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Home >> Ford >> 2009 >> Explorer 4.6 8, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 55 (Supplemental Restraint System) >> Diagnostic Tests >> Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Tests >> Pinpoint Test X: LFC 49/DTC C1981 - Front Driver's Seat Track Position Switch Circuit Fault >> Pinpoint Test X: LFC 49/DTC C1981 - Front Driver's Seat Track Position Switch Circuit Fault

Pinpoint Test X: LFC 49/DTC C1981 - Front Driver's Seat Track Position Switch Circuit Fault

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Remove restraint system diagnostic tools from the vehicle prior to road testing. If tools are not removed, the supplemental restraint system (SRS) device may not deploy in a crash. Failure to follow this instruction may result in serious personal injury or death in a crash and possibly violate vehicle safety standards.
WARNING: Never probe the electrical connectors on air bag, safety canopy or side air curtain modules. Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.
WARNING: Never probe the electrical connectors on safety belt buckle/retractor pretensioners or adaptive load limiting retractors. Failure to follow this instruction may result in the accidental deployment of the safety belt pretensioners or adaptive load limiting retractors, which increases the risk of serious 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.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
NOTE: 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: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
  1. X1 CHECK FOR CONTINUOUS AND ON-DEMAND DTCs 
    • Enter the following diagnostic mode on the diagnostic tool: Self Test - RCM
    • Was RCM on-demand DTC C1981 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.

      Go to  X2.

    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  X7.
  2. X2 CHECK CIRCUIT 1520 (LG) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Disconnect: Driver Seat Side Air Bag C367
    • Connect: Restraint System Diagnostic Tool 418-133 to Driver Seat Side Air Bag C367
    • Disconnect: Driver Seat Track Position Sensor C356
    • Disconnect: RCM C2041a and C2041b
    • Repower the SRS. Do not  prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Key in ON position.
      • Fig 1: Checking Circuit 1520 (LG) For A Short To Voltage
      GF0002210Courtesy of FORD MOTOR CO.
    • Measure the voltage between driver seat track position sensor C356-2, circuit 1520 (LG), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR circuit 1520 (LG). Go to  X8.
    2. NO  : Go to  X3.
  3. X3 CHECK CIRCUIT 1203 (BK/LB) FOR AN OPEN 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
      • Fig 2: Checking Circuit 1203 (BK/LB) For An Open
      GF0008834Courtesy of FORD MOTOR CO.
    • Measure the resistance between driver seat track position sensor C356-1, circuit 1203 (BK/LB), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  X4.
    2. NO  : REPAIR circuit 1203 (BK/LB). Go to  X8.
  4. X4 CHECK CIRCUIT 1520 (LG) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between RCM C2041b-23, circuit 1520 (LG), harness side and driver seat track position sensor C356-2, circuit 1520 (LG), harness side.
    • Is the resistance less than 0.5 ohm? 
    1. YES  : Go to  X5.
    2. NO  : REPAIR circuit 1520 (LG). Go to  X8.
  5. X5 CHECK THE SEAT TRACK POSITION SENSOR 
    1. YES  : Go to  X6.
    2. NO  : Fault corrected. Go to  X8.
  6. X6 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.
    1. YES  : INSTALL a new RCM. REFER to Restraints Control Module (RCM) . Go to  X8.
    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. 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. Go to  X8.
  7. X7 CHECK FOR AN INTERMITTENT FAULT 
    • Enter the following diagnostic mode on the diagnostic tool: Self Test - RCM
    • Was RCM on-demand DTC C1981 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.

      Go to  X2.

    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. 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. Go to  X8.
  8. X8 CHECK FOR ADDITIONAL SRS DTCs 
    • Key in OFF position.
      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).
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Self Test - RCM
    • Are any RCM DTCs retrieved indicating a fault? 
    1. YES  : Do not clear any DTCs until all DTCs have been resolved. Go to the Supplemental Restraint System (SRS) DTC Chart  for pinpoint test direction.
    2. NO  : CLEAR all RCM continuous memory DTCs. PROVE OUT the SRS. Repair is complete. RETURN the vehicle to the customer.
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