALL doors closed, set the ignition from ON to OFF.
      • Disconnect the diagnostic scan tool.
      • Open the door, exit the vehicle and close the door.
      • Wait a minimum of 90 seconds for the ABS module to enter sleep mode.

    • Ignition ON.
    available in the appropriate service information

    • Retrieve and record the ABS module DTCs.

    Do any of the DTCs listed in the DTC Fault Trigger Conditions table return? 

    Yes  GO to  AH3.
    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. AH3 REVIEW THE RECORDED DTCS FROM THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST

    • Review the recorded DTCs from the ABS module self-test.

    Is DTC U3003:16 or U3003:17 recorded? 

    Yes  REFER to the DIAGNOSTIC TROUBLE CODE (DTC) CHART .
    No  GO to  AH4.

  5. AH4 CHECK FOR DTCS IN THE IPMB (IMAGE PROCESSING MODULE B)

    available in the appropriate service information

    Are any DTCs present in the IPMB? 

    Yes  DIAGNOSE the IPMBDTCs. REFER to: Parking Aid .
    No  GO to  AH5.

  6. AH5 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 IPMB or the ABS module. 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  AH6.
    No  The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

  7. AH6 CHECK FOR COMMUNICATION DTCS SET IN OTHER MODULES

    • NOTE: DTCs may be displayed from previous diagnostic actions.available in the appropriate service information

    Is any DTC from the Fault Trigger Conditions Table set in 1 or more modules in addition to the ABS module? 

    Yes  GO to  AH7.
    No  GO to  AH8.

  8. AH7 CHECK FOR CORRECT IPMB (IMAGE PROCESSING MODULE B) OPERATION

    • Ignition OFF.

    • Put the ABS module in sleep mode by performing the following steps:

      • With ALL doors closed, set the ignition from ON to OFF.
      • Disconnect the diagnostic scan tool.
      • Open the door, exit the vehicle and close the door.
      • Wait a minimum of 90 seconds for the ABS module to enter sleep mode.

    • Disconnect IPMB connector.

    • Disconnect ABS-A Module connector.

    • Disconnect ABS-B Module connector.

    • Using a good light source, inspect all disconnected electrical connectors for the following:

      • corrosion - install new connector or terminal and clean the module pins
      • damaged or bent pins - install new terminals or pins
      • pushed-out pins - install new pins as necessary
      • spread terminals - install new terminals as necessary

    • Connect ABS-B Module connector. Make sure the connector seats and latches correctly.

    • Connect ABS-A Module connector. Make sure the connector seats and latches correctly.

    • Disconnect IPMB connector. Make sure the connector seats and latches correctly.

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

    Is the concern still present? 

    Yes  CHECK OASIS for any 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 services articles address this concern, INSTALL a new IPMB. REFER to: Image Processing Module B (IPMB) .
    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.

  9. AH8 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) OPERATION

    • Put the ABS module in sleep mode by performing the following steps:

      • With ALL doors closed, set the ignition from ON to OFF.
      • Disconnect the diagnostic scan tool.
      • Open the door, exit the vehicle and close the door.
      • Wait a minimum of 90 seconds for the ABS module to enter sleep mode.

    • Disconnect ABS-A Module connector.

    • Disconnect ABS-B Module connector.

    • Disconnect IPMB connector.

    • Using a good light source, inspect all disconnected electrical connectors for the following:

      • corrosion - install new connector or terminal and clean the module pins
      • damaged or bent pins - install new terminals or pins
      • pushed-out pins - install new pins as necessary
      • spread terminals - install new terminals as necessary

    • Disconnect IPMB connector. Make sure the connector seats and latches correctly.

    • Connect ABS-B Module connector. Make sure the connector seats and latches correctly.

    • Connect ABS-A Module connector. Make sure the connector seats and latches correctly.

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

    Is the concern still present? 

    Yes  The HCU and ABS module are a single assembly known as the EBB unit.CHECK OASIS for any 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 EBB unit. REFER to: Electric Brake Booster (EBB) .
    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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