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Home >> Ford >> 2022 >> Transit Connect Titanium, Gas/Ethanol >> Repair and Diagnosis >> External Pages >> Different car >> Section 740 (Supplemental Restraint System - Pinpoint Tests Aa Through AZ) >> Pinpoint Test Ac: B140C:11, B140C:12, B140C:13, B140C:1D

Pinpoint Test Ac: B140C:11, B140C:12, B140C:13, B140C:1D

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

    Normal Operation and Fault Conditions 

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

    The RCM continuously monitors the second row driver side seatbelt buckle sensor circuits for the following faults:

    • Open circuit
    • Short to voltage
    • Short to ground
    • Current out of range
    • Faulted second row driver seatbelt buckle sensor

    If a fault is detected, the RCM stores DTC B140C:11, B140C:12, B140C:13 or B140C:1D in memory and sends a message to the IPC to illuminate the airbag warning indicator.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    RCM B140C:11 Second Row Driver Side Seatbelt Sensor: Circuit Short To Ground A fault is indicated when the RCM senses a short to ground on the second row driver side seatbelt buckle sensor circuit for more than 6 seconds.
    RCM B140C:12 Second Row Driver Side Seatbelt Sensor: Circuit Short To Battery A fault is indicated when the RCM senses a short to voltage on the second row driver side seatbelt buckle sensor circuit for more than 6 seconds.
    RCM B140C:13 Second Row Driver Side Seatbelt Sensor: Circuit Open A fault is indicated when the RCM senses an open on either second row driver side seatbelt buckle sensor circuit for more than 6 seconds.
    RCM B140C:1D Second Row Driver Side Seatbelt Sensor: Circuit Current Out Of Range A fault is indicated when the RCM measures current outside of an acceptable range on the second row driver side seatbelt buckle sensor circuit for more than 6 seconds.

    Possible Sources 

    • Wiring, terminals or connectors
    • Second row driver side seatbelt buckle sensor
    • RCM

    Visual Inspection and Pre-checks 

    • Inspect for a damaged rear seatbelt buckle assembly.
    • Inspect for damaged wiring harness(es).
    • Inspect for loose or damaged connectors.

  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: SRS components should only be disconnected or reconnected 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. AC1 RETRIEVE RCM (RESTRAINTS CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

    • 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.

      REFER to: Pyrotechnic Device Health and Safety Precautions .

    • Ignition ON.

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

    Was DTC B140C:11, B140C:12, B140C:13 and B140C:1D retrieved on-demand during self-test? 

    Yes  This fault cannot be cleared until it is corrected and the DTC is no longer retrieved on-demand during self-test. For DTC B140C:11 or B140C:1D, GO to  AC2 For DTC B140C:12, GO to  AC4 For DTC B140C:13, GO to  AC5
    No  This is an intermittent fault when present as a CMDTC only. GO to  AC10

  9. AC2 CHECK THE SECOND ROW DRIVER SIDE SEATBELT BUCKLE SENSOR DTC (DIAGNOSTIC TROUBLE CODE) FOR A FAULT STATUS CHANGE (SHORT TO GROUND OR CURRENT OUT OF RANGE INDICATED)

    NOTE: This pinpoint test step attempts to change the fault reported by the RCM by inducing a different fault condition. If the reported fault changes, this indicates the RCM is functioning correctly and is not the source of the fault.

    • Ignition OFF.

    • Disconnect Second Row Driver Side Seatbelt Buckle Assembly C3557.

    • Ignition ON.

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

    • DIAGNOSTIC TIP:  When viewing Diagnostic Trouble Codes (DTCs) with the second row driver seatbelt buckle sensor disconnected, an open circuit fault is normally retrieved.

    Did the on-demand DTC change from B140C:11 or B140C:1D to B140C:13? 

    Yes  GO to  AC8
    No  For DTC B140C:11, GO to  AC3 For DTC B140C:1D, GO to  AC9

  10. AC3 CHECK THE SECOND ROW DRIVER SIDE SEATBELT BUCKLE SENSOR CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect RCM C310A and C310B.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3557-1
      GFD562389Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  AC9
    No  REPAIR the circuit. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to  AC11

  11. AC4 CHECK THE SECOND ROW DRIVER SIDE SEATBELT BUCKLE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect RCM C310A and C310B.

    • Disconnect Second Row Driver Side Seatbelt Buckle Assembly C3557.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3557-1
      GFD562392Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to  AC11
    No  GO to  AC9

  12. AC5 CHECK THE SECOND ROW DRIVER SIDE SEATBELT BUCKLE SENSOR DTC (DIAGNOSTIC TROUBLE CODE) FOR A FAULT STATUS CHANGE (OPEN INDICATED)

    NOTE: This pinpoint test step attempts to change the fault reported by the RCM by inducing a different fault condition. If the reported fault changes, this indicates the RCM is functioning correctly and is not the source of the fault.

    • Ignition OFF.

    • Disconnect Second Row Driver Side Seatbelt Buckle Assembly C3557.

    • Connect a fused jumper wire:
      Lead 1 Measurement / Action Lead 2
      C3557-1
      GFD562391Courtesy of FORD MOTOR COMPANY
      		 C3557-2

    • Ignition ON.

