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Home >> Ford >> 2023 >> Mustang Mach-E Select, RWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System - Pinpoint Tests BA - BS >> Pinpoint Test BM: U0100:87

Pinpoint Test BM: U0100:87

  1. Refer to SUPPLEMENTAL RESTRAINT SYSTEM for schematic and connector information.

    Normal Operation and Fault Conditions 

    The BECMB uses information contained in messages from the PCM sent on the HS-CAN1.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    BECMB U0100:87 Lost Communication With ECM/PCM 'A': Missing Message This DTC sets if the BECMB does not receive an expected message from the PCM.

    Possible Sources 

    • Network traffic
    • PCM
    • BECMB
    • Incorrect BECMB configuration
    • Incorrect BECMB installed

    WARNING: Do not handle, move or change the original horizontal mounting position of the Restraints Control Module (RCM) while the Restraints Control Module (RCM) is connected and the ignition switch is ON. Failure to follow this instruction may result in the accidental deployment of the Safety Canopy® and cause serious personal injury or death.
    NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
    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.
    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.

  2. BM1 VERIFY DIAGNOSTIC SCAN TOOL COMMUNICATION WITH THE PCM (POWERTRAIN CONTROL MODULE)

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

    REFER to: Pyrotechnic Device Health and Safety Precautions .

    • 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  GO to BM2 
    No  To diagnose no communication with the PCM, REFER to: Controller Area Network (CAN) Module Communications Network .

  3. BM2 CHECK THE BECMB (BATTERY ENERGY CONTROL MODULE B) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)

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

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

    • Wait 10 seconds.

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

    Is DTC U0100:87 retrieved again? 

    Yes  GO to BM3 
    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. BM3 CHECK FOR THE CORRECT BECMB (BATTERY ENERGY CONTROL MODULE B)

    • Using the Log Viewer function of the diagnostic scan tool, retrieve and record the BECMB part number.

    • Check the recorded part number against the number listed in the Ford parts catalog.

    Does the recorded part number match the number listed in the Ford parts catalog? 

    Yes  GO to BM4 
    No  INSTALL the correct BECMB and use As-Built data when carrying out PMI. REFER to: Battery Energy Control Module B (BECMB) . GO to BM6 

  5. BM4 VERIFY THE BECMB (BATTERY ENERGY CONTROL MODULE B) CONFIGURATION

    • Carry out PMI for the BECMB. Manually enter As-Built data. Refer to the diagnostic scan tool instructions when carrying out PMI.

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

    • Wait 10 seconds.

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

    Is DTC U0100:87 retrieved again? 

    Yes  GO to BM5 
    No  The system is operating correctly at this time. The DTC was caused by an incorrect RCM configuration. GO to BM6 

  6. BM5 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 article for the procedure.
    No  GO to BM6 

  7. BM6 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0100:00 SET IN MODULES OTHER THAN THE BECMB (BATTERY ENERGY CONTROL MODULE B)

    • 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, INSTALL a new PCM. Refer to POWERTRAIN CONTROL MODULE (PCM)
    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 BECMB. REFER to: Battery Energy Control Module B (BECMB) .
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