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Home >> Ford >> 2002 >> Taurus SES, 3.0 S >> Repair and Diagnosis >> External Pages >> Different car >> Section 2110 (Supplemental Inflatable Restraint System - F-150 & Mark LT) >> Diagnostic Tests >> Pinpoint Tests - Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Tests >> Pinpoint Test I: LFC 16/DTC B2290 - Occupant Classification System Fault >> Pinpoint Test I: LFC 16/DTC B2290 - Occupant Classification System Fault

Pinpoint Test I: LFC 16/DTC B2290 - Occupant Classification System Fault

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: To identify between a production OCS system and an OCS system service kit (OCS service kit), inspect the OCS ECU electrical connector.  

A production OCS system allows the disconnect of the electrical connector from the OCS ECU.

An OCS system service kit has the OCS ECU electrical connector glued to the ECU. It cannot and should not be disconnected or altered.

NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough Inspection and Verification before proceeding with the pinpoint test.
  1. I1 CHECK FOR A HARD OR INTERMITTENT DTC 
    WARNING: Restraint system diagnostic tools are for service only. Tools must be removed prior to operating the vehicle over the road. Failure to remove restraint system diagnostic tools could result in injury and possible violation of vehicle safety standards.
    WARNING: Never probe the connectors on the air bag module. Doing so can result in air bag deployment, which can result in personal injury.
    WARNING: The safety belt pretensioner is a pyrotechnic device. Always wear safety glasses when repairing an air bag equipped vehicle and when handling a safety belt buckle pretensioner or safety belt retractor pretensioner. Never probe a pretensioner electrical connector. Doing so could result in pretensioner or air bag deployment and could result in personal injury.
    NOTE: After diagnosing or repairing an SRS, the restraint system diagnostic tools must be removed before operating the vehicle over the road. 
    NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
    • Enter the following diagnostic mode on the diagnostic tool: On-Demand Self Test/Retrieve and Record Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: View and Record DTC B2290 Fault PIDs
    • Was on-demand DTC B2290 retrieved? 
    1. YES  : This is a hard fault. The fault condition is still present. This fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the on-demand self test.

      Using the fault PIDs recorded, go to the appropriate pinpoint test step.

      Vehicles with a production OCS system 

      For OCS system with a communications fault, go to  I2 .

      For OCS system with a pressure sensor fault, go to  I11 .

      For OCS system with a calibration fault, go to  I25 .

      For OCS system with an internal fault, go to  I26 .

      Vehicles with a service OCS system 

      For OCS system with a communications fault, go to  I19 .

      For OCS system with a calibration fault, go to  I25 .

      For OCS system with an internal fault, go to  I26 .

      For OCS system with a pressure sensor fault, INSPECT the seat wiring harness for damage and REPAIR as needed. If OK, INSTALL a new OCS system service kit. Refer to Occupant Classification Sensor  in this section. Go to  I28 .

