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Pinpoint Test V: Abs (Anti-Lock Brake System) Module Communication Concern With The GSM (Gear Shift Module)

  1. Refer to Wiring Diagrams - Vehicle Dynamic Systems for schematic and connector information.

    Normal Operation and Fault Conditions 

    With the ignition ON, the GWM sends messages to the GSM over the HS-CAN2, the GWM relays these messages to the ABS module over the FD-CAN. If the ABS module does not receive these messages within the specified time frame, the ABS module sets DTC s. This can be due to a GSM 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 GSM.

    For information on the messages sent to the ABS module by the GSM, 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 U0103:00 Lost Communication With Gear Shift Control Module A: No Sub Type Information This DTC sets when the ABS module does not receive any messages from the GSM within the allowed time.
    ABS U0404:00 Invalid Data Received from Gear Shift Control Module A: No Sub Type Information This DTC sets when the ABS module receives messages from the GSM, but the messages contain invalid data.

    Possible Causes 

    • Network communication concern
    • GWM
    • GSM

  2. V1 CHECK THE COMMUNICATION NETWORK

    • Ignition ON.

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

    Does the GSM pass the Network Test? 

    Yes  DIAGNOSE the GSMDTC s. If there are no GSMDTC s, GO to  V2
    No  DIAGNOSE the no communication with the GSM. REFER to: COMMUNICATIONS NETWORK .

  3. V2 CHECK FOR RETURNING ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DTC (DIAGNOSTIC TROUBLE CODE) S

    • Using a diagnostic scan tool, clear the ABS module DTC s.

    • Ignition ON.

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

    • Record all ABS module DTC s.

    Are any of the DTC s in the DTC Fault Trigger Conditions table retrieved again? 

    Yes  GO to  V3
    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. V3 CHECK FOR VOLTAGE-RELATED DTC (DIAGNOSTIC TROUBLE CODE) S IN THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE

    • Review the recorded DTC s from the ABS module.

    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 G 
    No  GO to  V4

  5. V4 RETRIEVE ALL GSM (GEAR SHIFT MODULE) DTC (DIAGNOSTIC TROUBLE CODE) S

    • Ignition ON.

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

    • Record all DTC s from the GSM self-test.

    Are any GSMDTC s present? 

    Yes  DIAGNOSE the GSMDTC s . REFER to: External Controls - Vehicles Built From: 25-October-2021 .
    No  GO to  V5

  6. V5 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 TCCM 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  V6
    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. V6 CHECK FOR COMMUNICATION DIAGNOSTIC TROUBLE CODES (DTCS) IN OTHER MODULES

    • Ignition ON.

    • Using a diagnostic scan tool, clear the ABS module DTC s.

    • Using a diagnostic scan tool retrieve all DTC s.

    Is DTC U0103:xx or U0404:xx present in one or more modules in addition to the ABS module? 

    Yes  GO to  V7
    No  For Electric brake booster::  GO to  V9
    For Vacuum brake booster::  GO to  V8
    For all others:: 
    Test is complete and no faults were found.

  8. V7 VERIFY GSM (GEAR SHIFT MODULE) OPERATION

    • Disconnect GSM 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

    • 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 service articles address this concern, INSTALL a new GSM. REFER to: Gear Shift Module (GSM) .
    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.

  9. V8 VERIFY ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION

    • Ignition OFF.

    • Disconnect GSM C3590 (column shift) or C3245  (floor shifter).

    • Disconnect ABS module C155A.

    • 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 C155A. Make sure it seats and latches correctly.

    • Connect GSM connector C3590 (column shift) or C3245  (floor shifter). 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 applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSB s address this concern, INSTALL a new ABS. 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. Refer to Wiring Diagrams - Connector Repair Procedures for schematic and connector information.

  10. V9 VERIFY ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION

    • Disconnect GSM 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 GSM 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 module. 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 Wiring Diagrams - Connector Repair Procedures for schematic and connector information.
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