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Home >> Ford >> 2012 >> Explorer Base, 3.5 8, AWD, 6F50 >> Repair and Diagnosis >> External Pages >> Different car >> Section 161 (Supplemental Restraint System) >> Diagnosis And Testing >> Airbag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Test - Restraints Control Module (RCM) >> Pinpoint Test Y: DTC B2909 >> Pinpoint Test Y: DTC B2909

Pinpoint Test Y: DTC B2909

WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Never probe the electrical connectors on airbag, Safety Canopy or side air curtain assemblies. Failure to follow this instruction may result in the accidental deployment of these assemblies, which increases the risk of serious personal injury or death.
WARNING: Never disassemble or tamper with seat belt deployable components, including pretensioners, load limiters and inflators. Never back probe deployable device electrical connectors. Tampering or back probing may cause an accidental deployment and result in personal injury or death.
NOTE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.
Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
NOTE: Supplemental Restraint System (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.
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 Catalog Advantage™ or equivalent to make sure the correct component is being installed. If an incorrect SRS component is installed, DTCs may set.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  1. Y1 RETRIEVE OCSM DTCs 
    • Enter the following diagnostic mode on the scan tool: Self Test - OCSM.
    • Enter the following diagnostic mode on the scan tool: DataLogger - OCSM - View and Record All 2909 Fault PIDs.
      • NOTE: Do not mistake status information displayed with DTCs for fault PID information. Fault PIDs are only retrieved in the DataLogger function of the scan tool.

        Refer to PID list in Normal Operation to view 2909 fault PIDs.

    • Do any on-demand 2909 fault PIDs indicate a fault? 
    • Yes  : This fault cannot be cleared until it is corrected and the DTC is no longer retrieved on-demand during self-test.

      For fault PID 2909_31_OD, GO to Y2.

      For fault PID 2909_28_OD, GO to  Y8.

      For fault PID 2909_30_OD, GO to  Y9.

      For fault PID 2909_29_OD, GO to  Y10.

    • No  : This is an intermittent fault when present as a Continuous Memory Diagnostic Trouble Code (CMDTC) only. GO to  Y14.
  2. Y2 CHECK BTS CIRCUITS FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Passenger Seat Side Air Bag Module C337.
    • Disconnect: BTS C3238.
    • Disconnect: OCSM C3043.
    • Repower the SRS. Do not  prove out the SRS at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Ignition ON.
    • Measure the voltage between OCSM:
      • C3043-5, circuit LR142 (YE/BU), harness side and ground.
      • C3043-6, circuit VR210 (BU/BN), harness side and ground.
        Fig 1: Checking BTS Circuits For Short To Voltage
        G07991789Courtesy of FORD MOTOR CO.
    • Is voltage present on either circuit? 
    • Yes  : REPAIR the affected circuit(s). Refer to appropriate "OEM Connector Repair Procedures" for information. GO to  Y15.
    • No  : GO to Y3.
  3. Y3 CHECK BTS CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • Measure the resistance between OCSM C3043-4, circuit GD138 (BK/WH), harness side and ground.
      Fig 2: Measuring Resistance Between OCSM C3043-4, Circuit GD138 (BK/WH) And Ground
      G07991778Courtesy of FORD MOTOR CO.
    • Measure the resistance between OCSM C3043, harness side and BTS C3238, harness side using the following chart:
      OCSM Circuit BTS
      C3043-5 LR142 (YE/BU) C3238-1
      C3043-6 VR210 (BU/BN) C3238-3
      Fig 3: Measuring Resistance Between OCSM C3043 And BTS C3238
      G07991791Courtesy of FORD MOTOR CO.
    • Are the resistances less than 0.5 ohm? 
    • Yes  : GO to Y4.
    • No  : REPAIR the affected circuit(s). Refer to appropriate "OEM Connector Repair Procedures" for information.

      GO to  Y15.