    2. NO  : This is an intermittent fault when present as a continuous memory DTC only (DTC not retrieved on-demand). The fault condition is not present at this time. Go to  I27 .
  2. I2 CHECK THE SEAT WIRING AND CONNECTORS 
    • Key in OFF position.
    • Depower the system. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Carry out a thorough visual inspection of the OCS system wiring, terminals and connectors, the RCM wiring and terminals and connectors at C310b pins 17 and 18, and the related seat wiring harness and body wiring harness terminals and connectors.
    • Were any problems noted? 
    1. YES  : REPAIR the seat connectors and wiring as needed. Go to  I28 .
    2. NO  : Go to  I3.
  3. I3 CHECK IGNITION CIRCUIT 937 (RD/WH) FOR AN OPEN 
    • Key in OFF position.
    • Depower the system. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Disconnect: Passenger Safety Belt Buckle Pretensioner C3202
    • Connect: Restraint System Diagnostic Tool 418-F395 to Passenger Safety Belt Buckle Pretensioner C3202
    • Disconnect: OCS ECU C3043
    • Repower the system. Do not  prove out the system at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Key in ON position.
    • Measure the voltage between OCS ECU C3043-1, circuit 937 (RD/WH), harness side and ground.
      • Fig 1: Measuring Voltage Between OCS ECU C3043 Pin 1, Circuit 937 (RD/WH), Harness Side And Ground
      GF0002147Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  I4.
    2. NO  : REPAIR circuit 937 (RD/WH). Go to  I28 .
  4. I4 CHECK GROUND CIRCUIT 1203 (BK/LB) FOR AN OPEN 
    • Key in OFF position.
    • Depower the system. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Measure the resistance between OCS ECU C3043-14, circuit 1203 (BK/LB), harness side and ground.
      • Fig 2: Measuring Resistance Between OCS ECU C3043 Pin 14, Circuit 676 (PK/OG), Harness Side And Ground
      GF0002148Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  I5.
    2. NO  : REPAIR circuit 1203 (BK/LB). Go to  I28 .
  5. I5 CHECK CIRCUITS 1918 (BN/WH) AND 1919 (PK/OG) FOR A SHORT TO VOLTAGE BETWEEN THE OCS AND THE RCM 
    • Disconnect: RCM C310a and C310b
    • Repower the system. Do not  prove out the system at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Key in ON position.
    • Measure the voltage between OCS ECU C3043-18, circuit 1918 (BN/WH), harness side and ground; and between OCS ECU 3043-9, circuit 1919 (PK/OG), harness side and ground.
      • Fig 3: Measuring Voltage Between OCS ECU C3043 Pin 18, Circuit 1918 (BN/WH), Harness Side And Ground; And Between OCS ECU C3043 Pin 9, Circuit 1919 (PK/OG), Harness Side And Ground
      GF0002149Courtesy of FORD MOTOR CO.
    • Are the voltages less than 0.2 volt? 
    1. YES  : Go to  I6.
    2. NO  : REPAIR circuit 1918 (BN/WH) or circuit 1919 (PK/OG). Go to  I28 .
  6. I6 CHECK CIRCUITS 1918 (BN/WH) AND 1919 (PK/OG) FOR A SHORT TO GROUND BETWEEN THE OCS AND THE RCM 
    • Key in OFF position.
    • Depower the system. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Measure the resistance between OCS ECU C3043-18, circuit 1918 (BN/WH), harness side and ground; and between OCS ECU C3043-9, circuit 1919 (PK/OG), harness side and ground.
      • Fig 4: Measuring Resistance Between OCS ECU C3043 Pin 18, Circuit 1918 (BN/WH), Harness Side And Ground; And Between OCS ECU C3043 Pin 9, Circuit 1919 (PK/OG), Harness Side And Ground
      GF0002150Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 1,000,000 ohms? 
    1. YES  : Go to  I7.
    2. NO  : REPAIR circuit 1918 (BN/WH) or circuit 1919 (PK/OG). Go to  I28 .
  7. I7 CHECK CIRCUIT 1918 (BN/WH) FOR AN OPEN BETWEEN THE OCS AND THE RCM 
    • Measure the resistance between RCM C310b-17, circuit 1918 (BN/WH), harness side and OCS ECU C3043-18, circuit 1918 (BN/WH), harness side.
      • Fig 5: Measuring Resistance Between RCM C310b-17, Circuit 1918 (BN/WH), Harness Side And OCS ECU C3043-18, Circuit 1918 (BN/WH), Harness Side
      GF0002151Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohm? 
    1. YES  : Go to  I8.
    2. NO  : REPAIR circuit 1918 (BN/WH). Go to  I28 .
  8. I8 CHECK CIRCUIT 1919 (PK/OG) FOR AN OPEN BETWEEN THE OCS AND THE RCM 
