Pinpoint Test OO - DTC: B140C:11, B140C:12, B140C:13 and B140C:1D

Diagnostic Overview 

Refer to Supplemental Restraint System for schematic and connector information.

Normal Operation and Fault Conditions 

On vehicles equipped with inflatable seatbelts, the RCM monitors the second row left seatbelt buckle switch and circuits for the following faults:

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

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 Conditions
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 left seatbelt buckle switch.
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 left seatbelt buckle switch.
B140C:13	Second Row Driver Side Seatbelt Sensor: Circuit Open	A fault is indicated when the RCM senses an open on either second row left seatbelt buckle switch circuit.
B140C:1D	Second Row Driver Side Seatbelt Sensor: Circuit Current Out of Range	A fault is indicated when the RCM senses current out of an acceptable range between the second row left seatbelt buckle switch circuits.

Possible Sources 

• Wiring, terminals or connectors
• Second row LH seatbelt buckle (part of rear seatbelt buckle assembly)
• RCM

Visual Inspection and Diagnostic Pre-checks 

• Inspect for a damaged second row left inflatable seatbelt buckle
• Inspect for damaged wiring harness(es)
• Inspect for loose or damaged connectors

PINPOINT TEST A : B140C:11, B140C:12, B140C:13 AND B140C:1D 

1. 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.
2. NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
3. 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.
4. 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.
5. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
6. A1 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 - FUSION (EXCEPT HYBRID) . 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, perform RCM self-test.

   Was DTC B140C:11, B140C:12, B140C:13 or 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  A2. For DTC B140C:12, GO to  A4. For DTC B140C:13, GO to  A5

   No	This is an intermittent fault when present as a CMDTC only. GO to  A10

7. A2 CHECK THE SECOND ROW DRIVER SIDE SEATBELT 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.
   • Depower the SRS. Refer to: Supplemental Restraint System (SRS) Depowering and Repowering .
   • Disconnect Second Row Seatbelt Buckle Assembly C3646 .
     • Fold down the second row seat backrest.
     • To access the second row seatbelt buckle assembly connector, pull up the trunk floor carpet where the trunk floor meets the second row seat backrest.

   • Repower the SRS. Do not prove out the SRS at this time. Refer to: Supplemental Restraint System (SRS) Depowering and Repowering .
   • Ignition ON.
   • Using a diagnostic scan tool, perform RCM self-test.
   • DIAGNOSTIC TIP:  When viewing Diagnostic Trouble Codes (DTCs) with the second row left seatbelt buckle switch disconnected, an open circuit fault is normally retrieved. An open circuit fault will also be retrieved for the second row right seatbelt buckle, since the second row right buckle switch circuits pass through the same connector.

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

   Yes

   GO to  A8

   No	For DTC B140C:11, GO to  A3. For DTC B140C:1D, GO to  A9

8. A3 CHECK THE SECOND ROW LEFT SEATBELT BUCKLE SWITCH CIRCUIT FOR A SHORT TO GROUND
   
   
   • Ignition OFF.
   • Depower the SRS. Refer to: Supplemental Restraint System (SRS) Depowering and Repowering .
   • Disconnect RCM C310A and C310B .
   • Measure:

     Positive Lead	Measurement / Action	Negative Lead
     C3646-4	Courtesy of FORD MOTOR COMPANY	Ground

   Is the resistance greater than 10, 000 ohms? 

   Yes

   GO to  A9

   No	REPAIR the circuit. Refer to Connector Repair Procedures for schematic and connector information. GO to  A11

9. A4 CHECK THE SECOND ROW LEFT SEATBELT BUCKLE SWITCH CIRCUIT FOR A SHORT TO VOLTAGE
   
   
   • Ignition OFF.
   • Depower the SRS. Refer to: Supplemental Restraint System (SRS) Depowering and Repowering .
   • Disconnect RCM C310A and C310B .
   • Disconnect Second Row Seatbelt Buckle Assembly C3646 .
     • Fold down the second row seat backrest.
     • To access the second row seatbelt buckle assembly connector, pull up the trunk floor carpet where the trunk floor meets the second row seat backrest.

   • Repower the SRS. Do not prove out the SRS at this time. Refer to: Supplemental Restraint System (SRS) Depowering and Repowering .
   • Ignition ON.
   • Measure:

     Positive Lead	Measurement / Action	Negative Lead
     C3646-4	Courtesy of FORD MOTOR COMPANY	Ground

   Is any voltage present? 

   Yes	REPAIR the circuit. Refer to Connector Repair Procedures for schematic and connector information. GO to  A11

   No

   GO to  A9

10. A5 CHECK THE SECOND ROW DRIVER SIDE SEATBELT 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.
      WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.
    • Disconnect Second Row Seatbelt Buckle Assembly C3646 .
      • Fold down the second row seat backrest.
      • To access the second row seatbelt buckle assembly connector, pull up the trunk floor carpet where the trunk floor meets the second row seat backrest.

    • Connect a fused jumper wire:

      Lead 1	Measurement / Action	Lead 2
      C3646-4	Courtesy of FORD MOTOR COMPANY	C3646-5

    • Repower the SRS. Do not prove out the SRS at this time. Refer to: Supplemental Restraint System (SRS) Depowering and Repowering .
    • Ignition ON.
    • Using a diagnostic scan tool, perform RCM self-test.
    • DIAGNOSTIC TIP:  When viewing Diagnostic Trouble Codes (DTCs) with the driver seatbelt buckle switch circuits shorted together, a short to ground fault is normally retrieved. An open circuit fault will also be retrieved for the second row right seatbelt buckle, since the second row right buckle switch circuits pass through the same connector.