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

    • DIAGNOSTIC TIP:  When viewing Diagnostic Trouble Codes (DTCs) with the second row driver seatbelt buckle sensor circuits shorted together, a short to ground fault is normally retrieved.

    Did the on-demand DTC change from B140C:13 to B140C:11? 

    Yes  REMOVE the fused jumper wire and GO to  AC8
    No  REMOVE the fused jumper wire and GO to  AC6

  13. AC6 CHECK THE SECOND ROW DRIVER SIDE SEATBELT BUCKLE SENSOR CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect RCM C310A and C310B.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C310B-57
      GFD562389Courtesy of FORD MOTOR COMPANY
      		 C3557-1

    Is the resistance less than 0.5 ohm? 

    Yes  GO to  AC7
    No  REPAIR the circuit. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to  AC11

  14. AC7 CHECK THE SECOND ROW DRIVER SIDE SEATBELT BUCKLE SENSOR GROUND CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3557-2
      GFD562389Courtesy of FORD MOTOR COMPANY
      		 C310B-53

    Is the resistance less than 3 ohms? 

    Yes  GO to  AC9
    No  REPAIR the circuit. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to  AC11

  15. AC8 CONFIRM THE SECOND ROW DRIVER SIDE SEATBELT BUCKLE SENSOR FAULT

    NOTE: Make sure all SRS components and the RCM electrical connectors are connected before carrying out the self-test. If not, Diagnostic Trouble Codes (DTCs) are recorded.

    • Ignition OFF.

    • Prior to reconnecting any previously disconnected SRS component:

      • inspect connector(s) (including any inline connectors) for pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
      • inspect wiring harness for any damaged, pinched, cut or pierced wires.
      • inspect RCM C310A and C310B Connector Position Assurance (CPA) lever/lock for correct operation.
      • repair any concerns found. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information.

    • Connect Second Row Driver Side Seatbelt Buckle Assembly C3557.

    • Ignition ON.

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

    Was the original DTC retrieved on-demand during self-test? 

    Yes  INSTALL a new rear seatbelt buckle assembly (includes second row driver seatbelt buckle and sensor). REFER to: Rear Seatbelt Buckle LH . GO to  AC11
    No  In the process of diagnosing the fault, the fault condition has become intermittent. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test. GO to  AC10

  16. AC9 CONFIRM THE RCM (RESTRAINTS CONTROL MODULE) FAULT

    NOTE: Make sure all SRS components and the RCM electrical connectors are connected before carrying out the self-test. If not, Diagnostic Trouble Codes (DTCs) are recorded.

    • Ignition OFF.

    • Prior to reconnecting any previously disconnected SRS component:

      • inspect connector(s) (including any inline connectors) for pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
      • inspect wiring harness for any damaged, pinched, cut or pierced wires.
      • inspect RCM C310A and C310B Connector Position Assurance (CPA) lever/lock for correct operation.
      • repair any concerns found. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information.

    • Connect RCM C310A and C310B (if previously disconnected).

    • Connect Second Row Driver Side Seatbelt Buckle Assembly C3557.

    • Ignition ON.

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

    Was the original DTC retrieved on-demand during self-test? 

    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 RCM. REFER to: Restraints Control Module (RCM) . GO to  AC11
    No  In the process of diagnosing the fault, the fault condition has become intermittent. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test. GO to  AC10

  17. AC10 CHECK FOR AN INTERMITTENT FAULT

    • Ignition OFF.

    • Disconnect Second Row Driver Side Seatbelt Buckle Assembly C3557.

      • Inspect connector(s) (including any inline connectors) for corrosion, loose or spread terminals and loose or frayed wire connections at terminals.
      • Inspect wiring harness for any damage, pinched, cut or pierced wires.
      • Inspect RCM C310A and C310B Connector Position Assurance (CPA) lever/lock for correct operation.
      • Repair any concerns found. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information.

    • Connect all  previously disconnected components and connectors.

    • Ignition ON.

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

    Was DTC B140C:11, B140C:12, B140C:13 and B140C:1D retrieved on-demand during self-test? 

    Yes  This fault cannot be cleared until it is corrected and the DTC is no longer retrieved on-demand during self-test. For DTC B140C:11 or B140C:1D, GO to  AC2 For DTC B140C:12, GO to  AC4 For DTC B140C:13, GO to  AC5
    No  The fault is not present and cannot be recreated at this time. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test. GO to  AC11

  18. AC11 CHECK FOR ADDITIONAL SRS (SUPPLEMENTAL RESTRAINT SYSTEM) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Ignition OFF.

    • Connect all  previously disconnected components and connectors.

    • Ignition ON.

    • NOTE: When selecting Restraints from the Self Test menu, DTCs are retrieved from the RCM and OCSM.

      Using a diagnostic scan tool, perform

      Restraints  self-test.

    Are any RCM or OCSM Diagnostic Trouble Codes (DTCs) retrieved on-demand during self-test? 

    Yes  Do not clear any Diagnostic Trouble Codes (DTCs) until all  Diagnostic Trouble Codes (DTCs) have been resolved. DIAGNOSE and REPAIR the SRS Diagnostic Trouble Codes (DTCs). REFER to the DTC Chart In this article.
    No  The repair is complete. RETURN the vehicle to the customer.
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