    • Measure the resistance between RCM C310b-18, circuit 1919 (PK/OG), harness side and OCS ECU C3043-9, circuit 1919 (PK/OG), harness side.
      • Fig 6: Measuring Resistance Between RCM C310b-18, Circuit 1919 (PK/OG), Harness Side And OCS ECU C3043-9, Circuit 1919 (PK/OG), Harness side
      GF0002152Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohm? 
    1. YES  : Go to  I9.
    2. NO  : REPAIR circuit 1919 (PK/OG). Go to  I28 .
  9. I9 CHECK CIRCUIT 1918 (BN/WH) FOR A SHORT TO CIRCUIT 1919 (PK/OG) BETWEEN THE OCS AND THE RCM 
    • Measure the resistance between RCM C310b-17, circuit 1918 (BN/WH), harness side and RCM C310b-18, circuit 1919 (PK/OG), harness side.
      • Fig 7: Measuring Resistance Between RCM C310b-17, Circuit 1918 (BN/WH), Harness Side And RCM C310b-18, Circuit 1919 (PK/OG), Harness Side
      GF0002153Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 1,000,000 ohms? 
    1. YES  : Go to  I10.
    2. NO  : REPAIR circuits 1918 (BN/WH) and 1919 (PK/OG). Go to  I28 .
  10. I10 CHECK THE OCS 
    NOTE: Make sure all restraint system diagnostic tools, sensor electrical connectors and the RCM electrical connector are connected before carrying out the on-demand self test. If not, erroneous DTCs will be recorded.
    • Install a known good RCM. Refer to Restraints Control Module (RCM)  in this article.
    • Connect: OCS ECU C3043
    • Repower the system. Do not  prove out the system at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Enter the following diagnostic mode on the diagnostic tool: On-Demand Self Test/Retrieve and Record Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: View and Record DTC B2290 Fault PIDs
    • Was on-demand DTC B2290 retrieved? 
    1. YES  : INSTALL an OCS system service kit. Refer to Occupant Classification Sensor  in this article. Go to  I28 .
    2. NO  : Fault corrected. Go to  I28 .
  11. I11 CHECK THE SEAT WIRING AND CONNECTORS 
    • Key in OFF position.
    • Depower the system. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Carry out a thorough visual inspection of the OCS system wiring, terminals and connectors and the related seat wiring harness and body wiring harness terminals and connectors.
    • Were any problems noted? 
    1. YES  : REPAIR the seat connectors and wiring as needed. Go to  I28 .
    2. NO  : Go to  I12.
  12. I12 CHECK CIRCUITS 1568 (RD/WH), 1569 (GY/LB) AND 1570 (TN/BK) FOR A SHORT TO VOLTAGE 
    • Disconnect: Passenger Safety Belt Buckle Pretensioner C3202
    • Connect: Restraint System Diagnostic Tool 418-F395 to Passenger Safety Belt Buckle Pretensioner C3202
    • Disconnect: RCM C310a and C310b
    • Disconnect: OCS Pressure Sensor C3042
    • Disconnect: OCS ECU C3043
    • Repower the system. Do not  prove out the system at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Key in ON position.
    • Measure the voltage between OCS pressure sensor C3042-1, circuit 1568 (RD/WH), harness side and ground; between OCS pressure sensor C3042-2, circuit 1570 (TN/BK), harness side and ground; and between OCS pressure sensor C3042-3, circuit 1569 (GY/LB), harness side and ground.
      • Fig 8: Checking Circuits 1568 (RD/WH), 1569 (GY/LB) And 1570 (TN/BK) For Short To Voltage
      G04675845Courtesy of FORD MOTOR CO.
    • Are the voltages less than 0.2 volt? 
    1. YES  : Go to  I13.
    2. NO  : REPAIR circuit 1568 (RD/WH), circuit 1569 (GY/LB) or circuit 1570 (TN/BK). Go to  I28 .
  13. I13 CHECK CIRCUITS 1568 (RD/WH), 1569 (GY/LB) AND 1570 (TN/BK) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Depower the system. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Measure the resistance between OCS pressure sensor C3042-1, circuit 1568 (RD/WH), harness side and ground; between OCS pressure sensor C3042-2, circuit 1570 (TN/BK), harness side and ground; and between OCS pressure sensor C3042-3, circuit 1569 (GY/LB), harness side and ground.
      • Fig 9: Checking Circuits 1568 (RD/WH), 1569 (GY/LB) And 1570 (TN/BK) For Short To Voltage
      G04675845Courtesy of FORD MOTOR CO.
    • Are the voltages less than 0.2 volt? 
    • Are the resistances greater than 1,000,000 ohms? 