  4. Y4 CHECK BTS VREF AND SIGNAL CIRCUITS FOR A SHORT TO GROUND 
    • Measure the resistance between OCSM:
      • C3043-5, circuit LR142 (YE/BU), harness side and ground.
      • C3043-6, circuit VR210 (BU/BN), harness side and ground.
        Fig 4: Checking BTS VREF And Signal Circuits For Short To Ground
        G07991792Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10, 000 ohms? 
    • Yes  : GO to Y5.
    • No  : REPAIR the affected circuit(s). Refer to appropriate "OEM Connector Repair Procedures" for information. GO to  Y15.
  5. Y5 CHECK FOR A SHORT BETWEEN BTS CIRCUITS 
    • Measure the resistance between BTS:
      • C3238-3, circuit VR210 (BU/BN), harness side and C3238-1, circuit LR142 (YE/BU), harness side.
      • C3238-3, circuit VR210 (BU/BN), harness side and C3238-2, circuit GD138 (BK/WH), harness side.
      • C3238-1, circuit LR142 (YE/BU), harness side and C3238-2, circuit GD138 (BK/WH), harness side.
        Fig 5: Checking BTS Circuits For Short
        G06100126Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10, 000 ohms? 
    • Yes  : GO to Y6.
    • No  : REPAIR the affected circuits. Refer to appropriate "OEM Connector Repair Procedures" for information. GO to  Y11.
  6. Y6 CHECK OCSM OUTPUT 
    • Connect: OCSM C3043.
    • Ignition ON.
    • Measure the voltage between BTS C3238-1, circuit LR142 (YE/BU), harness side and C3238-2, circuit GD138 (BK/WH), harness side.
      Fig 6: Measuring Voltage Between BTS C3238-1, Circuit LR142 (YE/BU) And C3238-2, Circuit GD138 (BK/WH)
      G06404172Courtesy of FORD MOTOR CO.
    • Is the voltage approximately 5 volts? 
  7. Y7 CHECK BTS VOLTAGE OUTPUT 
    • Ignition OFF.
    • Connect a fused jumper wire between BTS C3238-1, circuit LR142 (YE/BU), harness side and C3238 pin 1, component side.
    • Connect a fused jumper wire between BTS C3238-2, circuit GD138 (BK/WH), harness side and C3238 pin 2, component side.
    • Ignition ON.
    • Measure the voltage between BTS C3238 pin 1, circuit VR210 (BU/BN), component side and ground as the tension of the BTS varies by pulling upward at the safety belt webbing.
      Fig 7: Measuring Voltage Between BTS C3238 Pin 1, Circuit VR210 (BU/BN) And Ground
      G06184235Courtesy of FORD MOTOR CO.
    • Does the voltage vary from approximately 0.95 volt with no tension applied to the sensor to approximately 3.8 volts with full tension applied to the sensor? 
  8. Y8 CHECK BTS CIRCUITS FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Passenger Seat Side Air Bag Module C337.
    • Disconnect: BTS C3238.
    • Disconnect: OCSM C3043.
    • Repower the SRS. Do not  prove out the system at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Ignition ON.
    • Measure the voltage between BTS:
      • C3238-3, circuit VR210 (BU/BN), harness side and ground.
      • C3238-1, circuit LR142 (YE/BU), harness side and ground.
        Fig 8: Checking BTS Circuits For Short To Voltage
        G06404174Courtesy of FORD MOTOR CO.
    • Is any voltage present on either circuit? 
    • Yes  : REPAIR the affected circuit(s). Refer to appropriate "OEM Connector Repair Procedures" for information. GO to  Y15.
    • No  : GO to  Y13.
  9. Y9 CHECK BTS CIRCUITS FOR AN OPEN 
    • 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: BTS C3238.
    • Disconnect: OCSM C3043.
    • Measure the resistance between OCSM C3043-4, circuit GD138 (BK/WH), harness side and ground.
      Fig 9: Measuring Resistance Between OCSM C3043-4, Circuit GD138 (BK/WH) And Ground
      G07991778Courtesy of FORD MOTOR CO.
    • Measure the resistance between OCSM C3043, harness side and BTS C3238, harness side using the following chart:
      OCSM Circuit BTS
      C3043-5 LR142 (YE/BU) C3238-1
      C3043-6 VR210 (BU/BN) C3238-3
      Fig 10: Measuring Resistance Between OCSM C3043 And BTS C3238
      G07991791Courtesy of FORD MOTOR CO.
    • Are the resistances less than 0.5 ohm? 
    • Yes  : GO to  Y11.
    • No  : REPAIR the affected circuit(s). Refer to appropriate "OEM Connector Repair Procedures" for information. GO to  Y15.
  10. Y10 CHECK BTS CIRCUITS FOR A SHORT TO GROUND 
    • 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: BTS C3238.
    • Disconnect: OCSM C3043.
    • Measure the resistance between BTS:
      • C3238-3, circuit VR210 (BU/BN, harness side and ground.
      • C3238-1, circuit LR142 (YE/BU), harness side and ground.
        Fig 11: Checking BTS Circuits For Short To Ground
        G06184233Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10, 000 ohms? 
    • Yes  : GO to  Y11.
