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Home >> Ford >> 2005 >> Focus ZX5 S, Automatic >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Supplemental Inflatable Restraint System >> Diagnosis And Testing >> Pinpoint Tests - Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Test BN: DTC U2018 - Passenger Side Crash Sensor Communication Fault >> Pinpoint Test Bn: DTC U2018 - Passenger Side Crash Sensor Communication Fault

Pinpoint Test Bn: DTC U2018 - Passenger Side Crash Sensor Communication Fault

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. BN1 CHECK FOR CONTINUOUS AND ON-DEMAND DTCs 
    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 scan tool: On-Demand Self Test.
    • Enter the following diagnostic mode on the scan tool: Retrieve/Record Continuous DTCs.
    • Was DTC U2018 retrieved during the on-demand self test? 
    • 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.

      GO to  BN2.

    • No  : This is an intermittent fault. The fault condition is not present at this time. GO to  BN13.
  2. BN2 INSPECT THE PASSENGER SIDE IMPACT SENSOR MOUNTING SURFACE 
    • Key in OFF position.
    • Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Inspect the passenger side impact sensor mounting and make sure that the retaining bolts are fully seated and tightened correctly.
    • Remove the passenger side impact sensor. Refer to SIDE IMPACT SENSOR .
    • Visually inspect the passenger side impact sensor and mounting surface for damage, corrosion or dirt.
    • Was a significant amount of corrosion or dirt found, the passenger side impact sensor attached to the mounting surface incorrectly or were the passenger side impact sensor mounting bolts not fully seated and tightened correctly? 
    • Yes  : CLEAN and TIGHTEN the bolts or REPAIR the mounting surface as necessary. REINSTALL the passenger side impact sensor. Go to  BN14.
    • No  : GO to  BN3.
  3. BN3 INSTALL THE PASSENGER SIDE IMPACT SENSOR AND CARRY OUT THE ON-DEMAND SELF TEST 
    • Clean and repair the mounting surface as necessary.
    • Clean the passenger side impact sensor mounting bolts.
    • Install the passenger side impact sensor. Refer to SIDE IMPACT SENSOR .
    • Repower the system. Do not  prove out the system at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
    • Was DTC U2018 retrieved during the on-demand self test? 
    • Yes  : GO to  BN4.
    • No  : Fault corrected. Go to  BN14.
  4. BN4 CHECK THE PASSENGER SIDE IMPACT SENSOR GROUND CIRCUIT 9-JA40 (BN/WH) FOR HIGH RESISTANCE 
    • Key in OFF position.
    • Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Passenger Side Impact Sensor C304.
    • Measure the resistance between passenger side impact sensor C304 pin 1, circuit 9-JA40 (BN/WH), harness side and the front impact severity sensor case ground.
    • Is the resistance less than 10 ohms? 
    • Yes  : GO to  BN6.
    • No  : GO to  BN5.
  5. BN5 CLEAN THE PASSENGER SIDE IMPACT SENSOR MOUNTING SURFACE AND CARRY OUT THE ON-DEMAND SELF TEST 
    • Remove the passenger side impact sensor. Refer to SIDE IMPACT SENSOR .
    • Clean and repair the mounting surface as necessary.
    • Clean the passenger side impact sensor mounting bolts.
    • Install the passenger side impact sensor. Refer to SIDE IMPACT SENSOR .
    • Repower the system. Do not  prove out the system at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
    • Was DTC U2018 retrieved during the on-demand self test? 
    • Yes  : GO to  BN6.
    • No  : Fault corrected. Go to  BN14.
  6. BN6 CHECK CIRCUIT 8-JA40 (WH/VT) AND CIRCUIT 9-JA40 (BN/WH) FOR A SHORT TO VOLTAGE BETWEEN THE RCM AND THE PASSENGER SIDE IMPACT SENSOR 
    • Key in OFF position.
    • Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: RCM C2041a and C2041b.
    • Disconnect: Passenger Side Impact Sensor C304.
    • Repower the system. Do not  prove out the system at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Key in ON position.
    • Measure the voltage between passenger side impact sensor C304 pin 2, circuit 8-JA40 (WH/VT), harness side and ground; and between passenger impact sensor C304 pin 1, circuit 9-JA40 (BN/WH), harness side and ground.