    1. YES  : Go to  I14.
    2. NO  : REPAIR circuit 1568 (RD/WH), circuit 1569 (GY/LB) or circuit 1570 (TN/BK). Go to  I28 .
  14. I14 CHECK CIRCUIT 1568 (RD/WH) FOR AN OPEN BETWEEN THE OCS ECU AND PRESSURE SENSOR 
    • Measure the resistance between OCS ECU C3043-3, circuit 1568 (RD/WH), harness side and OCS pressure sensor C3159 Pin 1, circuit 1568 (RD/WH), harness side.
      • Fig 10: Measuring Resistance Between OCS ECU C3043 Pin 3, Circuit 1568 (RD/WH) And OCS Pressure Sensor C3159 Pin 1, Circuit 1568 (RD/WH)
      GF0002154Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohm? 
    1. YES  : Go to  I15.
    2. NO  : REPAIR circuit 1568 (RD/WH). Go to  I28 .
  15. I15 CHECK CIRCUIT 1569 (GY/LB) FOR AN OPEN BETWEEN THE OCS ECU AND PRESSURE SENSOR 
    • Measure the resistance between OCS ECU C3043-5, circuit 1569 (GY/LB), harness side and OCS pressure sensor C3042-3, circuit 1569 (GY/LB), harness side.
      • Fig 11: Measuring Resistance Between OCS ECU C3043 Pin 5, Circuit 1569 (GY/DB) And OCS Pressure Sensor C3042-3, Circuit 1569 (GY/DB)
      GF0002155Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohm? 
    1. YES  : Go to  I16.
    2. NO  : REPAIR circuit 1569 (GY/LB). Go to  I28 .
  16. I16 CHECK CIRCUIT 1570 (TN/BK) FOR AN OPEN BETWEEN THE OCS ECU AND PRESSURE SENSOR 
    • Measure the resistance between OCS ECU C3043-4, circuit 1570 (TN/BK), harness side and OCS pressure sensor C3042-2, circuit 1570 (TN/BK), harness side.
      • Fig 12: Measuring Resistance Between OCS ECU C3043 Pin 4, Circuit 1570 (TN/BK) And OCS Pressure Sensor C3042-2, Circuit 1570 (TN/BK), Harness Side
      GF0002156Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohm? 
    1. YES  : Go to  I17.
    2. NO  : REPAIR circuit 1570 (TN/BK). Go to  I28 .
  17. I17 CHECK CIRCUITS 1568 (RD/WH), 1569 (GY/LB) AND 1570 (TN/BK) FOR A SHORT 
    • Measure the resistance between the OCS pressure sensor:
      • C3042-1, circuit 1568 (RD/WH), harness side and C3042-2, circuit 1570 (TN/BK), harness side.
      • C3042-1, circuit 1568 (RD/WH), harness side and C3042-3, circuit 1569 (GY/LB), harness side.
      • C3042-2, circuit 1570 (TN/BK), harness side and C3042-3, circuit 1569 (GY/LB), harness side.
      • Fig 13: Measuring Resistance Between Connector Terminals
      GF0002157Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 1,000,000 ohms? 
    1. YES  : Go to  I18.
    2. NO  : REPAIR circuit 1568 (RD/WH), circuit 1569 (GY/LB) and/or circuit 1570 (TN/BK). Go to  I28 .
  18. I18 CHECK OCS SYSTEM 
    NOTE: Make sure all restraint system diagnostic tools, sensor electrical connectors and the RCM electrical connector are connected before carrying out the on-demand self test. If not, erroneous DTCs will be recorded.
    • Install a new OCS system service kit. Refer to Occupant Classification Sensor  in this article.
    • Connect: RCM C310a and C310b
    • Repower the system. Do not  prove out the system at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: OCS System Reset
      • CAUTION: It is necessary to carry out the OCS system reset when a front passenger seat cushion is disassembled, a new trim cover installed or an OCS service kit is installed. A scan tool is used to trigger the active command to carry out the OCS system reset.
      CAUTION: Make sure the seat is completely assembled before carrying out the OCS system reset.
      CAUTION: The following precautions must be taken before carrying out the OCS system reset active command:
      • Make sure the OCS system components are connected and no faults are present.
      • Make sure the OCS system is not at a temperature below 0°C (32°F) or above 45°C (113°F) when initiating the OCS system reset process. If the vehicle has been exposed to extreme cold or hot temperatures, the vehicle must be exposed and kept at a temperature within the limits, 0°C to 45°C (32°F to 113°F) for a minimum of 30 minutes.
      • Make sure nothing is present on the passenger seat before carrying out the OCS system reset and nothing is placed on the seat during the process.
      • Make sure a minimum 8-second time period has passed after cycling the ignition switch ON before carrying out the OCS system reset process.
