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Pinpoint Test BJ: U0100:00

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
  1. Refer to Wiring Diagrams SUPPLEMENTAL RESTRAINT SYSTEM for schematic and connector information.

    Normal Operation and Fault Conditions 

    The OCSM and RCM both use information contained in messages from the PCM sent on the HS-CAN.

    For more information, REFER to: Airbag and Seatbelt Pretensioner Supplemental Restraint System (SRS) - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    OCSM U0100:00 Lost Communication With ECM/PCM "A": No Sub Type Information This DTC sets if the OCSM does not receive an expected message from the PCM.
    RCM U0100:00 Lost Communication With ECM/PCM "A": No Sub Type Information This DTC sets if the RCM does not receive an expected message from the PCM.

    Possible Sources 

    • Network traffic
    • PCM
    • OCSM

  2. WARNING: Incorrect repair techniques or actions can cause an accidental Supplemental Restraint System (SRS) deployment. Never compromise or depart from these instructions. Failure to precisely follow all instructions could result in serious personal injury from an accidental deployment.
  3. NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.
  4. NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
  5. NOTE: Only disconnect or reconnect SRS components when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS.
  6. NOTE: Always make sure the correct SRS component is being installed. Parts released for other vehicles may not be compatible even if they appear physically similar. Check the part number listed in the Ford parts catalog to make sure the correct component is being installed. If an incorrect SRS component is installed, Diagnostic Trouble Codes (DTCs) may set.
  7. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.

  8. BJ1 VERIFY DIAGNOSTIC SCAN TOOL COMMUNICATION WITH THE PCM (POWERTRAIN CONTROL MODULE)

    WARNING: Before beginning any service procedure In this article, refer to Safety warnings in General Information. Failure to follow this instruction may result in serious personal injury.

    • Ignition ON.

    • Connect the diagnostic scan tool.

    • Check that a vehicle session can be established using the diagnostic scan tool.

    Can a vehicle session be established? 

    Yes  If DTC U0100:00 was retrieved from the OCSM, GO to  BJ2 If DTC U0100:00 was retrieved from the RCM, GO to  BJ3
    No  To diagnose no communication with the PCM, REFER to: Controller Area Network (CAN) Module Communications Network .

  9. BJ2 CHECK THE OCSM (OCCUPANT CLASSIFICATION SYSTEM MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)

    • Using a diagnostic scan tool, perform OCSM self-test.

    • Using a diagnostic scan tool, clear OCSM Diagnostic Trouble Codes (DTCs).

    • Wait 10 seconds.

    • Using a diagnostic scan tool, perform OCSM self-test.

    Is DTC U0100:00 retrieved again? 

    Yes  GO to  BJ4
    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.

  10. BJ3 CHECK THE RCM (RESTRAINTS CONTROL MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)

    • Using a diagnostic scan tool, perform RCM self-test.

    • Using a diagnostic scan tool, clear RCM Diagnostic Trouble Codes (DTCs).

    • Wait 10 seconds.

    • Using a diagnostic scan tool, perform RCM self-test.

    Is DTC U0100:00 retrieved again? 

    Yes  GO to  BJ4
    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.

  11. BJ4 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE PCM (POWERTRAIN CONTROL MODULE) KOEO (KEY ON, ENGINE OFF) SELF-TEST

    • Using a diagnostic scan tool, perform PCM self-test.

    • Check for recorded Diagnostic Trouble Codes (DTCs) from the PCMKOEO self-test.

    Is DTC P0562 or P0563 recorded? 

    Yes  DIAGNOSE the PCM Diagnostic Trouble Codes (DTCs). Refer to the appropriate Engine System article for the procedure.
    No  If DTC U0100:00 was originally retrieved from the OCSM, GO to  BJ5 If DTC U0100:00 was originally retrieved from the RCM, GO to  BJ6

  12. BJ5 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE OCSM (OCCUPANT CLASSIFICATION SYSTEM MODULE) SELF-TEST

    • Using a diagnostic scan tool, perform OCSM self-test.

    • Check for recorded Diagnostic Trouble Codes (DTCs) from the OCSM self-test.

    Is DTC U3003:16 or U3003:17 recorded? 

    Yes  GO to Pinpoint Test BD 
    No  GO to  BJ7

  13. BJ6 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE RCM (RESTRAINTS CONTROL MODULE) SELF-TEST

    • Using a diagnostic scan tool, perform RCM self-test.

    • Check for recorded Diagnostic Trouble Codes (DTCs) from the RCM self-test.

    Is DTC U3003:16 or U3003:17 recorded? 

    Yes  GO to Pinpoint Test BD 
    No  GO to  BJ8

  14. BJ7 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0100:00 SET IN MODULES OTHER THAN THE OCSM (OCCUPANT CLASSIFICATION SYSTEM MODULE)

    • Using a diagnostic scan tool, perform self-test for all modules.

    Is DTC U0100:00 set in the ABS module or in the RCM? 

    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, Refer to PCM GUIDED ROUTINE TESTING
    Internet Explorer version 11 or greater is required to perform this Pinpoint Test. 
    No  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 OCSM. REFER to: Occupant Classification System (OCS) Sensor - Vehicles With: Multi-Contour Seats . or REFER to: Occupant Classification System (OCS) Sensor - Vehicles Without: Multi-Contour Seats .

  15. BJ8 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0100:00 SET IN OTHER MODULES OTHER THAN THE RCM (RESTRAINTS CONTROL MODULE)

    • Using a diagnostic scan tool, perform self-test for all modules.

    Is DTC U0100:00 set in the ABS module or in the OCSM? 

    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, Refer to PCM GUIDED ROUTINE TESTING
    Internet Explorer version 11 or greater is required to perform this Pinpoint Test. 
    No  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 RCM. REFER to: Restraints Control Module (RCM) .
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