    • No  : REPAIR the affected circuit(s). Refer to appropriate "OEM Connector Repair Procedures" for information. GO to  Y15.
  11. Y11 CHECK THE OCSM OUTPUT 
    • Connect: OCSM C3043.
    • Ignition ON.
    • Measure the voltage between BTS C3238-1, circuit LR142 (YE/BU), harness side and C3238-2, circuit GD138 (BK/WH), harness side.
      Fig 12: Measuring Voltage Between BTS C3238-1, Circuit LR142 (YE/BU) And C3238-2, Circuit GD138 (BK/WH)
      G06404172Courtesy of FORD MOTOR CO.
    • Is the voltage approximately 5 volts? 
  12. Y12 CHECK BTS VOLTAGE OUTPUT 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Passenger Seat Side Air Bag Module C337.
    • Connect a fused jumper wire between BTS C3238-1, circuit LR142 (YE/BU), harness side and C3238 pin 1, component side.
    • Connect a fused jumper wire between BTS C3238-2, circuit GD138 (BK/WH), harness side and C3238 pin 2, component side.
    • Repower the SRS. Do not  prove out the system at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Ignition ON.
    • Measure the voltage between BTS C3238 pin 3, component side and ground as the tension of the BTS varies by pulling upward at the safety belt webbing.
      Fig 13: Measuring Voltage Between BTS C3238 Pin 3 And Ground
      G06184235Courtesy of FORD MOTOR CO.
    • Does the voltage vary from approximately 0.95 volt with no tension applied to the sensor, to approximately 3.8 volts with full tension applied to the sensor? 
  13. Y13 CONFIRM THE OCSM FAULT 
    NOTE: Make sure all OCS components, restraint system sensor electrical connectors and the RCM electrical connectors are connected before carrying out self-test. If not, 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 in-line connectors) for pushed-out, 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 appropriate "OEM Connector Repair Procedures" for information.
    • 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 .
    • Enter the following diagnostic mode on the scan tool: Self Test - OCSM.
    • Enter the following diagnostic mode on the scan tool: DataLogger - OCSM - View and Record All 2909 Fault PIDs.
      • Refer to PID list in Normal Operation to view 2909 fault PIDs.
    • Does the original on-demand 2909 fault PID indicate a fault? 
    • Yes  : INSTALL a new OCS sensor. REFER to OCCUPANT CLASSIFICATION SENSOR . GO to  Y15.
    • No  : In the process of diagnosing the fault, the fault condition has become intermittent. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test  . GO to  Y14.
  14. Y14 CHECK FOR AN INTERMITTENT FAULT 
    • Ignition OFF.
    • Disconnect BTS C3238:
      • inspect connector(s) (including any in-line connectors) for 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 appropriate "OEM Connector Repair Procedures" for information.
    • Connect: All Previously Disconnected Component(s)/Connector(s).
    • Enter the following diagnostic mode on the scan tool: Self Test - OCSM.
    • Enter the following diagnostic mode on the scan tool: DataLogger - OCSM - View and Record All 2909 Fault PIDs.
      • Refer to PID list in Normal Operation to view 2909 fault PIDs.
    • Do any on-demand 2909 fault PIDs indicate a fault? 
    • Yes  : This is a hard fault. This fault cannot be cleared until it is corrected and the DTC is no longer retrieved on-demand during self-test.

      Using the on-demand fault PIDs recorded, GO to the appropriate pinpoint test step.

      For fault PID 2909_31_OD, GO to  Y2.

      For fault PID 2909_28_OD, GO to  Y8.

      For 2909_30_OD, GO to  Y9.

      For fault PID 2909_29_OD, GO to  Y10.

    • No  : CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition frequently. ACTIVATE other systems in the same wire harness. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test  . REPAIR any intermittent wiring, terminal or connector concerns found. Refer to appropriate "OEM Connector Repair Procedures" for information. GO to  Y15.
  15. Y15 CHECK FOR ADDITIONAL SRS DTCs 
    • 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.
    • 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.
    • Enter the following diagnostic mode on the scan tool: Self Test - Restraints.
      NOTE: When selecting Restraints from the Self Test menu, DTCs will be retrieved from the RCM and OCSM.
    • Are any RCM and/or OCSM DTCs retrieved? 
    • Yes  : Do not clear any DTCs until all DTCs have been resolved. GO to the DTC CHARTS  for pinpoint test direction.
    • No  : CLEAR all RCM and OCSM CMDTCs. PROVE OUT the SRS. The repair is complete. RETURN the vehicle to the customer.
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