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Possible Causes

  1. D1: CHECK THE COMMUNICATION NETWORK 
    NOTE: If the module does not communicate on the network, "Module not responding (or optional equipment module)" displays in the Description column.
    • Ignition ON, engine OFF.
    • Press the Read Vehicle Information button to view the results of the modules communicating on the network.
    • Retrieve the continuous memory DTCs.
    • Does the ABS module and the SASM pass the Network Test? 
    Yes No
    Go to  D2. DIAGNOSE the no communication with the ABS module or the SASM. REFER to Module Communications Network article.
  2. D2: CHECK THE SECM CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS) 

    Carry out the SECM self-test.

    • Clear the SECM DTCs.
    • Ignition OFF.
    • Ignition ON, engine OFF.
    • Wait at least 20 seconds for the SECM to validate the adaptive steering system.

    Carry out the SECM self-test.

    • Record the SECM DTCs.
    • Is DTC U0121:00 retrieved again? 
    Yes No
    Go to  D3. 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. D3: CHECK FOR SECM DTC U3003:16 AND U3003:17 
    • Review the results from the SECM self-test.
    • Is DTC U3003:16 or U3003:17 recorded? 
    Yes No
    For DTC U3003:16, GO to PINPOINT TEST A. 
    For DTC U3003:17, GO to PINPOINT TEST B. 
    For all others, No fault found.    		 Go to  D4.
  4. D4: CHECK FOR DTCS IN THE SASM 

    Carry out the SASM self-test.

    • Are any DTCs present in the SASM? 
    Yes No
    REFER to the SASM DTC Chart in the Anti-Lock Brake System (ABS) and Stability Control article. Go to  D5.
  5. D5: CHECK FOR DTCS IN THE ABS MODULE 

    Carry out the ABS self-test.

    • Are any DTCs present in the ABS module? 
    Yes No
    REFER to the ABS Module DTC Chart in the Anti-Lock Brake System (ABS) and Stability Control article. Go to  D6.
  6. D6: 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 ABS module and the SECM. 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 No
    Go to  D7. The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.
  7. D7: VERIFY ALL WIRING CONNECTIONS 
    • Ignition OFF.
    • Disconnect all SECM electrical connectors.
    • Disconnect the ABS module electrical 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
    • Are the connectors free of corrosion, damaged pins, bent pins, pushed-out pins and spread terminals? 
    Yes No
    Go to  D8. REPAIR the connector or terminals. Refer to the Connector Repair Procedures for schematic and connector information.
  8. D8: CHECK FOR DTC U0121:XX SET IN OTHER MODULES 
    • Connect the ABS module electrical connector. Make sure it seats and latches correctly.
    • Connect all SECM electrical connectors. Make sure they seat and latch correctly.
    • Ignition ON, engine OFF.
    • Wait at least 20 seconds for the SECM to validate the adaptive steering system.
    • Retrieve the continuous memory DTCs.
    • Is DTC U0121:xx set in 1 or more modules in addition to the SECM? 
    Yes No
    INSTALL a new ABS module.
    CHECK OASIS for any applicable service articles: TSBs, GSB, SSM#2 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) and Stability Control article.    		 INSTALL a new Steering Wheel (SECM) assembly.
    CHECK OASIS for any applicable service articles: TSBs, GSB, SSM#2 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 SECM (part of the steering wheel). REFER to Steering Column article.
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