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

    Yes	REMOVE the fused jumper wire and GO to  A8

    No	REMOVE the fused jumper wire and GO to  A6

11. A6 CHECK THE SECOND ROW LEFT SEATBELT BUCKLE SWITCH CIRCUIT FOR AN OPEN
    
    
    • Ignition OFF.
    • Depower the SRS. Refer to: Supplemental Restraint System (SRS) Depowering and Repowering .
    • Disconnect RCM C310A and C310B .
    • Measure:

      Positive Lead	Measurement / Action	Negative Lead
      C310B-56	Courtesy of FORD MOTOR COMPANY	C3646-4

    Is the resistance less than 0.5 ohm? 

    Yes

    GO to  A7

    No	REPAIR the circuit. Refer to Connector Repair Procedures for schematic and connector information. GO to  A11

12. A7 CHECK THE SECOND ROW LEFT SEATBELT BUCKLE SWITCH GROUND CIRCUIT FOR AN OPEN
    
    
    • Measure:

      Positive Lead	Measurement / Action	Negative Lead
      C3646-5	Courtesy of FORD MOTOR COMPANY	C310B-53

    Is the resistance less than 3 ohms? 

    Yes

    GO to  A9

    No	REPAIR the circuit. Refer to Connector Repair Procedures for schematic and connector information. GO to  A11

13. A8 CONFIRM THE DRIVER SEATBELT BUCKLE SWITCH 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) will be recorded.
    • Ignition OFF.
    • Depower the SRS. Refer to: Supplemental Restraint System (SRS) Depowering and Repowering .
    • 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 wire 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 Connector Repair Procedures for schematic and connector information.

    • Connect RCM C310A and C310B .
    • Connect Second Row Seatbelt Buckle Assembly C3646 .
    • Repower the SRS. Do not prove out the SRS at this time. Refer to: Supplemental Restraint System (SRS) Depowering and Repowering .
    • Ignition ON.
    • Using a diagnostic scan tool, perform RCM self-test.

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

    Yes	INSTALL a new rear seatbelt buckle assembly (includes second row left inflatable seatbelt buckle). Refer to: Rear Seatbelt Buckle Assembly - Vehicles With: Inflatable Seatbelts . GO to  A11

    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  A10

14. A9 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) will be recorded.
    • Ignition OFF.
    • Depower the SRS. Refer to: Supplemental Restraint System (SRS) Depowering and Repowering .
    • 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 wire 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 Connector Repair Procedures for schematic and connector information.

    • Connect RCM C310A and C310B .
    • Connect Second Row Seatbelt Buckle Assembly C3646 .
    • Repower the SRS. Do not prove out the SRS at this time. Refer to: Supplemental Restraint System (SRS) Depowering and Repowering .
    • Ignition ON.
    • Using a diagnostic scan tool, perform RCM self-test.

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

    Yes	CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new RCM. Refer to: Restraints Control Module (RCM) . GO to  A11

    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  A10

15. A10 CHECK FOR AN INTERMITTENT FAULT
    
    
    • Ignition OFF.
    • Depower the SRS. Refer to: Supplemental Restraint System (SRS) Depowering and Repowering .
    • Disconnect RCM C310A and C310B .
    • Disconnect Second Row Seatbelt Buckle Assembly C3646 .
      • Fold down the second row seat backrest.
      • To access the second row seatbelt buckle assembly connector, pull up the trunk floor carpet where the trunk floor meets the second row seat backrest.
      • Inspect connector(s) (including any inline connectors) for corrosion, loose or spread terminals and loose or frayed wire connections at terminals.
      • Inspect wire harness for any damage, pinched, cut or pierced wires.
      • Repair any concerns found. Refer to Connector Repair Procedures for schematic and connector information.

    • Inspect RCM C310A and C310B Connector Position Assurance (CPA) lever/lock for correct operation.
    • Connect all previously disconnected component(s) / connector(s).
    • Repower the SRS. Do not prove out the SRS at this time. Refer to: Supplemental Restraint System (SRS) Depowering and Repowering .
    • Ignition ON.
    • Using a diagnostic scan tool, perform RCM self-test.

    Was DTC B140C:11, B140C:12, B140C:13 or 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  A2. For DTC B140C:12, GO to  A4. For DTC B140C:13, GO to  A5

    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  A11

16. A11 CHECK FOR ADDITIONAL SRS (SUPPLEMENTAL RESTRAINT SYSTEM) DIAGNOSTIC TROUBLE CODES (DTCS)
    
    
    WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.
    • Ignition OFF.
    • Reconnect all SRS components (if previously disconnected).
    • If previously directed to depower the SRS, repower the SRS. Do not prove out the SRS at this time. Refer to: Supplemental Restraint System (SRS) Depowering and Repowering .
    • Ignition ON.
    • NOTE: When selecting Restraints from the Self Test menu, DTCs are retrieved from the RCM, OCSM and, if equipped, BECMB.

      Using a diagnostic scan tool, perform

      Restraints  self-test.

    Are any RCM, OCSM and/or BECMB 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. Refer to DIAGNOSIS AND TESTING .

    No	The repair is complete. RETURN the vehicle to the customer.