      Fig 1: Measuring Voltage Between Connector Terminals And Ground
      G03953516Courtesy of FORD MOTOR CO.
    • Are the voltages less than 0.2 volt? 
    • Yes  : GO to  BN7.
    • No  : REPAIR circuit 8-JA40 (WH/VT) or circuit 9-JA40 (BN/VT). Go to  BN14.
  7. BN7 CHECK CIRCUIT 8-JA40 (WH/VT) AND CIRCUIT 9-JA40 (BN/WH) FOR A SHORT TO GROUND BETWEEN THE RCM AND THE PASSENGER SIDE IMPACT SENSOR 
    • Key in OFF position.
    • Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Measure the resistance between passenger side impact sensor C304 pin 2, circuit 8-JA40 (WH/VT), harness side and ground; and between passenger impact sensor C304 pin 1, circuit 9-JA40 (BN/WH), harness side and ground.
      Fig 2: Checking Circuit 8-JA40 (WH/VT) And Circuit 9-JA40 (BN/WH) For Short To Ground Between RCM And Passenger Side Impact Sensor
      G03953534Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 1,000,000 ohms? 
    • Yes  : GO to  BN8.
    • No  : REPAIR circuit 8-JA40 (WH/VT) or circuit 9-JA40 (BN/WH). Go to  BN14.
  8. BN8 CHECK CIRCUIT 8-JA40 (WH/VT) FOR AN OPEN BETWEEN THE RCM AND THE PASSENGER SIDE IMPACT SENSOR 
    • Measure the resistance between RCM C2041a pin 29, circuit 8-JA40 (WH/VT), harness side and driver side impact sensor C304 pin 2, circuit 8-JA40 (WH/VT), harness side.
      Fig 3: Checking Circuit 8-JA40 (WH/VT) For An Open Between RCM And Passenger Side Impact Sensor
      G03953540Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohm? 
    • Yes  : GO to  BN9.
    • No  : REPAIR circuit 8-JA40 (WH/VT). Go to  BN14.
  9. BN9 CHECK CIRCUIT 9-JA40 (BN/WH) FOR AN OPEN BETWEEN THE RCM AND THE PASSENGER SIDE IMPACT SENSOR 
    • Measure the resistance between RCM C2041a pin 28, circuit 9-JA40 (BN/WH), harness side and passenger side impact sensor C304 pin 1, circuit 9-JA40 (BN/WH), harness side.
      Fig 4: Measuring Resistance Between RCM C2041a Pin 28 And Passenger Side Impact Sensor C304 Pin 1
      G03953541Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohm? 
    • Yes  : GO to  BN10.
    • No  : REPAIR circuit 9-JA40 (BN/WH). Go to  BN14.
  10. BN10 CHECK CIRCUIT 8-JA40 (WH/VT) FOR A SHORT TO CIRCUIT 9-JA40 (BN/WH) BETWEEN THE RCM AND THE PASSENGER SIDE IMPACT SENSOR 
    • Checking Circuit 8-JA40 (WH/VT) For A Short To Circuit 9-JA40 (BN/WH) Between RCM And Passenger Side Impact Sensor
      Fig 5: Measuring Resistance Between Connector Terminals
      G03953481Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 1,000,000 ohms? 
    • Yes  : GO to  BN11.
    • No  : REPAIR circuit 8-JA40 (WH/VT) and circuit 9-JA40 (BN/WH). Go to  BN14.
  11. BN11 CHECK THE PASSENGER SIDE IMPACT SENSOR 
    • Connect: RCM C2041a and C2041b.
    • Install a known good passenger side impact sensor.
    • Repower the system. Do not  prove out the system at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
    • Was DTC U2018 retrieved during the on-demand self test? 
    • Yes  : GO to  BN12.
    • No  : Fault corrected. Go to  BN14.
  12. BN12 CONFIRM THE RCM FAULT 
    NOTE: Make sure all restraint system diagnostic tools, sensor electrical connectors, and the RCM electrical connectors are connected before carrying out the on-demand self test. If not, erroneous DTCs will be recorded.
    • Yes  : INSTALL and CONFIGURE a new RCM. Refer to RESTRAINTS CONTROL MODULE (RCM) . Go to  BN14.
    • 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. REPAIR any intermittent concerns found. GO to  BN14.
  13. BN13 CHECK FOR AN INTERMITTENT FAULT 
    • Key in OFF position.
    • Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
    • Was DTC U2018 retrieved during the on-demand self test? 
    • 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. GO to  BN2.
    • 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. REPAIR any intermittent concerns found. Go to  BN14.
  14. BN14 CHECK FOR ADDITIONAL DTCs 
    • refer to the continuous DTCs recorded during Step  BN1.
    • Were any continuous DTCs retrieved during Step BN1? 
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