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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1110 (Supplemental Inflatable Restraint System) >> Diagnosis And Testing >> Pinpoint Tests - Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Test AK: LFC 51/DTC C1981 - Front Drivers Seat Track Position Sensor Circuit Fault >> Testing

Pinpoint Test AK: LFC 51/DTC C1981 - Front Drivers Seat Track Position Sensor Circuit Fault: Testing

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
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. AK1 CHECK FOR CONTINUOUS OR 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: Do not handle, move or change the original horizontal mounting position of the restraints control module (RCM) while the RCM is connected and the ignition switch is ON. Failure to follow these instructions may result in the inadvertent deployment of the safety canopy and risk of personal injury.
    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.
    WARNING: Never probe the electrical connector on a safety canopy module. Doing so can result in safety canopy deployment.
    NOTE: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered.
    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 C1981 retrieved during the on-demand self test? 
    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. GO to AK2.
    2. No  : This is an intermittent fault. The fault condition is not present at this time. GO to  AK6.
  2. AK2 CHECK CIRCUIT 1520 (LG) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Driver Seat Side Air Bag Module C3226 (Vehicles with seat side air bag modules).
    • Connect: Restraint System Diagnostic Tool 418-133 to Driver Seat Side Air Bag Module C3226 (Vehicles with seat side air bag modules).
    • Disconnect: RCM C310a and C310b.
    • Disconnect: Seat Track Position Sensor C356.
    • 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 driver seat track position sensor C356 pin 2, circuit 1520 (LG), harness side and ground.
      Fig 1: Measuring Voltage Between Driver Seat Track Position Sensor Harness Side And Ground
      G03903770Courtesy of FORD MOTOR CO.
    • Is the voltage less than 0.2 volt? 
    1. Yes  : GO to AK3.
    2. No  : REPAIR circuit 1520 (LG). GO to  AK7.
  3. AK3 CHECK CIRCUIT 1520 (LG) FOR AN OPEN 
    • Key in OFF position.
    • Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Measure the resistance between RCM C310b pin 23, circuit 1520 (LG), harness side and driver seat track position sensor C356 pin 2, circuit 1520 (LG), harness side.
      Fig 2: Measuring Resistance Between RCM Connector And Seat Connector
      G03987379Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohm? 
    1. Yes  : GO to AK4.
    2. No  : REPAIR circuit 1520 (LG). GO to  AK7.
  4. AK4 CHECK CIRCUIT 1203 (BK/LB) FOR AN OPEN 
    • Measure the resistance between driver seat track position sensor C356 pin 1, circuit 1203 (BK/LB), harness side and ground.
      Fig 3: Measuring Resistance Between Driver Seat Track Position Sensor C356 Pin 1, Circuit 1203 (BK/LB), Harness Side And Ground
      G03903769Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohm? 
    1. Yes  : GO to AK5.
    2. No  : REPAIR circuit 1203 (BK/LB). GO to  AK7.
  5. AK5 CONFIRM THE RCM FAULT 
    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.
    • Connect: RCM C310a and C310b.
    • Connect: Seat Track Position Sensor C356.
    • 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 C1981 retrieved during the on-demand self test? 
    1. Yes  : INSTALL a new RCM. REFER to RESTRAINTS CONTROL MODULE (RCM) . GO to  AK7.
    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. REPAIR any intermittent concerns found. GO to  AK7.
  6. AK6 CHECK FOR AN INTERMITTENT FAULT 
    1. Yes  : GO to  AK2.
    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. REPAIR any intermittent concerns found. GO to AK7.
  7. AK7 CHECK FOR ADDITIONAL DTCs 
    • Refer to the continuous DTCs recorded during Step  AK1.
    • Were any continuous DTCs retrieved during Step   AK1 ? 
    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  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 . REPOWER the system. REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING . PROVE OUT the system. CLEAR all DTCs.
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