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Pinpoint Test BR: Abs Module Communication Concern With VDM

  1. Normal Operation and Fault Conditions 

    With the ignition ON, the VDM sends messages to the ABS module over the FD-CAN. 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 VDM 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 VDM, 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 U0122:00 Lost Communication With Vehicle Dynamics Control Module: No Sub Type Information This DTC sets when the ABS module does not receive any messages from the VDM within the allowed time.

    Possible Causes 

    • Network communication concern
    • VDM

  2. BR1 CHECK THE VDM (VEHICLE DYNAMICS CONTROL MODULE) COMMUNICATION NETWORK

    • Ignition ON.

    • Press the Read Vehicle Information button to view the results of the modules communicating on the network.

    • Press Read Vehicle Information button to retrieve DTC s from the vehicle.
      NOTE: DTC s may be displayed from previous diagnostic actions.

    • Retrieve the continuous memory DTC s.

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

    Does the VDM pass the Network Test? 

    Yes  RETRIEVE and RECORD all VDMDTCs. REFER to: Vehicle Dynamic Suspension . If there are no VDM Diagnostic Trouble Codes (DTCs). GO to  BR2
    No  DIAGNOSE the VDM does not communicate with the diagnostic scan tool, REFER to: Controller Area Network (CAN) Module Communications Network .

  3. BR2 RECHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE FOR THE LOST COMMUNICATION DTC (DIAGNOSTIC TROUBLE CODE)

    • Ignition ON.

    • Using a diagnostic scan tool, clear the ABS DTCs.

    • Ignition OFF.

    • Disconnect the diagnostic scan tool, exit the vehicle, close all doors and wait 10 minutes for all modules to completely shut down.

    • Ignition ON.

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

    Is DTC U0122:xx still present? 

    Yes  GO to  BR3
    No  If no Diagnostic Trouble Codes (DTCs) are present, the system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. For all other Diagnostic Trouble Codes (DTCs), GO to the DTC Chart: ABS Module.

  4. BR3 REVIEW THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST FOR VOLTAGE-REALTED DTCS

    • Review the recorded Diagnostic Trouble Codes (DTCs) from the ABS module self test.

    Is DTC U3003:16 or U3003:17 present in the ABS module? 

    Yes  For ABS module DTC U3003:16: GO to Pinpoint Test A  For ABS module DTC U3003:17: GO to Pinpoint Test F 
    No  GO to  BR4

  5. BR4 CHECK FOR VDM (VEHICLE DYNAMICS CONTROL MODULE) DTC (DIAGNOSTIC TROUBLE CODE) S

    • Ignition ON.

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

    Are any VDMDTCs present? 

    Yes  DIAGNOSE the VDMDTCs. REFER to: Vehicle Dynamic Suspension .
    No  GO to  BR5

  6. BR5 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 VDM 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. 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  BR6
    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. BR6 CHECK FOR COMMUNICATION DTC (DIAGNOSTIC TROUBLE CODE) S IN OTHER MODULES

    • Ignition ON.

    • Using a diagnostic scan tool retrieve all DTC s.

    Is DTC U0122:xx present in one or more modules in addition to the ABS module? 

    Yes  GO to  BR7
    No  GO to  BR8

  8. BR7 VERIFY VDM (VEHICLE DYNAMICS CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect VDM connector C439 .

    • Disconnect ABS module connector C135.

    • 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 VDM connector C4396 . Make sure it seats and latches correctly.

    • Connect ABS module connector C135. Make sure it 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 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 VDM. REFER to: Vehicle Dynamics Control Module (VDM) .
    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. BR8 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION

    • Ignition OFF.

    • Disconnect VDM connector C4396.

    • Disconnect ABS Module connector C135.

    • 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 Module connector C135. Make sure the connector seats and latches correctly.

    • Connect VDM connector C4396. Make sure it 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 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 EBB unit. REFER to: Electric Brake Booster (EBB) .
    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. Refer to Connector Repair Procedures for schematic and connector information.
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