      NOTE: For best results, the OCS system should be at or near room temperature, 10°C to 29°C (50°F to 85°F).
      NOTE: If the first attempt to carry out the OCS system reset is unsuccessful, a second attempt must be made.
    • Carry out the OCS system reset active command using the scan tool.
    • Key in OFF position.
      NOTE: The ignition switch must be cycled after the OCS system reset.
    • Enter the following diagnostic mode on the diagnostic tool: On-Demand Self Test/Retrieve and Record Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: View and Record DTC B2290 Fault PIDs
    • Was on-demand DTC B2290 retrieved? 
    1. YES  : INSTALL a new RCM. Refer to Restraints Control Module (RCM)  in this article. Go to  I28 .
    2. NO  : Fault corrected. Go to  I28 .
  19. I19 CHECK THE SEAT WIRING AND CONNECTORS 
    • Key in OFF position.
    • Depower the system. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Carry out a thorough visual inspection of the OCS system wiring, terminals and connectors, the RCM wiring and terminals and connectors at C310b pins 17 and 18, and the related seat wiring harness and body wiring harness terminals and connectors.
    • Were any problems noted? 
    1. YES  : REPAIR the seat connectors and wiring as needed. Go to  I28 .
    2. NO  : Go to  I20.
  20. I20 CHECK IGNITION CIRCUIT 937 (RD/WH) FOR AN OPEN 
    • Key in OFF position.
    • Depower the system. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Disconnect: Passenger Safety Belt Buckle Pretensioner C3202
    • Connect: Restraint System Diagnostic Tool 418-F395 to Passenger Safety Belt Buckle Pretensioner C3202
    • Disconnect: Passenger Seat C3205
    • Repower the system. Do not  prove out the system at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Key in ON position.
    • Measure the voltage between passenger seat C3205-10, circuit 937 (RD/WH), harness side and ground.
      • Fig 14: Measuring Voltage Between Passenger Seat C3205 Pin 10, Circuit 937 (RD/WH), Harness Side And Ground
      GF0002158Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  I21.
    2. NO  : REPAIR circuit 937 (RD/WH). Go to  I28 .
  21. I21 CHECK GROUND CIRCUIT 1203 (BK/LB) FOR AN OPEN 
    • Key in OFF position.
    • Depower the system. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Measure the resistance between passenger seat C3205-11, circuit 1203 (BK/LB), harness side and ground.
      • Fig 15: Measuring Resistance Between Passenger Seat C3205 Pin 11, Circuit 1203 (BK/LB), Harness Side And Ground
      GF0002159Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  I22.
    2. NO  : REPAIR circuit 1203 (BK/LB). Go to  I28 .
  22. I22 CHECK CIRCUITS 1918 (BN/WH) AND 1919 (PK/OG) FOR A SHORT TO VOLTAGE BETWEEN THE PASSENGER SEAT AND THE RCM 
    • Disconnect: RCM C310a and C310b
    • Repower the system. Do not  prove out the system at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Key in ON position.
    • Measure the voltage between passenger seat C3205-9, circuit 1918 (BN/WH), harness side and ground; and between passenger seat 3205-8, circuit 1919 (PK/OG), harness side and ground.
      • Fig 16: Checking Circuits 1918 (BN/WH) And 1919 (PK/OG) For Short To Voltage Between Passenger Seat And RCM
      GF0002160Courtesy of FORD MOTOR CO.
    • Are the voltages less than 0.2 volt? 
    1. YES  : Go to  I23.
    2. NO  : REPAIR circuit 1918 (BN/WH) or circuit 1919 (PK/OG). Go to  I28 .
  23. I23 CHECK CIRCUITS 1918 (BN/WH) AND 1919 (PK/OG) FOR A SHORT TO GROUND BETWEEN THE PASSENGER SEAT AND THE RCM 
    • Key in OFF position.
    • Depower the system. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Measure the resistance between passenger seat C3205-9, circuit 1918 (BN/WH), harness side and ground; and between passenger seat C3205-8, circuit 1919 (PK/OG), harness side and ground.
      • Fig 17: Checking Circuits 1918 (BN/WH) And 1919 (PK/OG) For Short To Ground Between Passenger Seat And RCM
      GF0002161Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 1,000,000 ohms? 
    1. YES  : Go to  I24.
