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Pinpoint Test Bx: Abs Module Communication Concern With The All-Wheel Drive (AWD) Control Module

  1. Normal Operation and Fault Conditions 

    With the ignition ON, the AWD control module sends messages to the GWM over the HS-CAN1. The GWM relays the messages to the ABS module over the HS-CAN2. If the ABS module does not receive these messages within the allotted time frame or if the messages contain invalid data, the module sets a DTC. This can be due to a AWD control module failure, a circuit failure on the network or an excessive load on the network. For information on the messages sent to the ABS module by the AWD control module, refer to the Network Message Chart in this article 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 U011D:00 Lost Communication With All Wheel Drive Control Module: No Sub Type Information This DTC sets when the ABS module does not receive any messages from the AWD control module within the allowed time.
    ABS U041E:00 Invalid Data Received From All Wheel Drive Control Module: No Sub Type Information This DTC sets when the ABS module receives messages from the AWD control module, but the messages contain invalid data.

    Possible Causes 

    • Network communication concern
    • AWD control module

  2. BX1 CHECK THE COMMUNICATION NETWORK

    • Ignition ON.

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

    Does the AWD module pass the Network test? 

    Yes  RETRIEVE and RECORD all AWD module DTC. REFER to the appropriate service information . If there are no DTC in the AWD, GO to  BX3
    No  GO to  BX2

  3. BX2 CHECK THE GWM (GATEWAY MODULE A) COMMUNICATION

    • Review the results of the modules communicating on the network from the previous step.

    Does the GWM pass the Network Test? 

    Yes  DIAGNOSE the AWD module does not communicate with the diagnostic scan tool. REFER to COMMUNICATIONS NETWORK
    No  DIAGNOSE the scan tool does not communicate with the GWM. REFER to COMMUNICATIONS NETWORK

  4. BX3 CHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) CMDTCS

    • Clear the ABSDTC

    • Ignition ON.

    • Carry out the ABS self test.

    • Retrieve and record the ABS module DTC s

    Is any DTC listed in the Fault trigger Conditions table retrieved again? 

    Yes  GO to  BX4
    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,

  5. BX4 REVIEW THE RECORDED DTCS FROM THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST

    • Review the recorded DTC s from the ABS module self test.

    Is DTC U3003:16 or U3003:17 recorded? 

    Yes  For DTC U3003:17 GO to Pinpoint Test G  For DTC U3003:16 GO to Pinpoint Test A 
    No  GO to  BX5

  6. BX5 CHECK FOR DTCS IN THE AWD (ALL-WHEEL DRIVE) MODULE

    • Carry out the AWD self-test.

    Are any DTC present in the AWD module? 

    Yes  DIAGNOSE the AWD module DTC. REFER to the appropriate service information
    No  GO to  BX6

  7. BX6 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 AWD module or 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 - reconfigure 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 sapped 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  BX7
    No  The system is operating correctly at this time. the concern may have been due to incorrect part replacement procedures or incorrect module configuration.

  8. BX7 CHECK THE COMMUNICATION DTCS SET IN THE OTHER MODULES

    • Press Read Vehicles Information Button to retrieve DTCs from the vehicle (DTCs may be displayed from previous diagnostic action.).

    • Read vehicle Information.

    Is DTC U011D:XX set in 1 or more modules in addition to the ABS modules? 

    Yes  GO to  BX8
    No  For Electric brake booster::  GO to  BX10
    For Vacuum brake booster::  GO to  BX9
    For all others:: 
    Test is complete and no faults were found.

  9. BX8 CHECK FOR CORRECT AWD (ALL-WHEEL DRIVE) OPERATION

    • Disconnect AWD 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 AWD 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 FSAIf 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 AWD module. REFER to the appropriate service information
    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.

  10. BX9 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION

    • Ignition OFF.

    • Disconnect ABS Module connector.

    • Disconnect AWD 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 AWD module connector. Make sure the connector seats and latches correctly.

    • Connect ABS 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 FSAIf 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 - Vehicles With: Vacuum Brake Booster .
    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.

  11. BX10 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) OPERATION

    • Disconnect AWD 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 AWD 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 modules are a single assembly known as the EBB unit.CHECK OASIS for any service articles: TSB, GSB, SSM or FSAIf 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 module. 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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