    2. NO  : REPAIR circuit 1918 (BN/WH) or circuit 1919 (PK/OG). Go to  I28 .
  24. I24 CHECK CIRCUIT 1918 (BN/WH) AND CIRCUIT 1919 (PK/OG) FOR AN OPEN BETWEEN THE PASSENGER SEAT AND THE RCM 
    • Measure the resistance between RCM C310b-17, circuit 1918 (BN/WH), harness side and passenger seat C3205-9, circuit 1918 (BN/WH), harness side; and between RCM C310b-18, circuit 1919 (PK/OG), harness side and passenger seat C3205-8, circuit 1919 (PK/OG), harness side.
      • Fig 18: Checking Circuit 1918 (BN/WH) And Circuit 1919 (PK/OG) For An Open Between Passenger Seat And RCM
      GF0002162Courtesy of FORD MOTOR CO.
    • Are the resistances less than 0.5 ohm? 
    1. YES  : Go to  I25.
    2. NO  : REPAIR circuit 1918 (BN/WH) or circuit 1919 (PK/OG). Go to  I28 .
  25. I25 CHECK OCS SYSTEM 
    NOTE: Make sure all restraint system diagnostic tools, sensor electrical connectors and the RCM electrical connector are connected before carrying out the on-demand self test. If not, erroneous DTCs will be recorded.
    • Key in OFF position.
    • Enter the following diagnostic mode on the diagnostic tool: OCS System Reset
      • CAUTION: It is necessary to carry out the OCS system reset when a front passenger seat cushion is disassembled, a new trim cover installed or an OCS service kit is installed. A scan tool is used to trigger the active command to carry out the OCS system reset.
      CAUTION: Make sure the seat is completely assembled before carrying out the OCS system reset.
      CAUTION: The following precautions must be taken before carrying out the OCS system reset:
      • Make sure the OCS system components are connected and no faults are present.
      • Make sure the OCS system is not at a temperature below 0°C (32°F) or above 45°C (113°F) when initiating the OCS system reset process. If the vehicle has been exposed to extreme cold or hot temperatures, the vehicle must be exposed and kept at a temperature within the limits, 0°C to 45°C (32°F to 113°F) for a minimum of 30 minutes.
      • Make sure nothing is present on the passenger seat before carrying out the OCS system reset and nothing is placed on the seat during the process.
      • Make sure a minimum 8-second time period has passed after cycling the ignition switch ON before carrying out the OCS system reset process.
      NOTE: For best results, the OCS system should be at or near room temperature, 10°C to 29°C (50°F to 85°F).
      NOTE: If the first attempt to carry out the OCS system reset is unsuccessful, a second attempt must be made.
    • Carry out the OCS system reset using the scan tool.
    • Key in OFF position.
      NOTE: The ignition switch must be cycled after the OCS system reset.
    • Enter the following diagnostic mode on the diagnostic tool: On-Demand Self Test/Retrieve and Record Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: View and Record DTC B2290 Fault PIDs
    • Was on-demand DTC B2290 retrieved? 
    1. YES  : INSTALL a new OCS system service kit. Refer to Occupant Classification Sensor  in this article. Go to  I28 .
    2. NO  : Fault corrected. Go to  I28 .
  26. I26 CHECK FOR AN OCS MOUNTING FAULT 
    • Key in OFF position.
    • Depower the system. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Inspect the OCS ECU for correct mounting location and direction, that the OCS fasteners are tight, no damage to the OCS ECU and no damage to the seat cushion pan.
    • Is the OCS ECU correctly located, are the fasteners tight and is there no damage to components? 
    1. YES  : INSTALL a new OCS system service kit. Refer to Occupant Classification Sensor  in this article. Go to  I28 .
    2. NO  : REPAIR as necessary. Refer to Occupant Classification Sensor  in this article. Go to  I28 .
  27. I27 CHECK FOR AN INTERMITTENT FAULT 
    • Key in OFF position.
    • Enter the following diagnostic mode on the diagnostic tool: On-Demand Self Test/Retrieve and Record Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: View and Record DTC B2290 Fault PIDs
    • Was on-demand DTC B2290 retrieved? 
    1. YES  : This is a hard fault. The fault condition is now present. This fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the on-demand self test.

      Using the fault PIDs recorded, go to the appropriate pinpoint test step.

      Vehicles with a production OCS system 

      For OCS system with a communications fault, go to  I2 .

      For OCS system with a calibration fault, go to  I25 .

      For OCS system with an internal fault, go to  I26 .

      For OCS system with a pressure sensor fault, go to  I11 .

      Vehicles with a service OCS system 

      For OCS system with a communications fault, go to  I19 .

      For OCS system with a calibration fault, go to  I25 .

      For OCS system with an internal fault, go to  I26 .

      For OCS system with a pressure sensor fault, INSPECT the seat wiring harness for damage and REPAIR as needed. If OK, INSTALL a new OCS system service kit. Refer to Occupant Classification Sensor  in this section. Go to  I28 .

    2. NO  : CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. ACTIVATE other systems in the same wire harness. REPAIR any intermittent concerns found. Go to  I28 .
  28. I28 CHECK FOR ADDITIONAL DTCs 
    • Refer to the continuous memory DTCs recorded during Step I1.
    • Were any continuous memory DTCs retrieved during Step I1? 
    1. YES  : Do not clear any DTCs until all DTCs have been resolved. Go to the Restraints Control Module (RCM) Diagnostic Trouble Code (DTC) Table in this article for pinpoint test direction.
    2. NO  : RECONNECT the system. If previously directed to deactivate the system, REACTIVATE the system. REFER to Supplemental Restraint System (SRS) Deactivation and Reactivation  in this article. REPOWER the system. REFER to Supplemental Restraint System (SRS) Depowering and Repowering  in this article. PROVE OUT the system. CLEAR all DTCs.
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